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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=p22gyRo0wnxYzwukKoFNrLNrcfjLktz7j2+ydITrC7GjgyxoHtFXM4BkMRXLegGlc bcnyPgXDaW40Bxgpk2CsHkYh8PFi77PyUUHv/gco3aRq6nSLAkiOtkeKRx5/bvpZST DSPaAOEBnDslBOedmb8XC6yIY9b2byr6nX900vio= Message-ID: <3b7abe37-4f6b-4af8-a78c-49ff5edff298@arm.com> Date: Wed, 26 Aug 2026 11:09:21 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/vmalloc: fix vmap_purge_lock livelock under memory pressure To: Uladzislau Rezki , Ye Liu Cc: Andrew Morton , Ye Liu , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260824095020.1225189-1-ye.liu@linux.dev> <0c34aab2-9b73-45c0-8fbe-e33895bc8eef@linux.dev> Content-Language: en-US From: Dev Jain In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 202CF20002 X-Stat-Signature: 8oqbfyhsrn9t8mf5ggbdda4bfsnxq7mo X-Rspam-User: X-HE-Tag: 1787722766-11618 X-HE-Meta: U2FsdGVkX181OamibiQQdo+Cdt0IUqAMq7nVRt+NdQ7URqgCMAjELz/B8SU4x0Z0pNTQV8lkJ3iMJ+gf0x0eGNdUd0jkkwCYYl+dt1mLRN5knoCqUBfKGmNyQfDhFphllGsG5TiENSdgezv6E9DQ6+6PusbjX2jEBkIRLTqFiuVQ8tLvikbqZGOHBQhF/7d9H0q1iTXOifiapljVv7xy9400wglXBL18+/uljkZrw92jdE+oBbKNVKflPlu/2tT7IJGdRTji5qfMGVva7qTYMzgP+xBADfi+rLsdKZ5HwPBprMpyIhfzzODgY/oEvt98yANQMsspTKRD7T+hWKyLq13q72JvRjEdVri6IREqyUnqC7SMyvkgZ4e/rRDIDo+q+hocgPOEnsoRpcVyBvlJjwE9A+gpw5Spvf5utiy7LUg6EbG0SumnfLB/A8/l9ISFmYf0tTK7cvb+z3/6q6Y4uGHBeE63XUkwKBFwqxddBQjj0l3K/JmCyiVD8HDPk3YXnZ+nZpOpGJKOW+V2IDcDGtO6UanTjZKwvKaPWaGS/RiJ4dpMvLvFGyq90e2fGVHNGsYa8q1tYH6f9a2czsV4oju60moVEwo4x4LoIr3FTOX9zgLF2inCL6zgDO9Mf4AnZa5NMrcJaVwvkDXcISfCnuQVapuR3XxqP6D8VITxy2/OfO6smBbRIIDXm9M0WhSUxwPSWdwfKIEPYIl1Ga1mKpVETjUfTbsQmAuVQDvsL35oasMRE/KcYigHG/xYfL9fNRrsJIXEt3zb/inEck9hwmobSvm6xCoe1jBzZjf7RTO66y8HZmt5zmaN6l2osDvM27SVHG+/IJYlKI6B6x+9HybDrBBzxdGfxUY97qoxbawz9qFaDymfZL5X7ofWL2pQC98wqCvlMXKFfp3E3WAMUWNFeyeztD1mEsnYCBNzX2q9ZnQ/vMZXr3k8pn2yDa84eCmdnaeSnnbaFup4E6f lvrk8G99 S+aXh2umlb79UHPQOCNxHowQpPZIqCcffVRFdMvu9EwU2Lio5txxNC4TiYjBCa+AVLpIL1BwpPeSLEfXODqn8cAQCUEnTmoff9A0sIPynJfaK4VE8dLnDo8QJXtT6nyjDBqRWkkRPz7VHdYl6kw4lHlPcgeCCemS5Qugt/eZGXNn6DVviHwU04/ayUQdWHi5N2l0SbdXt1QAtmKi7vLETpFML8ujLuXwIwNn45iYMJHl2U7f+qxoDjJMHWftLnnW4ND1qeZFG4g3oK7i00lC7USr5HErYSL4a7ZZT3bPFRaY0tY0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 25/08/26 11:10 pm, Uladzislau Rezki wrote: > On Tue, Aug 25, 2026 at 09:04:24AM +0800, Ye Liu wrote: >> >> >> 在 2026/8/24 21:19, Uladzislau Rezki 写道: >>> On Mon, Aug 24, 2026 at 05:50:19PM +0800, Ye Liu wrote: >>>> From: Ye Liu >>>> >>>> The vmap_purge_lock mutex can be held for an extended period by >>>> __purge_vmap_area_lazy() which calls flush_work() to wait for >>>> purge_vmap_node workers while holding the lock. Under memory >>>> pressure, those workers may themselves be blocked in direct >>>> reclaim trying to acquire the same lock via the >>>> vmap_node_shrink_scan() shrinker callback, creating a circular >>>> dependency that deadlocks the entire system. >>>> >>>> Two changes: >>>> >>>> 1. vmap_node_shrink_scan(): replace blocking guard(mutex) with >>>> mutex_trylock(). This is a shrinker that only decays the vmap >>>> pool and returns SHRINK_STOP without freeing memory; skipping a >>>> decay cycle when the lock is contended is harmless and prevents >>>> tasks from piling up on the mutex in the direct reclaim path. >>>> >>>> 2. __purge_vmap_area_lazy(): purge all vmap nodes inline instead of >>>> scheduling purge_vmap_node via workqueue and calling flush_work() >>>> while holding vmap_purge_lock. The workqueue dispatch + flush >>>> pattern under a mutex is the deadlock trigger: if no free worker >>>> threads are available (all blocked on the same lock), flush_work() >>>> never returns and the lock is held indefinitely. >>>> >>>> Fixes: 7679ba6b36db ("mm: vmalloc: add a shrinker to drain vmap pools") >>>> Signed-off-by: Ye Liu >>>> --- >>>> mm/vmalloc.c | 51 +++++++++++++++++++++------------------------------ >>>> 1 file changed, 21 insertions(+), 30 deletions(-) >>>> >>>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c >>>> index bea9f76ed7e7..41443708d22d 100644 >>>> --- a/mm/vmalloc.c >>>> +++ b/mm/vmalloc.c >>>> @@ -2358,7 +2358,6 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end, >>>> bool full_pool_decay) >>>> { >>>> unsigned long nr_purged_areas = 0; >>>> - unsigned int nr_purge_helpers; >>>> static cpumask_t purge_nodes; >>>> unsigned int nr_purge_nodes; >>>> struct vmap_node *vn; >>>> @@ -2397,36 +2396,17 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end, >>>> if (nr_purge_nodes > 0) { >>>> flush_tlb_kernel_range(start, end); >>>> >>>> - /* One extra worker is per a lazy_max_pages() full set minus one. */ >>>> - nr_purge_helpers = atomic_long_read(&vmap_lazy_nr) / lazy_max_pages(); >>>> - nr_purge_helpers = clamp(nr_purge_helpers, 1U, nr_purge_nodes) - 1; >>>> - >>>> - for_each_cpu(i, &purge_nodes) { >>>> - vn = &vmap_nodes[i]; >>>> - >>>> - if (nr_purge_helpers > 0) { >>>> - INIT_WORK(&vn->purge_work, purge_vmap_node); >>>> - >>>> - if (cpumask_test_cpu(i, cpu_online_mask)) >>>> - schedule_work_on(i, &vn->purge_work); >>>> - else >>>> - schedule_work(&vn->purge_work); >>>> - >>>> - nr_purge_helpers--; >>>> - } else { >>>> - vn->purge_work.func = NULL; >>>> - purge_vmap_node(&vn->purge_work); >>>> - nr_purged_areas += vn->nr_purged; >>>> - } >>>> - } >>>> - >>>> + /* >>>> + * Purge all nodes inline. Do not schedule_work() and >>>> + * flush_work() here: flush_work() while holding >>>> + * vmap_purge_lock can deadlock if the worker pool is >>>> + * starved (e.g. all workers blocked on this same lock >>>> + * in the direct reclaim path via vmap_node_shrink_scan). >>>> + */ >>>> for_each_cpu(i, &purge_nodes) { >>>> vn = &vmap_nodes[i]; >>>> - >>>> - if (vn->purge_work.func) { >>>> - flush_work(&vn->purge_work); >>>> - nr_purged_areas += vn->nr_purged; >>>> - } >>>> + purge_vmap_node(&vn->purge_work); >>>> + nr_purged_areas += vn->nr_purged; >>>> } >>>> } >>>> >>>> @@ -5519,10 +5499,21 @@ vmap_node_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) >>>> { >>>> struct vmap_node *vn; >>>> >>>> - guard(mutex)(&vmap_purge_lock); >>>> + /* >>>> + * This shrinker is invoked from direct reclaim path where memory >>>> + * pressure is already high. Blocking on vmap_purge_lock here can >>>> + * cause a pile-up of tasks all waiting for the same mutex while >>>> + * the lock holder may itself be blocked in flush_work() waiting for >>>> + * a worker that is stuck in the same reclaim path. Use trylock to >>>> + * avoid this; skipping a pool decay cycle is harmless. >>>> + */ >>>> + if (!mutex_trylock(&vmap_purge_lock)) >>>> + return SHRINK_STOP; >>>> + >>>> for_each_vmap_node(vn) >>>> decay_va_pool_node(vn, true); >>>> >>>> + mutex_unlock(&vmap_purge_lock); >>>> return SHRINK_STOP; >>>> } >>>> >>>> -- >>>> 2.25.1 >>>> >>> Have you seen any report about the problem you described? >>> >> Our testing team discovered the issue during testing with syzkaller >> on kernel version 6.6.89. The relevant warnings are shown below. >> >> INFO: task kworker/u80:6:141 blocked for more than 143 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:kworker/u80:6 state:D stack:0 pid:141 tgid:141 ppid:2 flags:0x00004000 >> Workqueue: events_unbound call_usermodehelper_exec_work >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> __alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:244 [inline] >> alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:271 [inline] >> alloc_thread_stack_node root/klinux/kernel/fork.c:367 [inline] >> dup_task_struct+0xa4/0x6c0 root/klinux/kernel/fork.c:1161 >> copy_process+0x4eb/0x57d0 root/klinux/kernel/fork.c:2261 >> kernel_clone+0xdd/0x910 root/klinux/kernel/fork.c:2849 >> user_mode_thread+0xcb/0x110 root/klinux/kernel/fork.c:2927 >> call_usermodehelper_exec_sync root/klinux/kernel/umh.c:133 [inline] >> call_usermodehelper_exec_work+0x69/0x170 root/klinux/kernel/umh.c:164 >> process_one_work+0x90d/0x1aa0 root/klinux/kernel/workqueue.c:3235 >> process_scheduled_works root/klinux/kernel/workqueue.c:3315 [inline] >> worker_thread+0x633/0xe80 root/klinux/kernel/workqueue.c:3396 >> kthread+0x317/0x420 root/klinux/kernel/kthread.c:388 >> ret_from_fork+0x4ae/0x5e0 root/klinux/arch/x86/kernel/process.c:152 >> ret_from_fork_asm+0x1a/0x30 root/klinux/arch/x86/entry/entry_64.S:293 >> >> INFO: task syz-executor.0:37820 blocked for more than 143 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:syz-executor.0 state:D stack:0 pid:37820 tgid:37820 ppid:1 flags:0x00000004 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> alloc_pages_mpol_noprof+0x1ee/0x530 root/klinux/mm/mempolicy.c:2270 >> pagetable_alloc_noprof root/klinux/./include/linux/mm.h:2982 [inline] >> __pud_alloc_one_noprof root/klinux/./include/asm-generic/pgalloc.h:174 [inline] >> pud_alloc_one_noprof root/klinux/./include/asm-generic/pgalloc.h:195 [inline] >> __pud_alloc+0x40/0x650 root/klinux/mm/memory.c:6222 >> pud_alloc root/klinux/./include/linux/mm.h:2939 [inline] >> copy_pud_range root/klinux/mm/memory.c:1270 [inline] >> copy_p4d_range+0x95e/0xb70 root/klinux/mm/memory.c:1314 >> copy_page_range+0x432/0xa30 root/klinux/mm/memory.c:1408 >> dup_mmap+0x1127/0x1ef0 root/klinux/kernel/fork.c:773 >> dup_mm+0x93/0x4e0 root/klinux/kernel/fork.c:1722 >> copy_mm root/klinux/kernel/fork.c:1781 [inline] >> copy_process+0x2c89/0x57d0 root/klinux/kernel/fork.c:2436 >> kernel_clone+0xdd/0x910 root/klinux/kernel/fork.c:2849 >> __do_sys_clone+0xcf/0x120 root/klinux/kernel/fork.c:2992 >> do_syscall_x64 root/klinux/arch/x86/entry/common.c:51 [inline] >> do_syscall_64+0x74/0x360 root/klinux/arch/x86/entry/common.c:81 >> entry_SYSCALL_64_after_hwframe+0x76/0xe0 >> RIP: 0033:0x45d778 >> RSP: 002b:00007ffc4d846860 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 >> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d778 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 >> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000013782980 >> R10: 0000000013782c50 R11: 0000000000000246 R12: 0000000000000000 >> R13: 0000000000000032 R14: 0000000000000000 R15: 0000000000000000 >> >> INFO: task syz-executor.10:56553 blocked for more than 143 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:syz-executor.10 state:D stack:0 pid:56553 tgid:56553 ppid:1 flags:0x00000004 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> __alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:244 [inline] >> alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:271 [inline] >> alloc_thread_stack_node root/klinux/kernel/fork.c:367 [inline] >> dup_task_struct+0xa4/0x6c0 root/klinux/kernel/fork.c:1161 >> copy_process+0x4eb/0x57d0 root/klinux/kernel/fork.c:2261 >> kernel_clone+0xdd/0x910 root/klinux/kernel/fork.c:2849 >> __do_sys_clone+0xcf/0x120 root/klinux/kernel/fork.c:2992 >> do_syscall_x64 root/klinux/arch/x86/entry/common.c:51 [inline] >> do_syscall_64+0x74/0x360 root/klinux/arch/x86/entry/common.c:81 >> entry_SYSCALL_64_after_hwframe+0x76/0xe0 >> RIP: 0033:0x45d778 >> RSP: 002b:00007ffc6a4dad70 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 >> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045d778 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 >> RBP: 0000000000000000 R08: 0000000000000000 R09: 000000002d906980 >> R10: 000000002d906c50 R11: 0000000000000246 R12: 0000000000000000 >> R13: 0000000000000032 R14: 0000000000000001 R15: 0000000000000000 >> >> INFO: task kworker/12:13:56977 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:kworker/12:13 state:D stack:0 pid:56977 tgid:56977 ppid:2 flags:0x00004000 >> Workqueue: events drain_vmap_area_work >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_timeout+0x268/0x2b0 root/klinux/kernel/time/timer.c:2142 >> do_wait_for_common root/klinux/kernel/sched/completion.c:95 [inline] >> __wait_for_common+0x3ea/0x600 root/klinux/kernel/sched/completion.c:116 >> __flush_work+0xf4/0x180 root/klinux/kernel/workqueue.c:4125 >> __purge_vmap_area_lazy+0x8e5/0xcf0 root/klinux/mm/vmalloc.c:2324 >> drain_vmap_area_work+0x2c/0x40 root/klinux/mm/vmalloc.c:2349 >> process_one_work+0x90d/0x1aa0 root/klinux/kernel/workqueue.c:3235 >> process_scheduled_works root/klinux/kernel/workqueue.c:3315 [inline] >> worker_thread+0x633/0xe80 root/klinux/kernel/workqueue.c:3396 >> kthread+0x317/0x420 root/klinux/kernel/kthread.c:388 >> ret_from_fork+0x4ae/0x5e0 root/klinux/arch/x86/kernel/process.c:152 >> ret_from_fork_asm+0x1a/0x30 root/klinux/arch/x86/entry/entry_64.S:293 >> >> INFO: task kdamond.0:66163 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:kdamond.0 state:D stack:0 pid:66163 tgid:66163 ppid:2 flags:0x00004000 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> alloc_pages_mpol_noprof+0x1ee/0x530 root/klinux/mm/mempolicy.c:2270 >> alloc_slab_page root/klinux/mm/slub.c:2315 [inline] >> allocate_slab+0x27a/0x3f0 root/klinux/mm/slub.c:2485 >> ___slab_alloc+0x889/0x1060 root/klinux/mm/slub.c:3727 >> __slab_alloc.constprop.0+0x52/0xa0 root/klinux/mm/slub.c:3817 >> __slab_alloc_node root/klinux/mm/slub.c:3870 [inline] >> slab_alloc_node root/klinux/mm/slub.c:4031 [inline] >> kmem_cache_alloc_noprof+0x385/0x3e0 root/klinux/mm/slub.c:4050 >> damon_new_region+0x29/0x1a0 root/klinux/mm/damon/core.c:124 >> damon_va_evenly_split_region+0x1f8/0x2c0 root/klinux/mm/damon/vaddr.c:85 >> __damon_va_init_regions root/klinux/mm/damon/vaddr.c:271 [inline] >> damon_va_init+0x2b5/0x470 root/klinux/mm/damon/vaddr.c:283 >> kdamond_fn+0x289/0x1240 root/klinux/mm/damon/core.c:1432 >> kthread+0x317/0x420 root/klinux/kernel/kthread.c:388 >> ret_from_fork+0x4ae/0x5e0 root/klinux/arch/x86/kernel/process.c:152 >> ret_from_fork_asm+0x1a/0x30 root/klinux/arch/x86/entry/entry_64.S:293 >> >> INFO: task kworker/u80:5:67724 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:kworker/u80:5 state:D stack:0 pid:67724 tgid:67724 ppid:2 flags:0x00004000 >> Workqueue: events_unbound call_usermodehelper_exec_work >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> __alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:244 [inline] >> alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:271 [inline] >> alloc_thread_stack_node root/klinux/kernel/fork.c:367 [inline] >> dup_task_struct+0xa4/0x6c0 root/klinux/kernel/fork.c:1161 >> copy_process+0x4eb/0x57d0 root/klinux/kernel/fork.c:2261 >> kernel_clone+0xdd/0x910 root/klinux/kernel/fork.c:2849 >> user_mode_thread+0xcb/0x110 root/klinux/kernel/fork.c:2927 >> call_usermodehelper_exec_sync root/klinux/kernel/umh.c:133 [inline] >> call_usermodehelper_exec_work+0x69/0x170 root/klinux/kernel/umh.c:164 >> process_one_work+0x90d/0x1aa0 root/klinux/kernel/workqueue.c:3235 >> process_scheduled_works root/klinux/kernel/workqueue.c:3315 [inline] >> worker_thread+0x633/0xe80 root/klinux/kernel/workqueue.c:3396 >> kthread+0x317/0x420 root/klinux/kernel/kthread.c:388 >> ret_from_fork+0x4ae/0x5e0 root/klinux/arch/x86/kernel/process.c:152 >> ret_from_fork_asm+0x1a/0x30 root/klinux/arch/x86/entry/entry_64.S:293 >> >> INFO: task kworker/u80:9:69412 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:kworker/u80:9 state:D stack:0 pid:69412 tgid:69412 ppid:2 flags:0x00004000 >> Workqueue: events_unbound call_usermodehelper_exec_work >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> __alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:244 [inline] >> alloc_pages_node_noprof root/klinux/./include/linux/gfp.h:271 [inline] >> alloc_thread_stack_node root/klinux/kernel/fork.c:367 [inline] >> dup_task_struct+0xa4/0x6c0 root/klinux/kernel/fork.c:1161 >> copy_process+0x4eb/0x57d0 root/klinux/kernel/fork.c:2261 >> kernel_clone+0xdd/0x910 root/klinux/kernel/fork.c:2849 >> user_mode_thread+0xcb/0x110 root/klinux/kernel/fork.c:2927 >> call_usermodehelper_exec_sync root/klinux/kernel/umh.c:133 [inline] >> call_usermodehelper_exec_work+0x69/0x170 root/klinux/kernel/umh.c:164 >> process_one_work+0x90d/0x1aa0 root/klinux/kernel/workqueue.c:3235 >> process_scheduled_works root/klinux/kernel/workqueue.c:3315 [inline] >> worker_thread+0x633/0xe80 root/klinux/kernel/workqueue.c:3396 >> kthread+0x317/0x420 root/klinux/kernel/kthread.c:388 >> ret_from_fork+0x4ae/0x5e0 root/klinux/arch/x86/kernel/process.c:152 >> ret_from_fork_asm+0x1a/0x30 root/klinux/arch/x86/entry/entry_64.S:293 >> >> INFO: task syz-executor.18:73039 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:syz-executor.18 state:D stack:0 pid:73039 tgid:73039 ppid:1 flags:0x00004004 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> alloc_pages_mpol_noprof+0x1ee/0x530 root/klinux/mm/mempolicy.c:2270 >> folio_alloc_mpol_noprof+0x3b/0xd0 root/klinux/mm/mempolicy.c:2288 >> vma_alloc_folio_noprof+0xaf/0x140 root/klinux/mm/mempolicy.c:2316 >> folio_prealloc root/klinux/mm/memory.c:1062 [inline] >> wp_page_copy+0x21a/0x11c0 root/klinux/mm/memory.c:3308 >> do_wp_page+0x762/0x14e0 root/klinux/mm/memory.c:3700 >> handle_pte_fault+0x573/0x730 root/klinux/mm/memory.c:5717 >> __handle_mm_fault+0xae4/0x10d0 root/klinux/mm/memory.c:5844 >> handle_mm_fault+0x376/0x650 root/klinux/mm/memory.c:6009 >> do_user_addr_fault+0x2be/0xc40 root/klinux/arch/x86/mm/fault.c:1330 >> handle_page_fault root/klinux/arch/x86/mm/fault.c:1471 [inline] >> exc_page_fault+0x5c/0xe0 root/klinux/arch/x86/mm/fault.c:1527 >> asm_exc_page_fault+0x26/0x30 root/klinux/./arch/x86/include/asm/idtentry.h:608 >> RIP: 0033:0x45d8e1 >> RSP: 002b:00007ffd015d5e10 EFLAGS: 00010246 >> RAX: 000000000000003b RBX: 0000000000000000 RCX: 000000000045d778 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 >> RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000701d980 >> R10: 000000000701dc50 R11: 0000000000000246 R12: 000000000000003b >> R13: 0000000000000032 R14: 0000000000000000 R15: 0000000000000000 >> >> INFO: task syz-executor.13:74790 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:syz-executor.13 state:D stack:0 pid:74790 tgid:74790 ppid:1 flags:0x00000004 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> alloc_pages_mpol_noprof+0x1ee/0x530 root/klinux/mm/mempolicy.c:2270 >> folio_alloc_mpol_noprof+0x3b/0xd0 root/klinux/mm/mempolicy.c:2288 >> vma_alloc_folio_noprof+0xaf/0x140 root/klinux/mm/mempolicy.c:2316 >> folio_prealloc root/klinux/mm/memory.c:1062 [inline] >> wp_page_copy+0x21a/0x11c0 root/klinux/mm/memory.c:3308 >> do_wp_page+0x762/0x14e0 root/klinux/mm/memory.c:3700 >> handle_pte_fault+0x573/0x730 root/klinux/mm/memory.c:5717 >> __handle_mm_fault+0xae4/0x10d0 root/klinux/mm/memory.c:5844 >> handle_mm_fault+0x376/0x650 root/klinux/mm/memory.c:6009 >> do_user_addr_fault+0x2be/0xc40 root/klinux/arch/x86/mm/fault.c:1330 >> handle_page_fault root/klinux/arch/x86/mm/fault.c:1471 [inline] >> exc_page_fault+0x5c/0xe0 root/klinux/arch/x86/mm/fault.c:1527 >> asm_exc_page_fault+0x26/0x30 root/klinux/./arch/x86/include/asm/idtentry.h:608 >> RIP: 0033:0x45d8e1 >> RSP: 002b:00007ffe18ac7000 EFLAGS: 00010246 >> RAX: 0000000000000038 RBX: 0000000000000000 RCX: 000000000045d778 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 >> RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000eb5f980 >> R10: 000000000eb5fc50 R11: 0000000000000246 R12: 0000000000000038 >> R13: 0000000000000032 R14: 0000000000000001 R15: 0000000000000000 >> >> INFO: task syz-executor.5:78550 blocked for more than 144 seconds. >> Tainted: G S ------- ---- 6.6.89+ #931 >> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >> task:syz-executor.5 state:D stack:0 pid:78550 tgid:78550 ppid:1 flags:0x00000004 >> Call Trace: >> >> context_switch root/klinux/kernel/sched/core.c:5346 [inline] >> __schedule+0x7bc/0x1310 root/klinux/kernel/sched/core.c:6720 >> __schedule_loop root/klinux/kernel/sched/core.c:6797 [inline] >> schedule+0xe2/0x290 root/klinux/kernel/sched/core.c:6812 >> schedule_preempt_disabled+0x18/0x30 root/klinux/kernel/sched/core.c:6869 >> __mutex_lock_common root/klinux/kernel/locking/mutex.c:679 [inline] >> __mutex_lock+0x914/0x13a0 root/klinux/kernel/locking/mutex.c:747 >> class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> do_shrink_slab+0x3c9/0xf30 root/klinux/mm/shrinker.c:435 >> shrink_slab+0x175/0x5e0 root/klinux/mm/shrinker.c:662 >> shrink_node_memcgs+0x4d6/0x700 root/klinux/mm/vmscan.c:5900 >> shrink_node+0x247/0x12c0 root/klinux/mm/vmscan.c:5933 >> shrink_zones root/klinux/mm/vmscan.c:6175 [inline] >> do_try_to_free_pages+0x314/0x1580 root/klinux/mm/vmscan.c:6237 >> try_to_free_pages+0x293/0x740 root/klinux/mm/vmscan.c:6472 >> __perform_reclaim root/klinux/mm/page_alloc.c:3965 [inline] >> __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> __alloc_pages_slowpath.constprop.0+0x800/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> __alloc_pages_noprof+0x490/0x570 root/klinux/mm/page_alloc.c:4792 >> alloc_pages_mpol_noprof+0x1ee/0x530 root/klinux/mm/mempolicy.c:2270 >> folio_alloc_mpol_noprof+0x3b/0xd0 root/klinux/mm/mempolicy.c:2288 >> vma_alloc_folio_noprof+0xaf/0x140 root/klinux/mm/mempolicy.c:2316 >> folio_prealloc root/klinux/mm/memory.c:1062 [inline] >> wp_page_copy+0x21a/0x11c0 root/klinux/mm/memory.c:3308 >> do_wp_page+0x762/0x14e0 root/klinux/mm/memory.c:3700 >> handle_pte_fault+0x573/0x730 root/klinux/mm/memory.c:5717 >> __handle_mm_fault+0xae4/0x10d0 root/klinux/mm/memory.c:5844 >> handle_mm_fault+0x376/0x650 root/klinux/mm/memory.c:6009 >> do_user_addr_fault+0x2be/0xc40 root/klinux/arch/x86/mm/fault.c:1330 >> handle_page_fault root/klinux/arch/x86/mm/fault.c:1471 [inline] >> exc_page_fault+0x5c/0xe0 root/klinux/arch/x86/mm/fault.c:1527 >> asm_exc_page_fault+0x26/0x30 root/klinux/./arch/x86/include/asm/idtentry.h:608 >> RIP: 0033:0x45d8e1 >> RSP: 002b:00007fff9b912230 EFLAGS: 00010246 >> RAX: 0000000000000019 RBX: 0000000000000000 RCX: 000000000045d778 >> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 >> RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000cd3c980 >> R10: 000000000cd3cc50 R11: 0000000000000246 R12: 0000000000000019 >> R13: 0000000000000032 R14: 0000000000000001 R15: 0000000000000000 >> >> Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings >> >> Showing all locks held in the system: >> 2 locks held by kthreadd/2: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by kworker/u80:6/141: >> #0: ffff8881041a4d58 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x803/0x1aa0 root/klinux/kernel/workqueue.c:3210 >> #1: ffff8881053cfd80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x859/0x1aa0 root/klinux/kernel/workqueue.c:3211 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 1 lock held by khungtaskd/155: >> #0: ffffffff8b33eb00 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire root/klinux/./include/linux/rcupdate.h:334 [inline] >> #0: ffffffff8b33eb00 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock root/klinux/./include/linux/rcupdate.h:786 [inline] >> #0: ffffffff8b33eb00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 root/klinux/kernel/locking/lockdep.c:6721 >> 2 locks held by bash/957: >> #0: ffff88800310d0a8 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x29/0x80 root/klinux/drivers/tty/tty_ldisc.c:243 >> #1: ffffc900039852f8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xd55/0x1230 root/klinux/drivers/tty/n_tty.c:2217 >> 5 locks held by syz-executor.0/37820: >> #0: ffffffff8b511780 (dup_mmap_sem){++++}-{0:0}, at: dup_mmap+0xbe/0x1ef0 root/klinux/kernel/fork.c:668 >> #1: ffff888106b396e8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable root/klinux/./include/linux/mmap_lock.h:124 [inline] >> #1: ffff888106b396e8 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap+0xdc/0x1ef0 root/klinux/kernel/fork.c:669 >> #2: ffff88801ff62be8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested root/klinux/./include/linux/mmap_lock.h:115 [inline] >> #2: ffff88801ff62be8 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap+0x125/0x1ef0 root/klinux/kernel/fork.c:678 >> #3: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #3: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #3: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #4: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #4: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by bash/41651: >> #0: ffff88801f8cb8a8 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x29/0x80 root/klinux/drivers/tty/tty_ldisc.c:243 >> #1: ffffc900001fd2f8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xd55/0x1230 root/klinux/drivers/tty/n_tty.c:2217 >> 2 locks held by syz-executor.10/56553: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by kworker/12:13/56977: >> #0: ffff88810419cb58 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x803/0x1aa0 root/klinux/kernel/workqueue.c:3210 >> #1: ffff88804264fd80 (drain_vmap_work){+.+.}-{0:0}, at: process_one_work+0x859/0x1aa0 root/klinux/kernel/workqueue.c:3211 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: drain_vmap_area_work+0x1c/0x40 root/klinux/mm/vmalloc.c:2348 >> 2 locks held by kdamond.0/66163: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by kworker/u80:5/67724: >> #0: ffff8881041a4d58 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x803/0x1aa0 root/klinux/kernel/workqueue.c:3210 >> #1: ffff88804664fd80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x859/0x1aa0 root/klinux/kernel/workqueue.c:3211 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by kworker/u80:9/69412: >> #0: ffff8881041a4d58 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x803/0x1aa0 root/klinux/kernel/workqueue.c:3210 >> #1: ffff8880346afd80 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x859/0x1aa0 root/klinux/kernel/workqueue.c:3211 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.18/73039: >> #0: ffff888048652940 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff888048652940 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.13/74790: >> #0: ffff88803e37eeb8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88803e37eeb8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.5/78550: >> #0: ffff88801f4310e8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88801f4310e8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.26/80991: >> #0: ffff88801b3c6068 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock root/klinux/./include/linux/mmap_lock.h:146 [inline] >> #0: ffff88801b3c6068 (&mm->mmap_lock){++++}-{3:3}, at: __mm_populate+0x220/0x360 root/klinux/mm/gup.c:2170 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by syz-executor.5/80992: >> #0: ffff888104871430 (sb_writers#2){.+.+}-{0:0}, at: get_signal+0x18d9/0x1a60 root/klinux/kernel/signal.c:2915 >> #1: ffff888001a29818 (&sb->s_type->i_mutex_key){++++}-{3:3}, at: inode_lock root/klinux/./include/linux/fs.h:828 [inline] >> #1: ffff888001a29818 (&sb->s_type->i_mutex_key){++++}-{3:3}, at: generic_file_write_iter+0x91/0x2f0 root/klinux/mm/filemap.c:4181 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.22/81067: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.31/81012: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.31/81059: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.23/81024: >> #0: ffff88804a3aa080 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88804a3aa080 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.23/81030: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.27/81031: >> #0: ffff88802008cb70 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88802008cb70 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.30/81070: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by syz-executor.28/81036: >> #0: ffff888104871430 (sb_writers#2){.+.+}-{0:0}, at: filename_create+0xf9/0x4c0 root/klinux/fs/namei.c:3928 >> #1: ffff88817b041270 (&sb->s_type->i_mutex_key/1){+.+.}-{3:3}, at: inode_lock_nested root/klinux/./include/linux/fs.h:863 [inline] >> #1: ffff88817b041270 (&sb->s_type->i_mutex_key/1){+.+.}-{3:3}, at: filename_create+0x1a1/0x4c0 root/klinux/fs/namei.c:3935 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.12/81086: >> #0: ffff88801f2a45f8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88801f2a45f8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 4 locks held by syz-executor.22/81082: >> #0: ffff888104871430 (sb_writers#2){.+.+}-{0:0}, at: get_signal+0x18d9/0x1a60 root/klinux/kernel/signal.c:2915 >> #1: ffff88805c122910 (&sb->s_type->i_mutex_key){++++}-{3:3}, at: inode_lock root/klinux/./include/linux/fs.h:828 [inline] >> #1: ffff88805c122910 (&sb->s_type->i_mutex_key){++++}-{3:3}, at: generic_file_write_iter+0x91/0x2f0 root/klinux/mm/filemap.c:4181 >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #2: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #3: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.17/81084: >> #0: ffff888084e01430 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff888084e01430 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.21/81088: >> #0: ffff88801cde23c8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88801cde23c8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.5/81089: >> #0: ffff888004d1abe8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock root/klinux/./include/linux/mmap_lock.h:165 [inline] >> #0: ffff888004d1abe8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully root/klinux/mm/memory.c:6036 [inline] >> #0: ffff888004d1abe8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x5c0 root/klinux/mm/memory.c:6096 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.13/81090: >> #0: ffff888004d1f568 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock root/klinux/./include/linux/mmap_lock.h:165 [inline] >> #0: ffff888004d1f568 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully root/klinux/mm/memory.c:6036 [inline] >> #0: ffff888004d1f568 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x5c0 root/klinux/mm/memory.c:6096 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.18/81091: >> #0: ffff888004d1d5e8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock root/klinux/./include/linux/mmap_lock.h:165 [inline] >> #0: ffff888004d1d5e8 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully root/klinux/mm/memory.c:6036 [inline] >> #0: ffff888004d1d5e8 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x5c0 root/klinux/mm/memory.c:6096 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 2 locks held by syz-executor.7/81096: >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #0: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #1: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> 3 locks held by syz-executor.16/81095: >> #0: ffff88801de15e08 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read root/klinux/./include/linux/mm.h:694 [inline] >> #0: ffff88801de15e08 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x1c7/0x6f0 root/klinux/mm/memory.c:6165 >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim root/klinux/mm/page_alloc.c:3962 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim root/klinux/mm/page_alloc.c:3987 [inline] >> #1: ffffffff8b56b4c0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath.constprop.0+0x74d/0x1fb0 root/klinux/mm/page_alloc.c:4394 >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: class_mutex_constructor root/klinux/./include/linux/mutex.h:200 [inline] >> #2: ffffffff8b567390 (vmap_purge_lock){+.+.}-{3:3}, at: vmap_node_shrink_scan+0x1d/0x90 root/klinux/mm/vmalloc.c:5108 >> >> ============================================= >> >> >>> -- >>> Uladzislau Rezki >> >> -- >> Thanks, >> Ye Liu >> > Thank you! > > I can trigger below: > > > Aug 25 13:56:52 pc638 kernel: Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings > Aug 25 13:56:52 pc638 kernel: > Showing all locks held in the system: > Aug 25 13:56:52 pc638 kernel: 1 lock held by khungtaskd/488: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3306840 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x47/0x19b > Aug 25 13:56:52 pc638 kernel: 3 locks held by kworker/52:1/694: > Aug 25 13:56:52 pc638 kernel: #0: ffff8ac4401a4140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x57b/0x600 > Aug 25 13:56:52 pc638 kernel: #1: ffffce26435ffe30 (drain_vmap_work){+.+.}-{0:0}, at: process_one_work+0x1fc/0x600 > Aug 25 13:56:52 pc638 kernel: #2: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: drain_vmap_area_work+0x1b/0x40 > Aug 25 13:56:52 pc638 kernel: 1 lock held by in:imklog/3831: > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/2/5009: > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/4/5011: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/5/5012: > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/8/5015: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/30/5037: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/31/5038: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/38/5045: > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/39/5046: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/41/5048: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/49/5056: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/51/5058: > Aug 25 13:56:52 pc638 kernel: #0: ffffffffa3406300 (vmap_purge_lock){+.+.}-{4:4}, at: alloc_vmap_area+0x8a8/0xd20 > Aug 25 13:56:52 pc638 kernel: 1 lock held by vmalloc_test/57/5064: > ... > > > I think this is with your patch. But i can check also without. > One potential issue to inline vnode-drain - is a time. At least > we need to inject cond_resched() after each vnode flush + > > /* > * Reclaim vmap areas by purging fragmented blocks and purge_vmap_area_list. > */ > static void reclaim_and_purge_vmap_areas(void) > > { > mutex_lock(&vmap_purge_lock); > purge_fragmented_blocks_allcpus(); > __purge_vmap_area_lazy(ULONG_MAX, 0, true); > mutex_unlock(&vmap_purge_lock); > } > > here use try-lock as well due to potentially increased flush time. > > Any thoughts? > > -- > Uladzislau Rezki IIUC we won't have to do inline purge if we switch both places to use mutex_trylock?