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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1522:b0:3d3:d1a8:8e82 with SMTP id e9e14a558f8ab-3d44af25575mr66940415ab.9.1741516828928; Sun, 09 Mar 2025 03:40:28 -0700 (PDT) Date: Sun, 09 Mar 2025 03:40:28 -0700 In-Reply-To: <67b1f949.050a0220.173698.000c.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67cd701c.050a0220.2eb24d.0000.GAE@google.com> Subject: Re: [syzbot] [bcachefs?] possible deadlock in get_partial_node (2) From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: b7c90e3e717a Merge tag 'x86-urgent-2025-03-08' of git://gi.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10898664580000 kernel config: https://syzkaller.appspot.com/x/.config?x=523d3ff8e053340a dashboard link: https://syzkaller.appspot.com/bug?extid=725322cc4ff5c53abfac compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=137c1fa0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e0fa54580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/efe746eddadf/disk-b7c90e3e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8dcac591074f/vmlinux-b7c90e3e.xz kernel image: https://storage.googleapis.com/syzbot-assets/f9ac7aeb49a3/bzImage-b7c90e3e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/b499053db8a0/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+725322cc4ff5c53abfac@syzkaller.appspotmail.com ============================================================================= ====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Not tainted ------------------------------------------------------ syz-executor131/5940 is trying to acquire lock: ffffffff8ea14fb8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline] ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:5609 [inline] ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x9c/0x430 mm/slub.c:5647 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&n->list_lock){-.-.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 get_partial_node+0x37/0x3f0 mm/slub.c:2834 get_partial mm/slub.c:2948 [inline] ___slab_alloc+0xb75/0x14a0 mm/slub.c:3806 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4171 kmem_alloc_batch lib/debugobjects.c:371 [inline] fill_pool+0x260/0x680 lib/debugobjects.c:403 debug_objects_fill_pool lib/debugobjects.c:725 [inline] debug_object_activate+0x493/0x580 lib/debugobjects.c:814 debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline] debug_activate kernel/time/hrtimer.c:496 [inline] enqueue_hrtimer+0x30/0x3c0 kernel/time/hrtimer.c:1100 __hrtimer_start_range_ns kernel/time/hrtimer.c:1282 [inline] hrtimer_start_range_ns+0xcc3/0xfa0 kernel/time/hrtimer.c:1343 hrtimer_start include/linux/hrtimer.h:260 [inline] start_dl_timer+0x36a/0x4e0 kernel/sched/deadline.c:1190 update_curr_dl_se+0x348/0x860 kernel/sched/deadline.c:1539 update_curr+0x568/0xda0 kernel/sched/fair.c:1246 entity_tick kernel/sched/fair.c:5628 [inline] task_tick_fair+0x69/0x4e0 kernel/sched/fair.c:13091 sched_tick+0x21e/0x660 kernel/sched/core.c:5661 update_process_times+0x276/0x2f0 kernel/time/timer.c:2520 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x551/0xd30 kernel/time/hrtimer.c:1865 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline] lock_is_held_type+0x67/0x190 kernel/locking/lockdep.c:5919 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0xa5/0x780 kernel/sched/core.c:8729 down_read+0x8e/0xa40 kernel/locking/rwsem.c:1523 anon_vma_lock_read include/linux/rmap.h:136 [inline] validate_mm+0x2c8/0x590 mm/vma.c:612 __split_vma+0xa60/0xbf0 mm/vma.c:513 split_vma mm/vma.c:542 [inline] vma_modify+0x244/0x330 mm/vma.c:1529 vma_modify_flags+0x3a5/0x430 mm/vma.c:1547 mprotect_fixup+0x45a/0xaa0 mm/mprotect.c:666 do_mprotect_pkey+0x99d/0xdd0 mm/mprotect.c:840 __do_sys_mprotect mm/mprotect.c:861 [inline] __se_sys_mprotect mm/mprotect.c:858 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:858 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (hrtimer_bases.lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 lock_hrtimer_base kernel/time/hrtimer.c:181 [inline] hrtimer_start_range_ns+0xf9/0xfa0 kernel/time/hrtimer.c:1341 hrtimer_start include/linux/hrtimer.h:260 [inline] start_dl_timer+0x36a/0x4e0 kernel/sched/deadline.c:1190 enqueue_dl_entity+0x1056/0x1db0 kernel/sched/deadline.c:2076 dl_server_start+0xe2/0x2a0 kernel/sched/deadline.c:1671 enqueue_task_fair+0x9d7/0xd40 kernel/sched/fair.c:7012 enqueue_task+0x73/0x3d0 kernel/sched/core.c:2070 activate_task kernel/sched/core.c:2117 [inline] wake_up_new_task+0x576/0xc70 kernel/sched/core.c:4879 kernel_clone+0x480/0x870 kernel/fork.c:2846 user_mode_thread+0x144/0x1c0 kernel/fork.c:2893 rest_init+0x23/0x300 init/main.c:708 start_kernel+0x484/0x510 init/main.c:1099 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:515 x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:496 common_startup_64+0x13e/0x147 -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 raw_spin_rq_lock kernel/sched/sched.h:1521 [inline] task_rq_lock+0xc6/0x360 kernel/sched/core.c:700 cgroup_move_task+0x9b/0x5a0 kernel/sched/psi.c:1161 css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x284/0x8b0 kernel/cgroup/cgroup.c:6695 copy_process+0x398a/0x3cf0 kernel/fork.c:2629 kernel_clone+0x223/0x870 kernel/fork.c:2815 user_mode_thread+0x144/0x1c0 kernel/fork.c:2893 rest_init+0x23/0x300 init/main.c:708 start_kernel+0x484/0x510 init/main.c:1099 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:515 x86_64_start_kernel+0x66/0x70 arch/x86/kernel/head64.c:496 common_startup_64+0x13e/0x147 -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4214 up+0x72/0x90 kernel/locking/semaphore.c:191 __up_console_sem kernel/printk/printk.c:343 [inline] __console_unlock+0x123/0x1f0 kernel/printk/printk.c:2869 __console_flush_and_unlock kernel/printk/printk.c:3271 [inline] console_unlock+0x18f/0x3b0 kernel/printk/printk.c:3309 vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432 _printk+0xd5/0x120 kernel/printk/printk.c:2457 bt_err+0x127/0x180 net/bluetooth/lib.c:296 hci_cmd_timeout+0x104/0x1e0 net/bluetooth/hci_core.c:1456 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2431 _printk+0xd5/0x120 kernel/printk/printk.c:2457 slab_bug+0x6d/0xc0 mm/slub.c:1028 slab_err+0x130/0x190 mm/slub.c:1129 list_slab_objects mm/slub.c:5580 [inline] free_partial mm/slub.c:5615 [inline] __kmem_cache_shutdown+0x134/0x430 mm/slub.c:5647 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:530 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x54e/0x650 block/bio.c:1662 bch2_fs_fs_io_direct_exit+0x19/0x30 fs/bcachefs/fs-io-direct.c:676 __bch2_fs_free fs/bcachefs/super.c:558 [inline] bch2_fs_release+0x1a9/0x7b0 fs/bcachefs/super.c:624 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 bch2_fs_get_tree+0xdee/0x17a0 fs/bcachefs/fs.c:2299 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: (console_sem).lock --> hrtimer_bases.lock --> &n->list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&n->list_lock); lock(hrtimer_bases.lock); lock(&n->list_lock); lock((console_sem).lock); *** DEADLOCK *** 4 locks held by syz-executor131/5940: #0: ffffffff8f2578c8 (bio_slab_lock){+.+.}-{4:4}, at: bio_put_slab block/bio.c:140 [inline] #0: ffffffff8f2578c8 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x42f/0x650 block/bio.c:1662 #1: ffffffff8e9d5210 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x3e/0x160 mm/slab_common.c:517 #2: ffffffff8ec221b0 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy+0x4c/0x160 mm/slab_common.c:518 #3: ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline] #3: ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:5609 [inline] #3: ffff88802a42da98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0x9c/0x430 mm/slub.c:5647 stack backtrace: CPU: 1 UID: 0 PID: 5940 Comm: syz-executor131 Not tainted 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326 console_trylock kernel/printk/printk.c:2852 [inline] console_trylock_spinning kernel/printk/printk.c:2009 [inline] vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2431 _printk+0xd5/0x120 kernel/printk/printk.c:2457 slab_bug+0x6d/0xc0 mm/slub.c:1028 slab_err+0x130/0x190 mm/slub.c:1129 list_slab_objects mm/slub.c:5580 [inline] free_partial mm/slub.c:5615 [inline] __kmem_cache_shutdown+0x134/0x430 mm/slub.c:5647 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:530 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x54e/0x650 block/bio.c:1662 bch2_fs_fs_io_direct_exit+0x19/0x30 fs/bcachefs/fs-io-direct.c:676 __bch2_fs_free fs/bcachefs/super.c:558 [inline] bch2_fs_release+0x1a9/0x7b0 fs/bcachefs/super.c:624 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 bch2_fs_get_tree+0xdee/0x17a0 fs/bcachefs/fs.c:2299 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04451d5c6a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 1e 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff28174678 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff28174710 RCX: 00007f04451d5c6a RDX: 00004000000000c0 RSI: 0000400000000000 RDI: 00007fff281746d0 RBP: 0000000000000000 R08: 00007fff28174710 R09: 0000000000005979 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 R13: 0000000001000000 R14: 00004000000000c0 R15: 0000000000000003 BUG bio-1200 (Not tainted): Objects remaining in bio-1200 on __kmem_cache_shutdown() ----------------------------------------------------------------------------- Slab 0xffffea0001938500 objects=12 used=4 fp=0xffff888064e16a00 flags=0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) CPU: 1 UID: 0 PID: 5940 Comm: syz-executor131 Not tainted 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 slab_err+0x15a/0x190 mm/slub.c:1131 list_slab_objects mm/slub.c:5580 [inline] free_partial mm/slub.c:5615 [inline] __kmem_cache_shutdown+0x134/0x430 mm/slub.c:5647 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:530 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x54e/0x650 block/bio.c:1662 bch2_fs_fs_io_direct_exit+0x19/0x30 fs/bcachefs/fs-io-direct.c:676 __bch2_fs_free fs/bcachefs/super.c:558 [inline] bch2_fs_release+0x1a9/0x7b0 fs/bcachefs/super.c:624 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 bch2_fs_get_tree+0xdee/0x17a0 fs/bcachefs/fs.c:2299 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04451d5c6a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 1e 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff28174678 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff28174710 RCX: 00007f04451d5c6a RDX: 00004000000000c0 RSI: 0000400000000000 RDI: 00007fff281746d0 RBP: 0000000000000000 R08: 00007fff28174710 R09: 0000000000005979 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 R13: 0000000001000000 R14: 00004000000000c0 R15: 0000000000000003 Object 0xffff888064e15500 @offset=5376 Object 0xffff888064e15a40 @offset=6720 Object 0xffff888064e15f80 @offset=8064 Object 0xffff888064e164c0 @offset=9408 ------------[ cut here ]------------ kmem_cache_destroy bio-1200: Slab cache still has objects when called from bio_put_slab block/bio.c:155 [inline] kmem_cache_destroy bio-1200: Slab cache still has objects when called from bioset_exit+0x54e/0x650 block/bio.c:1662 WARNING: CPU: 0 PID: 5940 at mm/slab_common.c:533 kmem_cache_destroy+0x153/0x160 mm/slab_common.c:532 Modules linked in: CPU: 0 UID: 0 PID: 5940 Comm: syz-executor131 Tainted: G B 6.14.0-rc5-syzkaller-00234-gb7c90e3e717a #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:kmem_cache_destroy+0x153/0x160 mm/slab_common.c:532 Code: 5f 18 48 89 de 5b 41 5e 5d e9 e9 e7 13 00 90 48 8b 53 60 48 c7 c7 43 3c 2c 8e 48 c7 c6 7c 3c 2c 8e 48 89 e9 e8 2e 45 7a ff 90 <0f> 0b 90 90 e9 25 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000422f860 EFLAGS: 00010246 RAX: 56da6a4a7fb35b00 RBX: ffff8880664ea000 RCX: ffff888030589e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff84cabf9e R08: ffffffff81819d62 R09: fffffbfff1d3a68c R10: dffffc0000000000 R11: fffffbfff1d3a68c R12: 00000000000004b0 R13: 1ffff1100c489283 R14: 0000000000000001 R15: ffff88802758d748 FS: 000055557a2773c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f043d3ff000 CR3: 0000000030908000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: bio_put_slab block/bio.c:155 [inline] bioset_exit+0x54e/0x650 block/bio.c:1662 bch2_fs_fs_io_direct_exit+0x19/0x30 fs/bcachefs/fs-io-direct.c:676 __bch2_fs_free fs/bcachefs/super.c:558 [inline] bch2_fs_release+0x1a9/0x7b0 fs/bcachefs/super.c:624 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 bch2_fs_get_tree+0xdee/0x17a0 fs/bcachefs/fs.c:2299 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f04451d5c6a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 1e 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff28174678 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff28174710 RCX: 00007f04451d5c6a RDX: 00004000000000c0 RSI: 0000400000000000 RDI: 00007fff281746d0 RBP: 0000000000000000 R08: 00007fff28174710 R09: 0000000000005979 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000004 R13: 0000000001000000 R14: 00004000000000c0 R15: 0000000000000003 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.