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Tue, 03 Dec 2024 18:45:26 -0800 (PST) Date: Tue, 03 Dec 2024 18:45:26 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <674fc246.050a0220.17bd51.005b.GAE@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in sys_symlinkat (5) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 4rzsaqa3fe8gh3pmj8s7g5rce6pgxsh1 X-Rspam-User: X-Rspamd-Queue-Id: 14FBB40005 X-Rspamd-Server: rspam08 X-HE-Tag: 1733280313-912439 X-HE-Meta: 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 V2IA25/p 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 YF83dBWL 9kZIa0hNZDkxRealA53sER9/GxynhDEhwLRcRl+OKzy2cA/iL7fNXPCZRNKa3omzIRKugWKiKntwislkm0UjM9m1wDlpQm2OzX4x73M6nvZY0ufjRM8OSQ29My7uoHh2msufRO8UVMI82VJ/pjVWIBDnjDD7mszAMrg2cceAPD/Rw298tA1y3np+bZlYqD4ZH2+hP0b4KPQE+bdILDH28Sfh0lAVVhYRQ82e6hKfa1eeh5QixoHk6CBUh51HN60HqxHUSXkC5poBkQTllKZ1czXgwOu09+dLdHMt4AqugOLP/qjRA1WG3Vw8T+3KCttJIUCsG/T+bt+dnQCU2CV4C/FBESq/Ea7WcE33sh2cnXRQwclOQ6haQnUxLpPozrYcNIkYqMWoSvDvubEbL1eh0bAEWnh9BSjK X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: cdd30ebb1b9f module: Convert symbol namespace to string li.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10122fc0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=50c7a61469ce77e7 dashboard link: https://syzkaller.appspot.com/bug?extid=9618c3b34a3062164a21 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e29bc9ebf58c/disk-cdd30ebb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/09b856dcfafd/vmlinux-cdd30ebb.xz kernel image: https://storage.googleapis.com/syzbot-assets/2f189038f206/bzImage-cdd30ebb.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9618c3b34a3062164a21@syzkaller.appspotmail.com bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:0d:d1:1f:43:1f, vlan:0) rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17120/1:b..l P5826/1:b..l rcu: (detected by 0, t=10503 jiffies, g=46745, q=1382 ncpus=2) task:syz-executor state:R running task stack:22784 pid:5826 tgid:5826 ppid:5821 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6935 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6959 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1705 [inline] zap_pmd_range mm/memory.c:1753 [inline] zap_pud_range mm/memory.c:1782 [inline] zap_p4d_range mm/memory.c:1803 [inline] unmap_page_range+0x37fa/0x4230 mm/memory.c:1824 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1914 exit_mmap+0x275/0xc20 mm/mmap.c:1667 __mmput+0x115/0x3c0 kernel/fork.c:1353 exit_mm+0x220/0x310 kernel/exit.c:570 do_exit+0x9b2/0x28e0 kernel/exit.c:925 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3017 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f11ba376197 RSP: 002b:00007ffcd6bba000 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 00000000000016dd RCX: 00007f11ba376197 RDX: 0000000040000000 RSI: 00007ffcd6bba03c RDI: 00000000ffffffff RBP: 00007ffcd6bba03c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000008 R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000 task:syz-executor state:R running task stack:26752 pid:17120 tgid:17120 ppid:5855 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7078 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5853 Code: 2b 00 74 08 4c 89 f7 e8 5a ac 8f 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc9000c7274e0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920018e4ea8 RCX: ffff8880261146d8 RDX: dffffc0000000000 RSI: ffffffff8c0aa880 RDI: ffffffff8c5f63e0 RBP: ffffc9000c727630 R08: ffffffff942b8887 R09: 1ffffffff2857110 R10: dffffc0000000000 R11: fffffbfff2857111 R12: 1ffff920018e4ea4 R13: dffffc0000000000 R14: ffffc9000c727540 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] page_ext_get+0x3d/0x2a0 mm/page_ext.c:525 __reset_page_owner+0x30/0x430 mm/page_owner.c:290 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xdef/0x1130 mm/page_alloc.c:2657 discard_slab mm/slub.c:2673 [inline] __put_partials+0xeb/0x130 mm/slub.c:3142 put_cpu_partial+0x17c/0x250 mm/slub.c:3217 __slab_free+0x2ea/0x3d0 mm/slub.c:4468 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_kmalloc+0x23/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4283 [inline] __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] tomoyo_encode2 security/tomoyo/realpath.c:45 [inline] tomoyo_encode+0x26f/0x540 security/tomoyo/realpath.c:80 tomoyo_realpath_from_path+0x59e/0x5e0 security/tomoyo/realpath.c:283 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822 tomoyo_path_symlink+0xde/0x120 security/tomoyo/tomoyo.c:212 security_path_symlink+0x16f/0x370 security/security.c:1979 do_symlinkat+0x136/0x3a0 fs/namei.c:4693 __do_sys_symlinkat fs/namei.c:4711 [inline] __se_sys_symlinkat fs/namei.c:4708 [inline] __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4708 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: 0033:0x7f7d7137f497 RSP: 002b:00007f7d7166fdb8 EFLAGS: 00000206 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7d7137f497 RDX: 00007f7d713f5087 RSI: 00000000ffffff9c RDI: 00007f7d7166fe40 RBP: 00007f7d7166fdec R08: 0000000000000017 R09: 00007f7d7166fb07 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000032 R13: 000000000004e774 R14: 000000000004e76a R15: 00007f7d7166fe40 rcu: rcu_preempt kthread starved for 10574 jiffies! g46745 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26072 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.13.0-rc1-syzkaller-00002-gcdd30ebb1b9f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:refdst_drop include/net/dst.h:262 [inline] RIP: 0010:skb_dst_drop include/net/dst.h:275 [inline] RIP: 0010:br_drop_fake_rtable include/linux/netfilter_bridge.h:24 [inline] RIP: 0010:br_dev_queue_push_xmit+0x1ed/0x900 net/bridge/br_forward.c:39 Code: 8b 74 24 10 eb 70 e8 82 96 06 f7 49 bc 00 00 00 00 00 fc ff df 4c 8b 74 24 10 eb 5a 4c 89 ee 48 83 e6 01 31 ff e8 43 9b 06 f7 <49> 83 e5 01 4c 8b 7c 24 18 48 8b 5c 24 20 75 0f e8 4e 96 06 f7 4c RSP: 0018:ffffc90000156400 EFLAGS: 00000246 RAX: 0000000000000100 RBX: 0000000000000010 RCX: ffff88801d2bda00 RDX: ffff88801d2bda00 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900001564f0 R08: ffffffff8a98dbbd R09: 1ffffffff20328be R10: dffffc0000000000 R11: fffffbfff20328bf R12: 1ffff11030e4419b R13: ffff88805e720f99 R14: ffff88805e720f98 R15: ffff88805e720fd0 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555676e35c8 CR3: 000000002913e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: NF_HOOK+0x700/0x7c0 include/linux/netfilter.h:314 br_nf_post_routing+0xa20/0xe80 net/bridge/br_netfilter_hooks.c:997 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x2a7/0x460 include/linux/netfilter.h:312 br_forward_finish+0xd8/0x130 net/bridge/br_forward.c:66 br_nf_forward_finish+0xb49/0xfb0 net/bridge/br_netfilter_hooks.c:693 NF_HOOK+0x700/0x7c0 include/linux/netfilter.h:314 br_nf_forward_ip+0x61e/0x7b0 net/bridge/br_netfilter_hooks.c:747 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626 nf_hook include/linux/netfilter.h:269 [inline] NF_HOOK+0x2a7/0x460 include/linux/netfilter.h:312 __br_forward+0x489/0x660 net/bridge/br_forward.c:115 deliver_clone net/bridge/br_forward.c:131 [inline] maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190 br_flood+0x2e4/0x660 net/bridge/br_forward.c:236 br_handle_frame_finish+0x18ba/0x1fe0 net/bridge/br_input.c:215 br_nf_hook_thresh+0x472/0x590 br_nf_pre_routing_finish_ipv6+0xaa0/0xdd0 NF_HOOK include/linux/netfilter.h:314 [inline] br_nf_pre_routing_ipv6+0x379/0x770 net/bridge/br_netfilter_ipv6.c:184 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] nf_hook_bridge_pre net/bridge/br_input.c:277 [inline] br_handle_frame+0x9fd/0x1530 net/bridge/br_input.c:424 __netif_receive_skb_core+0x14eb/0x4690 net/core/dev.c:5566 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x12f/0x650 net/core/dev.c:5785 process_backlog+0x662/0x15b0 net/core/dev.c:6117 __napi_poll+0xcb/0x490 net/core/dev.c:6877 napi_poll net/core/dev.c:6946 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7068 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:0d:d1:1f:43:1f, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:0d:d1:1f:43:1f, vlan:0) net_ratelimit: 33548 callbacks suppressed bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:0d:d1:1f:43:1f, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) bridge0: received packet on veth0_to_bridge with own address as source address (addr:f6:0d:d1:1f:43:1f, vlan:0) bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0) --- This report is generated by a bot. 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