INFO: task kworker/u4:5:1018 blocked for more than 157 seconds. Not tainted 5.15.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:5 state:D stack:23408 pid: 1018 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4969 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6250 schedule+0xd2/0x260 kernel/sched/core.c:6323 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x174/0x270 kernel/sched/completion.c:138 __synchronize_srcu+0x1f2/0x290 kernel/rcu/srcutree.c:930 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:164 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8b980ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6461 3 locks held by khugepaged/33: 1 lock held by in:imklog/6171: 3 locks held by syz-fuzzer/6478: 3 locks held by kworker/1:0/14837: #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888010c67d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc9000598fdb0 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffff88807db89490 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x5d/0xbc0 drivers/net/netdevsim/dev.c:838 7 locks held by kworker/u4:7/21524: #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff8880159d2138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc90001b47db0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 #2: ffffffff8d0e2d10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xb00 net/core/net_namespace.c:555 #3: ffffffff8d121f08 (devlink_mutex){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x75/0x220 net/core/devlink.c:11366 #4: ffff88807bc4d5c0 (&nsim_bus_dev->nsim_bus_reload_lock){+.+.}-{3:3}, at: nsim_dev_reload_down+0x4d/0x180 drivers/net/netdevsim/dev.c:951 #5: ffff88807db89490 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1439 [inline] #5: ffff88807db89490 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0xca/0x300 drivers/net/netdevsim/dev.c:1650 #6: ffffffff8b98a130 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x44/0x440 kernel/rcu/tree.c:3985 2 locks held by syz-executor.1/25556: #0: ffff88807ae0e0e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by syz-executor.5/2996: #0: ffff8880787160e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by syz-executor.3/3377: #0: ffff888035af20e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by kworker/u4:1/7961: #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc9000a367db0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 2 locks held by agetty/23593: #0: ffff8880a4882098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffff8880a4882130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:961 [inline] #1: ffff8880a4882130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:984 [inline] #1: ffff8880a4882130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1110 2 locks held by syz-executor.2/19947: #0: ffff888038f9e0e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 1 lock held by systemd-udevd/23304: 2 locks held by syz-executor.4/24157: #0: ffff88807b78a0e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by syz-executor.0/24607: #0: ffff88808e4b20e0 (&type->s_umount_key#73){+.+.}-{3:3}, at: deactivate_super+0xa5/0xd0 fs/super.c:365 #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker mm/vmscan.c:678 [inline] #1: ffffffff8ba68dd0 (shrinker_rwsem){++++}-{3:3}, at: unregister_shrinker+0x77/0x2f0 mm/vmscan.c:673 2 locks held by kworker/u4:8/24624: #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888010c74138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 #1: ffffc90004317db0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 3 locks held by kworker/0:4/24630: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 23267 Comm: systemd-udevd Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count_sub+0x5f/0x150 kernel/sched/core.c:5468 Code: da 0e 85 c9 75 1b 65 8b 05 ee 21 b3 7e 89 c2 81 e2 ff ff ff 7f 39 da 7c 13 81 fb fe 00 00 00 76 63 f7 db 65 01 1d d1 21 b3 7e <5b> c3 e8 fa 1b 87 02 85 c0 74 f5 48 c7 c0 28 bd 6f 8d 48 ba 00 00 RSP: 0018:ffffc9001739fad0 EFLAGS: 00000297 RAX: 0000000080000001 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f9464f000e7 R08: ffffffff8e824a10 R09: 0000000000000001 R10: fffff52002e73f6f R11: 0000000000086089 R12: ffffc9001739fb00 R13: 0000000000000000 R14: ffff8880704a0240 R15: ffff888014580040 FS: 00007f946608c8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b7342f1780 CR3: 00000001593c8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: is_module_text_address+0x29/0x50 kernel/module.c:4753 kernel_text_address kernel/extable.c:145 [inline] kernel_text_address kernel/extable.c:120 [inline] __kernel_text_address+0x5a/0xc0 kernel/extable.c:105 unwind_get_return_address arch/x86/kernel/unwind_orc.c:318 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc mm/slab.c:3323 [inline] kmem_cache_alloc+0x265/0x560 mm/slab.c:3507 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:323 [inline] getname fs/namei.c:217 [inline] __do_sys_unlink fs/namei.c:4215 [inline] __se_sys_unlink fs/namei.c:4213 [inline] __x64_sys_unlink+0xb1/0x110 fs/namei.c:4213 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9464f000e7 Code: f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 bd 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffeee31d9f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000563e5c0e07d0 RCX: 00007f9464f000e7 RDX: 00007ffeee31d8d0 RSI: 00007ffeee31d8d0 RDI: 00007ffeee31da00 RBP: 00000000000021e6 R08: 00000000000001c0 R09: 0000000000000014 R10: 00007ffeee31da00 R11: 0000000000000246 R12: 00007ffeee31da00 R13: 0000563e5c0e07d0 R14: 0000000000000003 R15: 000000000000000e ---------------- Code disassembly (best guess): 0: da 0e fimull (%rsi) 2: 85 c9 test %ecx,%ecx 4: 75 1b jne 0x21 6: 65 8b 05 ee 21 b3 7e mov %gs:0x7eb321ee(%rip),%eax # 0x7eb321fb d: 89 c2 mov %eax,%edx f: 81 e2 ff ff ff 7f and $0x7fffffff,%edx 15: 39 da cmp %ebx,%edx 17: 7c 13 jl 0x2c 19: 81 fb fe 00 00 00 cmp $0xfe,%ebx 1f: 76 63 jbe 0x84 21: f7 db neg %ebx 23: 65 01 1d d1 21 b3 7e add %ebx,%gs:0x7eb321d1(%rip) # 0x7eb321fb * 2a: 5b pop %rbx <-- trapping instruction 2b: c3 retq 2c: e8 fa 1b 87 02 callq 0x2871c2b 31: 85 c0 test %eax,%eax 33: 74 f5 je 0x2a 35: 48 c7 c0 28 bd 6f 8d mov $0xffffffff8d6fbd28,%rax 3c: 48 rex.W 3d: ba .byte 0xba