syzbot


INFO: task hung in fsnotify_mark_destroy_workfn (3)

Status: auto-closed as invalid on 2020/08/18 06:03
Subsystems: fs
[Documentation on labels]
First crash: 1537d, last: 1495d
Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in fsnotify_mark_destroy_workfn fs syz 13 2145d 2259d 10/27 fixed on 2018/09/08 03:03
upstream INFO: task hung in fsnotify_mark_destroy_workfn (2) fs 42 1712d 2111d 0/27 closed as invalid on 2019/10/23 07:21
linux-4.19 INFO: task hung in fsnotify_mark_destroy_workfn syz done 3 1651d 1838d 1/1 fixed on 2020/01/16 11:28
android-414 INFO: task hung in fsnotify_mark_destroy_workfn 9 1673d 1898d 0/1 auto-closed as invalid on 2020/03/23 16:47
linux-4.19 INFO: task hung in fsnotify_mark_destroy_workfn (2) 1 1528d 1528d 0/1 auto-closed as invalid on 2020/08/15 10:12

Sample crash report:
INFO: task kworker/u4:2:56 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:2    D24544    56      2 0x80004000
Workqueue: events_unbound fsnotify_mark_destroy_workfn
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 mark_held_locks kernel/locking/lockdep.c:3628 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline]
 lockdep_hardirqs_on+0x4a4/0x8a0 kernel/locking/lockdep.c:3702
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __synchronize_srcu+0x1ba/0x240 kernel/rcu/srcutree.c:922
 rcu_read_lock_any_held+0x1a0/0x1a0 arch/x86/include/asm/paravirt.h:754
 fsnotify_mark_destroy_workfn+0xe7/0x2a0 fs/notify/mark.c:832
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 rcu_lock_release+0x20/0x20 include/linux/rcupdate.h:213
 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task kworker/u4:5:245 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:5    D25360   245      2 0x80004000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 mark_held_locks kernel/locking/lockdep.c:3628 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline]
 lockdep_hardirqs_on+0x4a4/0x8a0 kernel/locking/lockdep.c:3702
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __synchronize_srcu+0x1ba/0x240 kernel/rcu/srcutree.c:922
 rcu_read_lock_any_held+0x1a0/0x1a0 arch/x86/include/asm/paravirt.h:754
 fsnotify_connector_destroy_workfn+0x40/0xa0 fs/notify/mark.c:164
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 rcu_lock_release+0x20/0x20 include/linux/rcupdate.h:213
 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task syz-executor.4:28849 blocked for more than 143 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28224 28849   7550 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline]
 do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __flush_work+0xca/0x120 kernel/workqueue.c:3045
 start_flush_work+0x730/0x730 kernel/workqueue.c:3017
 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline]
 p9_conn_destroy net/9p/trans_fd.c:862 [inline]
 p9_fd_close+0x222/0x3a0 net/9p/trans_fd.c:898
 p9_client_create+0x97c/0xef0 net/9p/client.c:1069
 lockdep_init_map_wait include/linux/lockdep.h:330 [inline]
 __raw_spin_lock_init+0x3f/0xf0 kernel/locking/spinlock_debug.c:24
 v9fs_session_init+0x192/0x18f0 fs/9p/v9fs.c:406
 check_preemption_disabled+0x40/0x240 lib/smp_processor_id.c:16
 lock_is_held include/linux/lockdep.h:406 [inline]
 rcu_read_lock_sched_held+0x106/0x170 kernel/rcu/update.c:121
 trace_kmalloc+0xcb/0x120 include/trace/events/kmem.h:46
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 v9fs_mount+0x5c/0x810 fs/9p/vfs_super.c:120
 kmem_cache_alloc_trace+0x24c/0x300 mm/slab.c:3552
 v9fs_mount+0x7f/0x810 fs/9p/vfs_super.c:124
 cap_capable+0x23f/0x280 security/commoncap.c:77
 legacy_get_tree+0xea/0x180 fs/fs_context.c:622
 xfs_fs_commit_blocks+0x630/0x630
 vfs_get_tree+0x88/0x270 fs/super.c:1547
 do_new_mount fs/namespace.c:2816 [inline]
 do_mount+0x17ec/0x2900 fs/namespace.c:3141
 _copy_from_user+0x116/0x170 lib/usercopy.c:16
 __do_sys_mount fs/namespace.c:3350 [inline]
 __se_sys_mount+0xd3/0x100 fs/namespace.c:3327
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
INFO: task syz-executor.1:28845 blocked for more than 144 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D28528 28845   7171 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:650 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:55 [inline]
 do_raw_spin_unlock+0x134/0x8d0 kernel/locking/spinlock_debug.c:139
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __synchronize_srcu+0x1ba/0x240 kernel/rcu/srcutree.c:922
 rcu_read_lock_any_held+0x1a0/0x1a0 arch/x86/include/asm/paravirt.h:754
 mmu_notifier_unregister+0x287/0x370 mm/mmu_notifier.c:838
 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:803 [inline]
 kvm_put_kvm+0x670/0xcb0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:828
 kvm_vcpu_mmap+0x40/0x40 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2942
 kvm_vcpu_release+0x79/0x80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2950
 __fput+0x2ed/0x750 fs/file_table.c:280
 task_work_run+0x147/0x1d0 kernel/task_work.c:123
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:165 [inline]
 prepare_exit_to_usermode+0x48e/0x600 arch/x86/entry/common.c:196
 syscall_return_slowpath+0xf9/0x420 arch/x86/entry/common.c:278
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
INFO: task syz-executor.5:28873 blocked for more than 144 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D26192 28873   7668 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 mark_held_locks kernel/locking/lockdep.c:3628 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline]
 lockdep_hardirqs_on+0x4a4/0x8a0 kernel/locking/lockdep.c:3702
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __flush_work+0xca/0x120 kernel/workqueue.c:3045
 start_flush_work+0x730/0x730 kernel/workqueue.c:3017
 drain_all_pages+0x59d/0x630 mm/page_alloc.c:2995
 __alloc_pages_direct_reclaim mm/page_alloc.c:4217 [inline]
 __alloc_pages_slowpath+0xf49/0x2290 mm/page_alloc.c:4609
 __alloc_pages_nodemask+0x3c2/0x5e0 mm/page_alloc.c:4822
 __alloc_pages include/linux/gfp.h:504 [inline]
 __alloc_pages_node include/linux/gfp.h:517 [inline]
 alloc_pages_vma+0x916/0xd10 mm/mempolicy.c:2239
 mpol_shared_policy_lookup+0x15e/0x200 mm/mempolicy.c:2452
 shmem_alloc_hugepage mm/shmem.c:1469 [inline]
 shmem_alloc_and_acct_page+0x61f/0xbe0 mm/shmem.c:1509
 shmem_getpage_gfp+0x932/0x3120 mm/shmem.c:1825
 iov_iter_advance+0x202/0xf30 lib/iov_iter.c:1074
 shmem_getpage mm/shmem.c:154 [inline]
 shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2486
 generic_perform_write+0x23b/0x4e0 mm/filemap.c:3302
 __generic_file_write_iter+0x22b/0x4e0 mm/filemap.c:3431
 atomic64_set include/asm-generic/atomic-instrumented.h:854 [inline]
 atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
 rwsem_set_owner kernel/locking/rwsem.c:176 [inline]
 __down_write kernel/locking/rwsem.c:1391 [inline]
 down_write+0xcd/0x130 kernel/locking/rwsem.c:1532
 generic_file_write_iter+0x4a6/0x650 mm/filemap.c:3463
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write fs/read_write.c:484 [inline]
 __vfs_write+0x54c/0x710 fs/read_write.c:497
 vfs_write+0x274/0x580 fs/read_write.c:559
 ksys_write+0x11b/0x220 fs/read_write.c:612
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
INFO: task syz-executor.2:28882 blocked for more than 144 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28608 28882   7221 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222
 __mutex_lock_common+0x129f/0x2fc0 kernel/locking/mutex.c:1033
 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1320 [inline]
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline]
 kvm_vm_ioctl+0x923/0x2530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604
 __mutex_lock kernel/locking/mutex.c:1103 [inline]
 mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118
 kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1320 [inline]
 kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline]
 kvm_vm_ioctl+0x923/0x2530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604
 do_vfs_ioctl+0x6ea/0x1910 fs/ioctl.c:741
 kvm_stat_data_clear+0x340/0x340 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4403
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:763 [inline]
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
INFO: task syz-executor.2:28888 blocked for more than 144 seconds.
      Not tainted 5.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29584 28888   7221 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3372 [inline]
 __schedule+0x805/0xc90 kernel/sched/core.c:4088
 schedule+0x188/0x220 kernel/sched/core.c:4163
 schedule_timeout+0x43/0x250 kernel/time/timer.c:1874
 mark_held_locks kernel/locking/lockdep.c:3628 [inline]
 __trace_hardirqs_on_caller kernel/locking/lockdep.c:3657 [inline]
 lockdep_hardirqs_on+0x4a4/0x8a0 kernel/locking/lockdep.c:3702
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
 _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199
 do_wait_for_common+0x232/0x370 kernel/sched/completion.c:85
 console_conditional_schedule+0x30/0x30
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x43/0x50 kernel/sched/completion.c:138
 __synchronize_srcu+0x1ba/0x240 kernel/rcu/srcutree.c:922
 kmalloc include/linux/slab.h:560 [inline]
 kvm_io_bus_register_dev+0x154/0x610 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4207
 rcu_read_lock_any_held+0x1a0/0x1a0 arch/x86/include/asm/paravirt.h:754
 kvm_io_bus_register_dev+0x4ed/0x610 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4228
 kvm_vm_ioctl_register_coalesced_mmio+0x1a1/0x330 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:156
 kvm_vm_ioctl+0x629/0x2530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3634
 do_vfs_ioctl+0x6ea/0x1910 fs/ioctl.c:741
 kvm_stat_data_clear+0x340/0x340 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4403
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl fs/ioctl.c:763 [inline]
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Showing all locks held in the system:
2 locks held by kworker/u4:2/56:
 #0: ffff8880aa434138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: spin_unlock_irq include/linux/spinlock.h:403 [inline]
 #0: ffff8880aa434138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6df/0xfd0 kernel/workqueue.c:2241
 #1: ffffc90000f17d80 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x71e/0xfd0 kernel/workqueue.c:2243
2 locks held by kworker/u4:5/245:
 #0: ffff8880aa434138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: spin_unlock_irq include/linux/spinlock.h:403 [inline]
 #0: ffff8880aa434138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6df/0xfd0 kernel/workqueue.c:2241
 #1: ffffc90001aa7d80 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x71e/0xfd0 kernel/workqueue.c:2243
1 lock held by khungtaskd/1144:
 #0: ffffffff892e8550 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 net/mptcp/pm_netlink.c:858
2 locks held by kworker/0:3/3151:
1 lock held by in:imklog/6710:
 #0: ffff88809aa271b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 fs/file.c:826
4 locks held by syz-executor.5/28873:
 #0: ffff888090610930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x25d/0x2f0 fs/file.c:826
 #1: ffff8880a8ca8450 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2908 [inline]
 #1: ffff8880a8ca8450 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x253/0x580 fs/read_write.c:558
 #2: ffff88803f5e0b50 (&sb->s_type->i_mutex_key#16){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:797 [inline]
 #2: ffff88803f5e0b50 (&sb->s_type->i_mutex_key#16){+.+.}-{3:3}, at: generic_file_write_iter+0x85/0x650 mm/filemap.c:3460
 #3: ffffffff89317528 (pcpu_drain_mutex){+.+.}-{3:3}, at: drain_all_pages+0x54/0x630 mm/page_alloc.c:2950
1 lock held by syz-executor.2/28882:
 #0: ffffc900160390a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1320 [inline]
 #0: ffffc900160390a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_vm_ioctl_set_memory_region arch/x86/kvm/../../../virt/kvm/kvm_main.c:1333 [inline]
 #0: ffffc900160390a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_vm_ioctl+0x923/0x2530 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3604
1 lock held by syz-executor.2/28888:
 #0: ffffc900160390a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_vm_ioctl_register_coalesced_mmio+0x121/0x330 arch/x86/kvm/../../../virt/kvm/coalesced_mmio.c:155

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 1144 Comm: khungtaskd Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101
 arch_trigger_cpumask_backtrace+0x10/0x10 arch/x86/kernel/apic/hw_nmi.c:38
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0xd2a/0xd40 kernel/hung_task.c:289
 kthread+0x353/0x380 kernel/kthread.c:268
 hungtask_pm_notify+0x50/0x50 kernel/hung_task.c:265
 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3151 Comm: kworker/0:3 Not tainted 5.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_read_work
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline]
RIP: 0010:lock_is_held_type+0x25b/0x2e0 kernel/locking/lockdep.c:4973
Code: 48 c1 e8 03 42 80 3c 38 00 74 0c 48 c7 c7 30 b9 2b 89 e8 e8 82 58 00 48 83 3d 70 fc d2 07 00 0f 84 82 00 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 89 e8 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3
RSP: 0018:ffffc90000e37818 EFLAGS: 00000282
RAX: 1ffffffff1257726 RBX: 1ffff1101469ed28 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffff8880a34f6990 RDI: 0000000000000282
RBP: 0000000000000000 R08: ffffffff8632716f R09: 0000000000000000
R10: ffffed101469ec11 R11: 0000000000000000 R12: ffff8880a34f6944
R13: ffffffff892e8520 R14: 0000000000000282 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f758c296000 CR3: 00000000935d9000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_is_held include/linux/lockdep.h:406 [inline]
 ___might_sleep+0x83/0x570 kernel/sched/core.c:6771
 __mutex_lock_common+0x50/0x2fc0 kernel/locking/mutex.c:935
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1528 [inline]
 snd_pcm_oss_read+0xa2a/0xcf0 sound/core/oss/pcm_oss.c:2742
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1490 [inline]
 snd_pcm_oss_read+0x1cf/0xcf0 sound/core/oss/pcm_oss.c:2742
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1528 [inline]
 snd_pcm_oss_read+0xa2a/0xcf0 sound/core/oss/pcm_oss.c:2742
 atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:1463 [inline]
 atomic_long_cmpxchg_release include/asm-generic/atomic-long.h:424 [inline]
 __mutex_unlock_slowpath+0x12d/0x580 kernel/locking/mutex.c:1249
 __mutex_lock kernel/locking/mutex.c:1103 [inline]
 mutex_lock_interruptible_nested+0x1a/0x20 kernel/locking/mutex.c:1140
 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1490 [inline]
 snd_pcm_oss_read+0x1cf/0xcf0 sound/core/oss/pcm_oss.c:2742
 snd_pcm_oss_unregister_minor+0x240/0x240 sound/core/oss/pcm_oss.c:2947
 __vfs_read+0xa7/0x700 fs/read_write.c:426
 vfs_read+0x1c4/0x400 fs/read_write.c:462
 kernel_read+0xa3/0xf0 fs/read_write.c:441
 p9_fd_read net/9p/trans_fd.c:263 [inline]
 p9_read_work+0x322/0xec0 net/9p/trans_fd.c:298
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 rcu_lock_release+0x20/0x20 include/linux/rcupdate.h:213
 kthread_blkcg+0xd0/0xd0 kernel/kthread.c:1247
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/04/23 11:09 upstream c578ddb39e56 2e44d63e .config console log report ci-upstream-kasan-gce-smack-root
2020/04/20 08:39 upstream 0fe5f9ca2235 9f7c6d12 .config console log report ci-upstream-kasan-gce-root
2020/04/20 08:32 upstream 0fe5f9ca2235 9f7c6d12 .config console log report ci-upstream-kasan-gce-smack-root
2020/04/17 12:20 upstream 7a56db0299f9 18397578 .config console log report ci-upstream-kasan-gce-root
2020/04/15 00:27 upstream 8632e9b5645b 3f3c5574 .config console log report ci-upstream-kasan-gce-root
2020/04/14 18:20 upstream 8f3d9f354286 3f3c5574 .config console log report ci-upstream-kasan-gce-smack-root
2020/04/11 02:50 upstream ab6f762f0f53 a8c6a3f8 .config console log report ci-upstream-kasan-gce-selinux-root
2020/04/11 02:38 upstream ab6f762f0f53 a8c6a3f8 .config console log report ci-upstream-kasan-gce-root
2020/05/20 05:54 linux-next ac935d227366 67fa1f59 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/19 15:40 linux-next ac935d227366 6d882fd2 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/05/11 06:15 linux-next ac935d227366 8742a2b9 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/04/23 14:57 linux-next ac935d227366 2e44d63e .config console log report ci-upstream-linux-next-kasan-gce-root
2020/04/20 08:36 linux-next ac935d227366 9f7c6d12 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/04/10 09:42 linux-next 0434e521ce3b a8c6a3f8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/04/09 00:23 linux-next 5798bd75ab13 db9bcd4b .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.