INFO: task kworker/1:2:23048 blocked for more than 143 seconds.
Not tainted 5.5.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:2 D26936 23048 2 0x80004000
Workqueue: events kernfs_notify_workfn
Call Trace:
context_switch kernel/sched/core.c:3385 [inline]
__schedule+0x934/0x1f90 kernel/sched/core.c:4081
schedule+0xdc/0x2b0 kernel/sched/core.c:4155
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4214
__mutex_lock_common kernel/locking/mutex.c:1033 [inline]
__mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118
kernfs_notify_workfn+0xe0/0x480 fs/kernfs/file.c:882
process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Showing all locks held in the system:
3 locks held by init/1:
1 lock held by khungtaskd/1121:
#0: ffffffff899a3f00 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 kernel/locking/lockdep.c:5334
3 locks held by rsyslogd/9423:
#0: ffff888091a86868 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
#1: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
#2: ffffffff899a3f00 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline]
#2: ffffffff899a3f00 (rcu_read_lock){....}, at: update_curr+0x2ea/0x8d0 kernel/sched/fair.c:859
3 locks held by cron/9463:
2 locks held by getty/9513:
#0: ffff88809dffa090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000183b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9514:
#0: ffff8880945ca090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9515:
#0: ffff888094be9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000181b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9516:
#0: ffff888094bea090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000184b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9517:
#0: ffff8880a84ba090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000182b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9518:
#0: ffff88809dff9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc9000185b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
2 locks held by getty/9519:
#0: ffff8880a06af090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:340
#1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 drivers/tty/n_tty.c:2156
3 locks held by sshd/9533:
#0: ffff888091ab55a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
#1: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
#2: ffffffff899a3f00 (rcu_read_lock){....}, at: mem_cgroup_iter+0x101/0x5f0 mm/memcontrol.c:1011
4 locks held by syz-fuzzer/9535:
3 locks held by syz-fuzzer/9536:
2 locks held by syz-fuzzer/9537:
#0: ffff888096a083a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
#1: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
1 lock held by syz-fuzzer/9540:
#0: ffff888096a083a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
1 lock held by syz-fuzzer/15681:
#0: ffff888096a083a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
4 locks held by syz-executor.1/9556:
#0: ffff8880a944a9d8 (&mm->mmap_sem#2){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1382 [inline]
#0: ffff8880a944a9d8 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x33c/0xd80 arch/x86/mm/fault.c:1506
#1: ffffffff89a5bee0 (memcg_oom_lock#2){+.+.}, at: mem_cgroup_oom mm/memcontrol.c:1802 [inline]
#1: ffffffff89a5bee0 (memcg_oom_lock#2){+.+.}, at: try_charge+0xa33/0x14d0 mm/memcontrol.c:2504
#2: ffffffff89a18620 (oom_lock){+.+.}, at: mem_cgroup_out_of_memory+0xa4/0x240 mm/memcontrol.c:1569
#3: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
2 locks held by syz-executor.0/16759:
#0: ffff88808ba413e8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
#1: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
3 locks held by kworker/1:2/23048:
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
#0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: process_one_work+0x88b/0x1740 kernel/workqueue.c:2235
#1: ffffc90005537dc0 (kernfs_notify_work){+.+.}, at: process_one_work+0x8c1/0x1740 kernel/workqueue.c:2239
#2: ffffffff89aa3d20 (kernfs_mutex){+.+.}, at: kernfs_notify_workfn+0xe0/0x480 fs/kernfs/file.c:882
3 locks held by kworker/u4:2/24620:
#0: ffff8880ae937358 (&rq->lock){-.-.}, at: newidle_balance+0xa28/0xe80 kernel/sched/fair.c:10177
#1: ffffffff899a3f00 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:5729
#2: ffff8880ae927258 (&base->lock){-.-.}, at: lock_timer_base+0x56/0x1b0 kernel/time/timer.c:936
3 locks held by udevd/29576:
#0: ffff88814980aa00 (&type->i_mutex_dir_key#5){++++}, at: inode_lock_shared include/linux/fs.h:801 [inline]
#0: ffff88814980aa00 (&type->i_mutex_dir_key#5){++++}, at: lookup_slow fs/namei.c:1680 [inline]
#0: ffff88814980aa00 (&type->i_mutex_dir_key#5){++++}, at: walk_component+0x7ad/0xc90 fs/namei.c:1801
#1: ffffffff89aa3d20 (kernfs_mutex){+.+.}, at: kernfs_iop_lookup+0x4f/0x230 fs/kernfs/dir.c:1087
#2: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
1 lock held by syz-executor.1/29997:
#0: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
2 locks held by syz-executor.0/30058:
#0: ffff88808ba413e8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 fs/ext4/inode.c:5976
#1: ffffffff89a40580 (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.0+0x0/0x30 include/linux/uaccess.h:173
2 locks held by kworker/1:1/30061:
#0: ffff8880ae937358 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline]
#0: ffff8880ae937358 (&rq->lock){-.-.}, at: __schedule+0x232/0x1f90 kernel/sched/core.c:4029
#1: ffffffff899a3f00 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline]
#1: ffffffff899a3f00 (rcu_read_lock){....}, at: update_curr+0x2ea/0x8d0 kernel/sched/fair.c:859
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1121 Comm: khungtaskd Not tainted 5.5.0-rc6-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+0x197/0x210 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0xb11/0x10c0 kernel/hung_task.c:289
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 24620 Comm: kworker/u4:2 Not tainted 5.5.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_purge_orig
RIP: 0010:mark_usage kernel/locking/lockdep.c:3583 [inline]
RIP: 0010:__lock_acquire+0x137f/0x4a00 kernel/locking/lockdep.c:3909
Code: 00 00 4c 89 d6 4c 89 df 4c 89 95 40 ff ff ff 4c 89 9d 48 ff ff ff e8 80 d9 ff ff 85 c0 0f 84 87 fe ff ff 4c 8b 9d 48 ff ff ff <48> b8 00 00 00 00 00 fc ff df 4c 8b 95 40 ff ff ff 49 8d bb 80 08
RSP: 0000:ffffc9001434fa50 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 1ffffffff166701e RSI: 0000000000000008 RDI: ffffffff8b3380f0
RBP: ffffc9001434fb68 R08: 1ffffffff165e7b4 R09: fffffbfff165e7b5
R10: fffffbfff165e7b4 R11: ffff88809f5e8380 R12: 000000000000062e
R13: ffff88809f5e8c8a R14: 0000000000000000 R15: 000000000004062e
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76d7a14e40 CR3: 0000000028530000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x33/0x50 kernel/locking/spinlock.c:175
spin_lock_bh include/linux/spinlock.h:343 [inline]
batadv_purge_orig_ref+0x189/0x1360 net/batman-adv/originator.c:1350
batadv_purge_orig+0x1b/0x70 net/batman-adv/originator.c:1379
process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352