INFO: task syz-executor.0:5521 blocked for more than 143 seconds.
Not tainted 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:24128 pid:5521 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5307 [inline]
__schedule+0xc91/0x5770 kernel/sched/core.c:6625
schedule+0xde/0x1a0 kernel/sched/core.c:6701
wb_wait_for_completion+0x182/0x240 fs/fs-writeback.c:192
sync_inodes_sb+0x1aa/0xa60 fs/fs-writeback.c:2727
sync_filesystem.part.0+0xe6/0x1d0 fs/sync.c:64
sync_filesystem+0x8f/0xc0 fs/sync.c:43
generic_shutdown_super+0x74/0x480 fs/super.c:473
kill_block_super+0x9b/0xf0 fs/super.c:1407
deactivate_locked_super+0x98/0x160 fs/super.c:331
deactivate_super+0xb1/0xd0 fs/super.c:362
cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1177
task_work_run+0x16f/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x210/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x466eb7
RSP: 002b:00007ffe2a466628 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466eb7
RDX: 00007ffe2a4666f9 RSI: 0000000000000002 RDI: 00007ffe2a4666f0
RBP: 00007ffe2a4666f0 R08: 00000000ffffffff R09: 00007ffe2a4664c0
R10: 0000000002a67893 R11: 0000000000000246 R12: 00000000004af4e4
R13: 00007ffe2a4677a0 R14: 0000000002a67810 R15: 00007ffe2a4677e0
Showing all locks held in the system:
2 locks held by kworker/u4:0/8:
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
#0: ffff888144f6a138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361
#1: ffffc900002efda8 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365
1 lock held by rcu_tasks_kthre/11:
#0: ffffffff8c791ab0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/12:
#0: ffffffff8c7917b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/27:
#0: ffffffff8c792600 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495
2 locks held by getty/4744:
#0: ffff88814b7cd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc900020182f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
2 locks held by syz-executor.0/5521:
#0: ffff8880798880e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa9/0xd0 fs/super.c:361
#1: ffff88801ec8e7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:364 [inline]
#1: ffff88801ec8e7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x190/0xa60 fs/fs-writeback.c:2725
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xe16/0x1090 kernel/hung_task.c:379
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10 Comm: kworker/u4:1 Not tainted 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:match_held_lock+0x1/0xc0 kernel/locking/lockdep.c:5114
Code: 85 c0 75 ae 48 c7 c6 c0 49 4c 8a 48 c7 c7 00 4a 4c 8a e8 42 b0 4b f7 0f 0b eb 97 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 53 <48> 89 fb 48 83 ec 08 48 39 77 10 74 6a 66 f7 47 22 f0 ff 74 5a 48
RSP: 0018:ffffc9000030f948 EFLAGS: 00000097
RAX: 000000000000000a RBX: 0000000000000002 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff8880b983c2d8 RDI: ffff888016ee0d08
RBP: ffff8880b983c2d8 R08: 0000000000000000 R09: ffffffff8e769897
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888016ee0280
R13: ffff888016ee0cb8 R14: 00000000ffffffff R15: ffff888016ee0d08
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa3d44e600 CR3: 000000000c571000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_is_held kernel/locking/lockdep.c:5410 [inline]
lock_is_held_type+0xab/0x140 kernel/locking/lockdep.c:5712
lock_is_held include/linux/lockdep.h:283 [inline]
lockdep_assert_rq_held kernel/sched/sched.h:1357 [inline]
rq_clock_pelt kernel/sched/pelt.h:66 [inline]
cfs_rq_clock_pelt kernel/sched/pelt.h:174 [inline]
update_load_avg+0x2fa/0x1cb0 kernel/sched/fair.c:4187
set_next_entity+0x33d/0x5d0 kernel/sched/fair.c:4992
pick_next_task_fair+0x94b/0x1290 kernel/sched/fair.c:8008
__pick_next_task kernel/sched/core.c:5935 [inline]
pick_next_task kernel/sched/core.c:6010 [inline]
__schedule+0x45b/0x5770 kernel/sched/core.c:6589
schedule+0xde/0x1a0 kernel/sched/core.c:6701
toggle_allocation_gate mm/kfence/core.c:805 [inline]
toggle_allocation_gate+0x1ad/0x230 mm/kfence/core.c:795
process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
worker_thread+0x669/0x1090 kernel/workqueue.c:2537
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308