INFO: task syz-executor.4:5043 blocked for more than 143 seconds.
Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4 state:D stack:24504 pid:5043 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5343 [inline]
__schedule+0xc9a/0x5880 kernel/sched/core.c:6669
schedule+0xde/0x1a0 kernel/sched/core.c:6745
io_schedule+0xbe/0x130 kernel/sched/core.c:8979
folio_wait_bit_common+0x394/0x9b0 mm/filemap.c:1301
folio_wait_writeback+0x3b/0x250 mm/page-writeback.c:3087
__filemap_fdatawait_range+0x10f/0x210 mm/filemap.c:525
filemap_fdatawait_keep_errors+0x21/0x30 mm/filemap.c:620
wait_sb_inodes fs/fs-writeback.c:2611 [inline]
sync_inodes_sb+0x5e3/0xa60 fs/fs-writeback.c:2733
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+0xa1/0x100 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: 0033:0x7fd2e1a8d7f7
RSP: 002b:00007fff6c07ba48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fd2e1a8d7f7
RDX: 00007fff6c07bb1b RSI: 000000000000000a RDI: 00007fff6c07bb10
RBP: 00007fff6c07bb10 R08: 00000000ffffffff R09: 00007fff6c07b8e0
R10: 0000555556799893 R11: 0000000000000246 R12: 00007fd2e1ad643b
R13: 00007fff6c07cbd0 R14: 0000555556799810 R15: 00007fff6c07cc10
Showing all locks held in the system:
2 locks held by kworker/u4:0/10:
1 lock held by rcu_tasks_kthre/13:
#0: ffffffff8c7984b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
#0: ffffffff8c7981b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/28:
#0: ffffffff8c7990c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6559
2 locks held by getty/4750:
#0: ffff8880284e3098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2176
2 locks held by syz-executor.4/5043:
#0: ffff88802861e0e0 (&type->s_umount_key#61){+.+.}-{3:3}, at: deactivate_super+0xa9/0xd0 fs/super.c:361
#1: ffff88802861e990 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2550 [inline]
#1: ffff88802861e990 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x225/0xa60 fs/fs-writeback.c:2733
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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+0x344/0x440 kernel/kthread.c:379
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: 0 Comm: swapper/0 Not tainted 6.4.0-rc6-syzkaller-00049-g62d8779610bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_preemption_disabled+0x22/0x170 lib/smp_processor_id.c:16
Code: 00 00 00 0f 1f 44 00 00 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 91 0c f3 75 65 8b 1d 86 0c f3 75 <81> e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44
RSP: 0018:ffffffff8c407c48 EFLAGS: 00000083
RAX: 0000000000000001 RBX: 0000000080000002 RCX: ffffffff8165f16c
RDX: 0000000000000000 RSI: ffffffff8aa719c0 RDI: ffffffff8aa71a00
RBP: ffffffff8aa71a00 R08: 0000000000000000 R09: ffffffff8e7a8ed7
R10: fffffbfff1cf51da R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8aa719c0 R14: ffffffff8c7c4248 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0005ad000 CR3: 000000000c571000 CR4: 0000000000350ef0
Call Trace:
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x12/0xb0 kernel/rcu/tree.c:695
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x470/0x520 kernel/locking/lockdep.c:5676
seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline]
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x14b/0x470 kernel/time/timekeeping.c:848
tick_nohz_start_idle+0xc0/0x1e0 kernel/time/tick-sched.c:675
tick_nohz_idle_enter+0x135/0x1d0 kernel/time/tick-sched.c:1161
do_idle+0x82/0x3c0 kernel/sched/idle.c:256
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
rest_init+0x16f/0x2b0 init/main.c:735
arch_call_rest_init+0x13/0x30 init/main.c:834
start_kernel+0x3b6/0x490 init/main.c:1088
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
x86_64_start_kernel+0xb3/0xc0 arch/x86/kernel/head64.c:537
secondary_startup_64_no_verify+0xf4/0xfb