INFO: task syz-executor.1:8529 blocked for more than 143 seconds.
Not tainted 6.1.75-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:21192 pid:8529 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5245 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6558
schedule+0xbf/0x180 kernel/sched/core.c:6634
wb_wait_for_completion+0x162/0x290 fs/fs-writeback.c:191
sync_inodes_sb+0x28f/0xb10 fs/fs-writeback.c:2739
sync_filesystem+0x16b/0x220 fs/sync.c:64
generic_shutdown_super+0x6b/0x340 fs/super.c:474
kill_block_super+0x7a/0xe0 fs/super.c:1459
deactivate_locked_super+0xa0/0x110 fs/super.c:332
cleanup_mnt+0x490/0x520 fs/namespace.c:1186
task_work_run+0x246/0x300 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc71c27f0d7
RSP: 002b:00007ffc96575f88 EFLAGS: 00000246
ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fc71c27f0d7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffc96576040
RBP: 00007ffc96576040 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc96577100
R13: 00007fc71c2c93b9 R14: 000000000018c453 R15: 0000000000000004
Showing all locks held in the system:
4 locks held by kworker/u4:0/9:
#0:
ffff8880146f6938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#1: ffffc900000e7d20 ((work_completion)(&(&wb->dwork)->work)
){+.+.}-{0:0}
, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
#2:
ffff88807853a650
(
sb_internal
#3
){.+.+}-{0:0}
, at: xfs_bmapi_convert_delalloc+0x263/0x12d0 fs/xfs/libxfs/xfs_bmap.c:4521
#3:
ffff8880868d8118
(
&xfs_nondir_ilock_class
){++++}-{3:3}, at: xfs_bmapi_convert_delalloc+0x291/0x12d0 fs/xfs/libxfs/xfs_bmap.c:4526
1 lock held by rcu_tasks_kthre/12:
#0:
ffffffff8d12a490
(
rcu_tasks.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0:
ffffffff8d12ac90
(
rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0:
ffffffff8d12a2c0
(
rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:318 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:759 [inline]
, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
2 locks held by getty/3305:
#0:
ffff8880286e6098
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1:
ffffc900031332f0
(
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
5 locks held by kworker/0:20/27958:
2 locks held by syz-executor.1/8529:
#0:
ffff88807853a0e0
(
&type->s_umount_key
#61
){+.+.}-{3:3}
, at: deactivate_super+0xa9/0xe0 fs/super.c:362
#1:
ffff8881437ac7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline]
ffff8881437ac7d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x270/0xb10 fs/fs-writeback.c:2737
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.75-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: writeback wb_workfn (flush-7:1)
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:203
Code: e8 25 00 00 00 0f 0b 0f 1f 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 88 b6 e8 0c 48 89 de 5b e9 c7 81 56 00 cc cc cc cc cc cc cc <48> 8b 04 24 65 48 8b 0d 14 fc 77 7e 65 8b 15 15 fc 77 7e f7 c2 00
RSP: 0018:ffffc900000e6490 EFLAGS: 00000093
RAX: ffffffff818aa4e5 RBX: 0000000000000000 RCX: ffff88813fea8000
RDX: 0000000000000000 RSI: ffffffff91cc8e20 RDI: 0000000000000000
RBP: ffffc900000e6690 R08: ffffffff84af89df R09: fffffbfff2091c45
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff91cc65c0
R13: ffffffff92010400 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f90872666c0 CR3: 000000007d92b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
wq_watchdog_touch+0xe/0x110 kernel/workqueue.c:5893
touch_nmi_watchdog include/linux/nmi.h:137 [inline]
serial8250_console_write+0xd4/0x1750 drivers/tty/serial/8250/8250_port.c:3405
call_console_driver kernel/printk/printk.c:1942 [inline]
console_emit_next_record+0xb09/0xea0 kernel/printk/printk.c:2742
console_unlock+0x278/0x7c0 kernel/printk/printk.c:2871
vprintk_emit+0x523/0x740 kernel/printk/printk.c:2268
_printk+0xd1/0x111 kernel/printk/printk.c:2293
__xfs_printk fs/xfs/xfs_message.c:24 [inline]
xfs_printk_level+0x1c6/0x310 fs/xfs/xfs_message.c:44
xfs_discard_folio+0x2b1/0x7b0 fs/xfs/xfs_aops.c:469
iomap_writepage_map fs/iomap/buffered-io.c:1389 [inline]
iomap_do_writepage+0x2432/0x3110 fs/iomap/buffered-io.c:1518
write_cache_pages+0x92e/0x15c0 mm/page-writeback.c:2360
iomap_writepages+0x64/0x240 fs/iomap/buffered-io.c:1535
xfs_vm_writepages+0x127/0x180 fs/xfs/xfs_aops.c:500
do_writepages+0x3a2/0x670 mm/page-writeback.c:2469
__writeback_single_inode+0x15d/0x11e0 fs/fs-writeback.c:1612
writeback_sb_inodes+0xc2b/0x1b20 fs/fs-writeback.c:1903
wb_writeback+0x49d/0xe10 fs/fs-writeback.c:2077
wb_do_writeback fs/fs-writeback.c:2220 [inline]
wb_workfn+0x427/0x1020 fs/fs-writeback.c:2260
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306