INFO: task kworker/u8:2:36 blocked for more than 143 seconds.
Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:22200 pid:36 tgid:36 ppid:2 task_flags:0x4248060 flags:0x00004000
Workqueue: xfs-cil/loop2 xlog_cil_push_work
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:229 [inline]
__down_common+0x319/0x6a0 kernel/locking/semaphore.c:250
down+0x80/0xd0 kernel/locking/semaphore.c:64
xfs_buf_lock+0x15d/0x4d0 fs/xfs/xfs_buf.c:996
xfs_buf_item_unpin+0x1ce/0x6c0 fs/xfs/xfs_buf_item.c:468
xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline]
xlog_cil_committed+0x7c0/0xe70 fs/xfs/xfs_log_cil.c:904
xlog_cil_push_work+0x1f47/0x2570 fs/xfs/xfs_log_cil.c:1525
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz-executor287:6270 blocked for more than 144 seconds.
Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor287 state:D stack:27432 pid:6270 tgid:6222 ppid:5819 task_flags:0x400140 flags:0x00000006
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x168f/0x4c70 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:148
__flush_workqueue+0x6f7/0x14b0 kernel/workqueue.c:4000
xlog_cil_push_now fs/xfs/xfs_log_cil.c:1643 [inline]
xlog_cil_force_seq+0x22a/0x8f0 fs/xfs/xfs_log_cil.c:1845
xfs_log_force_seq+0x196/0x440 fs/xfs/xfs_log.c:3098
__xfs_trans_commit+0x7d2/0xbd0 fs/xfs/xfs_trans.c:905
xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:954
xfs_sync_sb_buf+0x134/0x230 fs/xfs/libxfs/xfs_sb.c:1474
xfs_ioc_setlabel fs/xfs/xfs_ioctl.c:1046 [inline]
xfs_file_ioctl+0x1536/0x1870 fs/xfs/xfs_ioctl.c:1203
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee36b38fc9
RSP: 002b:00007fee36acc218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fee36bca6d8 RCX: 00007fee36b38fc9
RDX: 0000200000000080 RSI: 0000000041009432 RDI: 0000000000000004
RBP: 00007fee36bca6d0 R08: 00007ffe6c3e54e7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fee36b96a38
R13: 18bea1116aa755e3 R14: 0000200000000088 R15: 0000200000000080
Showing all locks held in the system:
2 locks held by kworker/0:0/9:
#0: ffff88803474e548 ((wq_completion)xfs-sync/loop2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88803474e548 ((wq_completion)xfs-sync/loop2){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc900000e7c60 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900000e7c60 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
1 lock held by khungtaskd/31:
#0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:2/36:
#0: ffff8880256d3948 ((wq_completion)xfs-cil/loop2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff8880256d3948 ((wq_completion)xfs-cil/loop2){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc90000ad7c60 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90000ad7c60 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
3 locks held by udevd/5187:
2 locks held by getty/5582:
#0: ffff88814d03c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
1 lock held by udevd/5834:
1 lock held by syz-executor287/6270:
#0: ffff88807e6e4420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200 fs/namespace.c:600
1 lock held by syz-executor287/6693:
#0: ffff8880502b2420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200 fs/namespace.c:600
1 lock held by syz-executor287/10138:
#0: ffff88807ac50420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200 fs/namespace.c:600
2 locks held by syz-executor287/10148:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:437
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10148 Comm: syz-executor287 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:409
Code: e8 ee e7 88 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 8f bc e8 fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07
RSP: 0018:ffffc9000b41e910 EFLAGS: 00000002
RAX: 1ffffffff3364300 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffffff99b21c90 R08: ffff888024310237 R09: 1ffff11004862046
R10: dffffc0000000000 R11: ffffffff853708a0 R12: dffffc0000000000
R13: 0000000000000000 R14: ffffffff99b21a00 R15: 0000000000000000
FS: 00007fee36aed6c0(0000) GS:ffff8881261f6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566b58778 CR3: 0000000021fd2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:137 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
wait_for_lsr+0x19e/0x2f0 drivers/tty/serial/8250/8250_port.c:2098
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3348 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3371 [inline]
serial8250_console_write+0x134c/0x1ba0 drivers/tty/serial/8250/8250_port.c:3456
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x728/0xc40 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xc4/0x270 kernel/printk/printk.c:3325
vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450
_printk+0xcf/0x120 kernel/printk/printk.c:2475
set_capacity_and_notify+0x208/0x2d0 block/genhd.c:93
loop_set_size+0x44/0xb0 drivers/block/loop.c:210
loop_configure+0xb96/0x1010 drivers/block/loop.c:1067
lo_ioctl+0x79a/0x2410 drivers/block/loop.c:-1
blkdev_ioctl+0x5a5/0x6d0 block/ioctl.c:704
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee36b38e5b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fee36aed030 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fee36aed0a0 RCX: 00007fee36b38e5b
RDX: 0000000000000003 RSI: 0000000000004c00 RDI: 0000000000000004
RBP: 0000200000009840 R08: 0000000000000000 R09: 00000000000098ce
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000009800
R13: 00007fee36aed0e0 R14: 0000000000000003 R15: 0000000000000040