INFO: task kworker/u8:7:3446 blocked for more than 142 seconds.
Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:7 state:D stack:22336 pid:3446 tgid:3446 ppid:2 flags:0x00004000
Workqueue: events_unbound flush_to_ldisc
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
___down_common+0x2d7/0x460 kernel/locking/semaphore.c:225
__down_common kernel/locking/semaphore.c:246 [inline]
__down+0x20/0x30 kernel/locking/semaphore.c:254
down+0x74/0xa0 kernel/locking/semaphore.c:63
console_lock+0x5b/0xa0 kernel/printk/printk.c:2833
do_con_write+0x154/0x7bb0 drivers/tty/vt/vt.c:3056
con_put_char+0x74/0xa0 drivers/tty/vt/vt.c:3442
tty_put_char+0xbc/0x160 drivers/tty/tty_io.c:3167
n_tty_process_echo_ops drivers/tty/n_tty.c:664 [inline]
__process_echoes+0x80a/0xb40 drivers/tty/n_tty.c:709
process_echoes+0xf9/0x1c0 drivers/tty/n_tty.c:789
n_tty_receive_char_flow_ctrl drivers/tty/n_tty.c:1249 [inline]
n_tty_receive_char_special drivers/tty/n_tty.c:1359 [inline]
n_tty_receive_buf_standard+0x1070/0x3180 drivers/tty/n_tty.c:1604
__receive_buf drivers/tty/n_tty.c:1640 [inline]
n_tty_receive_buf_common+0x8ed/0x1980 drivers/tty/n_tty.c:1739
tty_ldisc_receive_buf+0xa2/0x190 drivers/tty/tty_buffer.c:387
tty_port_default_receive_buf+0x70/0xb0 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:445 [inline]
flush_to_ldisc+0x264/0x780 drivers/tty/tty_buffer.c:495
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task kworker/1:5:15960 blocked for more than 142 seconds.
Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:5 state:D stack:23472 pid:15960 tgid:15960 ppid:2 flags:0x00004000
Workqueue: events vc_SAK
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
__mutex_lock_common kernel/locking/mutex.c:665 [inline]
__mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735
tty_buffer_flush+0x72/0x310 drivers/tty/tty_buffer.c:229
tty_ldisc_flush+0x64/0xe0 drivers/tty/tty_ldisc.c:388
__do_SAK+0x6a1/0x800 drivers/tty/tty_io.c:3038
vc_SAK+0x7f/0x310 drivers/tty/vt/vt_ioctl.c:993
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz.3.3793:20657 blocked for more than 142 seconds.
Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.3793 state:D stack:25424 pid:20657 tgid:20657 ppid:16884 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6848
schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
down_write_failed drivers/tty/tty_ldsem.c:262 [inline]
__ldsem_down_write_nested+0x378/0x8d0 drivers/tty/tty_ldsem.c:324
__tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline]
tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:352 [inline]
tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
tty_ldisc_release+0x159/0x2a0 drivers/tty/tty_ldisc.c:780
tty_release_struct+0x23/0xe0 drivers/tty/tty_io.c:1690
tty_release+0xe25/0x1410 drivers/tty/tty_io.c:1861
__fput+0x3f8/0xb60 fs/file_table.c:450
task_work_run+0x14e/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0xad8/0x2d70 kernel/exit.c:938
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3017
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f18e0b85d31
RSP: 002b:00000000fffffe10 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f18e0d75fa0 RCX: 00007f18e0b85d29
RDX: 0000000000000000 RSI: 00000000fffffe10 RDI: 0000000000000000
RBP: 00007f18e0c01b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f18e0d75fa0 R15: 00007ffe1da67288
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xf14/0x1240 kernel/hung_task.c:397
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 22547 Comm: syz.8.4201 Not tainted 6.13.0-rc7-syzkaller-00039-gc3812b15000c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0033:0x7ff0cd85f4b4
Code: 0f 82 b9 00 00 00 48 39 f2 72 6e 41 0f 11 0c 24 48 8b 77 f8 48 89 f8 48 89 eb eb 12 66 2e 0f 1f 84 00 00 00 00 00 48 8b 4b 08 <48> 83 c3 08 48 39 d1 72 f3 48 83 e8 08 48 39 f2 73 17 66 2e 0f 1f
RSP: 002b:00007ffee4983bf0 EFLAGS: 00000297
RAX: 00007ff0cd1f7be8 RBX: 00007ff0cd1e7690 RCX: ffffffff81e17309
RDX: ffffffff81d9ccca RSI: ffffffff81e49c79 RDI: 00007ff0cd2dc4f0
RBP: 00007ff0cd14c270 R08: 00007ff0cd2143a8 R09: 00007ff0cdb62000
R10: 00007ff0ccfff008 R11: 0000000000000005 R12: 00007ff0cd14c268
R13: 0000000000000020 R14: 0000000000000032 R15: 00007ff0ccfff008
FS: 000055558f4c5500 GS: 0000000000000000