INFO: task syz.6.1856:15059 blocked for more than 144 seconds.
Not tainted 6.15.0-rc5-syzkaller-00043-gd76bb1ebb558 #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1856 state:D stack:23960 pid:15059 tgid:15055 ppid:7324 task_flags:0x400548 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 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
io_wq_exit_workers io_uring/io-wq.c:1294 [inline]
io_wq_put_and_exit+0x31b/0x690 io_uring/io-wq.c:1322
io_uring_clean_tctx+0x11f/0x1a0 io_uring/tctx.c:205
io_uring_cancel_generic+0x68f/0x730 io_uring/io_uring.c:3216
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0x56a/0x2550 kernel/exit.c:909
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
get_signal+0x125e/0x1310 kernel/signal.c:3034
arch_do_signal_or_restart+0x95/0x780 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]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218
do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fced538e969
RSP: 002b:00007fced31f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fced55b6088 RCX: 00007fced538e969
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fced55b6088
RBP: 00007fced55b6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fced55b608c
R13: 0000000000000000 R14: 00007ffd706b5680 R15: 00007ffd706b5768
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8df3b860 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
2 locks held by getty/5585:
#0: ffff8880302d40a0 (&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
3 locks held by kworker/u8:11/6151:
2 locks held by kworker/u8:17/6764:
#0: ffff88801e75a148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801e75a148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
#1: ffffc90001597c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc90001597c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
1 lock held by syz-executor/13725:
2 locks held by iou-wrk-15059/15069:
1 lock held by iou-wrk-15059/15070:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
1 lock held by iou-wrk-15059/15071:
1 lock held by iou-wrk-15059/15072:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
1 lock held by iou-wrk-15059/15075:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
1 lock held by iou-wrk-15059/15076:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
1 lock held by iou-wrk-15059/15077:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
1 lock held by iou-wrk-15059/15078:
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:289 [inline]
#0: ffff8880518280a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x7a1/0xa70 io_uring/kbuf.c:562
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc5-syzkaller-00043-gd76bb1ebb558 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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+0x4e/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: 5195 Comm: udevd Not tainted 6.15.0-rc5-syzkaller-00043-gd76bb1ebb558 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:__lock_acquire+0x6d2/0xd20 kernel/locking/lockdep.c:5213
Code: 05 83 bf de 11 0f 83 35 05 00 00 31 c0 48 8b 3c 24 4c 8b b7 e0 0a 00 00 48 83 7c 24 10 00 75 1e 83 3d 91 4e e2 17 00 0f 95 c0 <49> 83 fe ff 0f 94 c1 08 c1 b8 01 00 00 00 0f 84 3d 05 00 00 4d 89
RSP: 0018:ffffc90003cbf7b0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff931dec58
RDX: 0000000000000008 RSI: ffff88807e0ac6f0 RDI: ffff88807e0abc00
RBP: ffff88807e0ac6f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff823639df R12: 0000000000000000
R13: 0000000000000000 R14: ffffffffffffffff R15: ffff88807e0ac6f0
FS: 00007f9ba4a03880(0000) GS:ffff8881261cb000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd1f0382d58 CR3: 0000000027c68000 CR4: 0000000000350ef0
Call Trace:
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
path_init+0x15b/0x1350 fs/namei.c:2536
path_openat+0x18c/0x3830 fs/namei.c:4034
do_filp_open+0x1fa/0x410 fs/namei.c:4066
do_sys_openat2+0x121/0x1c0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1455
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: 0033:0x7f9ba42a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffecc7f7e90 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9ba4a03880 RCX: 00007f9ba42a7407
RDX: 0000000000080241 RSI: 00007ffecc7f8300 RDI: ffffffffffffff9c
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001b6 R11: 0000000000000202 R12: 0000557b9a5c9dfc
R13: 0000557b9a5c9dfc R14: 0000000000000001 R15: 00007ffecc7f81f0