INFO: task syz.2.40:6093 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-11125-g609706855d90 #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.40 state:D stack:24520 pid:6093 tgid:6092 ppid:5860 task_flags:0x400448 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x1b88/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_timeout+0xb1/0x2b0 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+0x32f/0x600 kernel/sched/completion.c:148
io_wq_exit_workers io_uring/io-wq.c:1294 [inline]
io_wq_put_and_exit+0x374/0x750 io_uring/io-wq.c:1322
io_uring_clean_tctx+0x16a/0x1e0 io_uring/tctx.c:205
io_uring_cancel_generic+0x74f/0x800 io_uring/io_uring.c:3210
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0x685/0x2950 kernel/exit.c:910
do_group_exit+0x207/0x2c0 kernel/exit.c:1103
get_signal+0x1696/0x1730 kernel/signal.c:3035
arch_do_signal_or_restart+0x98/0x840 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+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1a3618d169
RSP: 002b:00007f1a33ff60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f1a363a5fa8 RCX: 00007f1a3618d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1a363a5fa8
RBP: 00007f1a363a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1a363a5fac
R13: 0000000000000000 R14: 00007f1a364cf940 R15: 00007f1a364cfa28
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8ed3b560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8ed3b560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8ed3b560 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x180 kernel/locking/lockdep.c:6764
2 locks held by kworker/u8:10/3553:
#0: ffff88801db21148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801db21148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
#1: ffffc9000cda7c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc9000cda7c60 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
2 locks held by getty/5593:
#0: ffff88814d9e50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x53d/0x16b0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5828:
1 lock held by iou-wrk-6093/6107:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6111:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6112:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6113:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6114:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6115:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6116:
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_ring_submit_lock io_uring/io_uring.h:290 [inline]
#0: ffff88802d71e0a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_provide_buffers+0x701/0x980 io_uring/kbuf.c:560
1 lock held by iou-wrk-6093/6117:
1 lock held by syz.1.687/8393:
#0: ffffffff8ed40940 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
1 lock held by syz.5.688/8396:
#0: ffffffff8ed40940 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3774
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-11125-g609706855d90 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x4ab/0x4e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7b7/0x940 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: 6292 Comm: syz-executor Not tainted 6.14.0-syzkaller-11125-g609706855d90 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:do_wait+0x3/0x510 kernel/exit.c:1696
Code: 8b 3c 24 e8 1f ab a8 00 e9 40 ff ff ff e8 e5 cf a9 0a 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 <41> 56 41 55 41 54 53 48 83 ec 40 49 89 fd 49 bf 00 00 00 00 00 fc
RSP: 0018:ffffc9000c83fc48 EFLAGS: 00000246
RAX: 1ffff92001907f98 RBX: 1ffff92001907f97 RCX: ffff8880268fbc00
RDX: ffffc9000c83fca0 RSI: ffffffff8ebdc9d0 RDI: ffffc9000c83fca0
RBP: ffffc9000c83fd70 R08: 0000000000000005 R09: ffffffff8183cc0d
R10: 0000000000000002 R11: ffff8880268fbc00 R12: dffffc0000000000
R13: 1ffff92001907f90 R14: 0000000000000000 R15: ffffffff9366f020
FS: 0000555555ed3500(0000) GS:ffff8881250b1000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8853d79178 CR3: 000000007e260000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kernel_wait4+0x2ac/0x3c0 kernel/exit.c:1866
__do_sys_wait4 kernel/exit.c:1894 [inline]
__se_sys_wait4 kernel/exit.c:1890 [inline]
__x64_sys_wait4+0x136/0x1e0 kernel/exit.c:1890
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86b0b833d7
Code: 89 7c 24 10 48 89 4c 24 18 e8 45 1b 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 95 1b 03 00 8b 44
RSP: 002b:00007f86b0ecfd80 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 0000000000000192 RCX: 00007f86b0b833d7
RDX: 0000000040000001 RSI: 00007f86b0ecfdec RDI: 00000000ffffffff
RBP: 00007f86b0ecfdec R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000044852 R15: 00007f86b0ecfe40