INFO: task syz.3.17:3726 blocked for more than 143 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.17 state:D stack:13432 pid:3726 tgid:3725 ppid:3319 task_flags:0x400548 flags:0x00080001
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x6ca/0x1620 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xac/0x140 kernel/sched/core.c:7026
schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x4b5/0xcc0 kernel/locking/mutex.c:760
io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
io_uring_clean_tctx+0x59/0xc0 io_uring/tctx.c:195
io_uring_cancel_generic+0x28b/0x2d0 io_uring/io_uring.c:3362
io_uring_files_cancel include/linux/io_uring.h:19 [inline]
do_exit+0xa4/0x9a0 kernel/exit.c:912
do_group_exit+0x88/0xa0 kernel/exit.c:1107
get_signal+0x69d/0x740 kernel/signal.c:3034
arch_do_signal_or_restart+0x8a/0x260 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x6d/0xe0 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x181/0x250 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd60898efc9
RSP: 002b:00007fd6097d1038 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: fffffffffffffdfe RBX: 00007fd608be5fa0 RCX: 00007fd60898efc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fd608a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd608be6038 R14: 00007fd608be5fa0 R15: 00007ffe8be1a918
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8397dc30 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8397dc30 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8397dc30 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6775
2 locks held by getty/1884:
#0: ffff8881047800a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1c3/0x6e0 drivers/tty/n_tty.c:2222
1 lock held by syz.3.17/3726:
#0: ffff8881072ce0a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.3.17/3727:
1 lock held by syz.4.18/4137:
#0: ffff888103bb40a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.4.18/4138:
1 lock held by syz.5.19/4549:
#0: ffff888103bb10a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.5.19/4550:
1 lock held by syz.6.20/4961:
#0: ffff8881072da0a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.6.20/4962:
1 lock held by syz.7.21/5373:
#0: ffff8881416e00a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.7.21/5374:
1 lock held by syz.8.22/5785:
#0: ffff8881133a10a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.8.22/5786:
1 lock held by syz.9.23/6197:
#0: ffff8881476de0a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.9.23/6198:
1 lock held by syz.0.24/6609:
#0: ffff8881072df0a8 (&ctx->uring_lock){....}-{3:3}, at: io_uring_del_tctx_node+0x49/0xb0 io_uring/tctx.c:179
3 locks held by syz.0.24/6610:
1 lock held by modprobe/6656:
#0: ffff88813bb2b498 (&rq->__lock){....}-{2:2}, at: raw_spin_rq_lock_nested+0x24/0x100 kernel/sched/core.c:638
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0xa2/0xf0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x109/0x170 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0x573/0x5a0 kernel/hung_task.c:495
kthread+0x203/0x230 kernel/kthread.c:463
ret_from_fork+0xd2/0x1a0 arch/x86/kernel/process.c:158
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: 3727 Comm: syz.3.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__io_uring_show_fdinfo io_uring/fdinfo.c:104 [inline]
RIP: 0010:io_uring_show_fdinfo+0x1b2/0x790 io_uring/fdinfo.c:254
Code: 0a 89 44 24 18 41 8b 17 0f ba e2 10 0f 82 95 01 00 00 49 8b 87 d0 00 00 00 89 e9 21 f1 44 8b 2c 88 41 39 f5 0f 87 74 01 00 00 <49> 8b 9f d8 00 00 00 44 89 e8 8b 4c 24 18 d3 e0 48 c1 e0 06 0f b6
RSP: 0018:ffffc900031dfc08 EFLAGS: 00000293
RAX: ffff888110180040 RBX: ffff88810f2ba040 RCX: 0000000000000082
RDX: 0000000000000008 RSI: 00000000000001ff RDI: 0000000000001000
RBP: 00000000c0d46c82 R08: 00000000fffffffc R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000082 R14: ffff8881043b42b8 R15: ffff8881072ce000
FS: 00007fd6087ff6c0(0000) GS:ffff8881b7306000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5400269e9c CR3: 0000000103752000 CR4: 00000000003506f0
Call Trace:
seq_show+0x18e/0x1d0 fs/proc/fd.c:68
seq_read_iter+0x195/0x480 fs/seq_file.c:230
seq_read+0x132/0x160 fs/seq_file.c:162
vfs_read+0xe2/0x360 fs/read_write.c:570
ksys_read+0x74/0xf0 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd60898efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd6087ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fd608be6090 RCX: 00007fd60898efc9
RDX: 0000000000002020 RSI: 00002000000040c0 RDI: 0000000000000004
RBP: 00007fd608a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd608be6128 R14: 00007fd608be6090 R15: 00007ffe8be1a918