INFO: task syz.4.1469:14303 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1469 state:D stack:21832 pid:14303 tgid:14300 ppid:12913 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5254 [inline]
__schedule+0x17c4/0x4d60 kernel/sched/core.c:6862
__schedule_loop kernel/sched/core.c:6944 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6959
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
io_init_wq_offload io_uring/tctx.c:22 [inline]
io_uring_alloc_task_context+0xff/0x570 io_uring/tctx.c:85
__io_uring_add_tctx_node+0x33e/0x4e0 io_uring/tctx.c:111
__io_uring_add_tctx_node_from_submit+0x91/0x120 io_uring/tctx.c:154
io_uring_add_tctx_node io_uring/tctx.h:32 [inline]
__do_sys_io_uring_enter io_uring/io_uring.c:3545 [inline]
__se_sys_io_uring_enter+0x2553/0x2b80 io_uring/io_uring.c:3489
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f113c38efc9
RSP: 002b:00007f113a5d5038 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00007f113c5e6090 RCX: 00007f113c38efc9
RDX: 0000000000000000 RSI: 00000000000047f9 RDI: 0000000000000003
RBP: 00007f113c411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f113c5e6128 R14: 00007f113c5e6090 R15: 00007fff1061cad8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8df3d5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8df3d5a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8df3d5a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5593:
#0: ffff88814e0dc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900036bb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
6 locks held by kworker/0:7/6824:
#0: ffff88814229ed48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
#0: ffff88814229ed48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
#1: ffffc9000404fba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
#1: ffffc9000404fba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
#2: ffff888143391198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
#2: ffff888143391198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4b50 drivers/usb/core/hub.c:5899
#3: ffff888143394518 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3252 [inline]
#3: ffff888143394518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline]
#3: ffff888143394518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
#3: ffff888143394518 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline]
#3: ffff888143394518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21f2/0x4b50 drivers/usb/core/hub.c:5953
#4: ffff888143344668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5465 [inline]
#4: ffff888143344668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
#4: ffff888143344668 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5871 [inline]
#4: ffff888143344668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x221a/0x4b50 drivers/usb/core/hub.c:5953
#5: ffff8880b863a018 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:638
2 locks held by syz.4.1469/14301:
1 lock held by syz.4.1469/14303:
#0: ffff88807c7a60a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_init_wq_offload io_uring/tctx.c:22 [inline]
#0: ffff88807c7a60a8 (&ctx->uring_lock){+.+.}-{4:4}, at: io_uring_alloc_task_context+0xff/0x570 io_uring/tctx.c:85
=============================================
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+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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:337 [inline]
watchdog+0xfa9/0xff0 kernel/hung_task.c:500
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 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: 14301 Comm: syz.4.1469 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 64 7c d9 0b 48 89 de 5b e9 f3 f2 5a 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 e0 6f 92 65 8b 15 68 b6 af 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000d18f7d8 EFLAGS: 00000a02
RAX: ffffffff82431abe RBX: dffffc0000000000 RCX: 1ffff92001a31f08
RDX: 0000000000000000 RSI: ffffffff8bbe4d20 RDI: ffff8880357e6cb8
RBP: ffffc9000d18f8f8 R08: 00000000ffffffff R09: 0000000000000048
R10: ffffc9000d18f880 R11: fffff52001a31f13 R12: ffff8880357e6cb8
R13: ffff88804d320020 R14: ffffc9000d18f860 R15: ffffffff00000000
FS: 00007f113a5f66c0(0000) GS:ffff888126022000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f269efb12f8 CR3: 000000007919e000 CR4: 00000000003526f0
Call Trace:
seq_printf+0x9e/0x270 fs/seq_file.c:402
__io_uring_show_fdinfo io_uring/fdinfo.c:124 [inline]
io_uring_show_fdinfo+0x573/0x17d0 io_uring/fdinfo.c:256
seq_show+0x5bc/0x730 fs/proc/fd.c:68
seq_read_iter+0x4ef/0xe20 fs/seq_file.c:230
seq_read+0x369/0x480 fs/seq_file.c:162
vfs_read+0x200/0xa30 fs/read_write.c:570
ksys_pread64 fs/read_write.c:763 [inline]
__do_sys_pread64 fs/read_write.c:771 [inline]
__se_sys_pread64 fs/read_write.c:768 [inline]
__x64_sys_pread64+0x193/0x220 fs/read_write.c:768
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f113c38efc9
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:00007f113a5f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007f113c5e5fa0 RCX: 00007f113c38efc9
RDX: 0000000000000063 RSI: 0000200000001200 RDI: 0000000000000005
RBP: 00007f113c411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f113c5e6038 R14: 00007f113c5e5fa0 R15: 00007fff1061cad8