INFO: task syz-executor.0:17682 blocked for more than 143 seconds.
Not tainted 6.3.0-rc2-syzkaller-00077-g38e04b3e4240 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:27256 pid:17682 ppid:5128 flags:0x00024000
Call Trace:
context_switch kernel/sched/core.c:5304 [inline]
__schedule+0xc91/0x5770 kernel/sched/core.c:6622
schedule+0xde/0x1a0 kernel/sched/core.c:6698
schedule_timeout+0x276/0x2b0 kernel/time/timer.c:2143
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x1ce/0x5c0 kernel/sched/completion.c:106
io_wq_exit_workers io_uring/io-wq.c:1265 [inline]
io_wq_put_and_exit+0x273/0xec0 io_uring/io-wq.c:1300
io_uring_clean_tctx+0x10e/0x190 io_uring/tctx.c:193
io_uring_cancel_generic+0x566/0x690 io_uring/io_uring.c:3260
io_uring_files_cancel include/linux/io_uring.h:55 [inline]
do_exit+0x54f/0x2960 kernel/exit.c:824
do_group_exit+0xd4/0x2a0 kernel/exit.c:1019
get_signal+0x2315/0x25b0 kernel/signal.c:2859
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8165a8c0f9
RSP: 002b:00007f8166736168 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 00000000000002ff RBX: 00007f8165babf80 RCX: 00007f8165a8c0f9
RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000004
RBP: 00007f8165ae7b39 R08: 0000000000000000 R09: 000000001e000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff4c38562f R14: 00007f8166736300 R15: 0000000000022000
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8c794b70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8c794870 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
#0: ffffffff8c7956c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495
2 locks held by getty/4760:
#0: ffff88802be24098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#1:
ffffc900015b02f0
(
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
6 locks held by kworker/0:0/5131:
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
#0: ffff8881451ad138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361
#1: ffffc9000471fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365
#2: ffff8881470c0190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline]
#2: ffff8881470c0190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4e40 drivers/usb/core/hub.c:5739
#3:
ffff8881470c34f8
(
&port_dev->status_lock){+.+.}-{3:3}, at: raw_spin_rq_lock_nested+0x2f/0x120 kernel/sched/core.c:539
#4: ffff88802be16fb0 (&mm->cid_lock#2){....}-{2:2}, at: mm_cid_get kernel/sched/sched.h:3280 [inline]
#4: ffff88802be16fb0 (&mm->cid_lock#2){....}-{2:2}, at: switch_mm_cid kernel/sched/sched.h:3302 [inline]
#4: ffff88802be16fb0 (&mm->cid_lock#2){....}-{2:2}, at: prepare_task_switch kernel/sched/core.c:5114 [inline]
#4: ffff88802be16fb0 (&mm->cid_lock#2){....}-{2:2}, at: context_switch kernel/sched/core.c:5255 [inline]
#4: ffff88802be16fb0 (&mm->cid_lock#2){....}-{2:2}, at: __schedule+0x2802/0x5770 kernel/sched/core.c:6622
#5: ffffffff91f96ea8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x132/0x3e0 lib/debugobjects.c:665
2 locks held by kworker/u4:18/17542:
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361
#1: ffffc9000338fda8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365
2 locks held by kworker/u4:20/17544:
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361
#1: ffffc900033bfda8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365
2 locks held by kworker/u4:23/17547:
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:639 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:666 [inline]
#0: ffff888012479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x87a/0x15c0 kernel/workqueue.c:2361
#1: ffffc900033dfda8 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x15c0 kernel/workqueue.c:2365
4 locks held by iou-wrk-17682/17693:
2 locks held by syz-executor.5/29339:
#0:
ffff88801e882460 (sb_writers#15){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1323 [inline]
ffff88801e882460 (sb_writers#15){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1309 [inline]
ffff88801e882460 (sb_writers#15){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1309
#1: ffff8880b993c298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2f/0x120 kernel/sched/core.c:539
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc2-syzkaller-00077-g38e04b3e4240 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xe16/0x1090 kernel/hung_task.c:379
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17693 Comm: iou-wrk-17682 Not tainted 6.3.0-rc2-syzkaller-00077-g38e04b3e4240 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:475
Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 18 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 e8 55 93 51 fd eb a4 e8 ae 93 51 fd eb e1 66
RSP: 0018:ffffc9000391f448 EFLAGS: 00000002
RAX: 000000000000005d RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff84825a65 RDI: ffffffff92076760
RBP: ffffffff92076720 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000005d R14: ffffffff84825a00 R15: 0000000000000000
FS: 00007f8166736700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fec39ddd718 CR3: 000000006f4c7000 CR4: 0000000000350ee0
Call Trace:
serial_out drivers/tty/serial/8250/8250.h:123 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3371 [inline]
serial8250_console_write+0xd12/0x1010 drivers/tty/serial/8250/8250_port.c:3442
console_emit_next_record kernel/printk/printk.c:2886 [inline]
console_flush_all+0x49c/0xcc0 kernel/printk/printk.c:2942
console_unlock+0xb8/0x1f0 kernel/printk/printk.c:3016
vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2316
vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50
_printk+0xbf/0xf0 kernel/printk/printk.c:2337
device_read+0x13f7/0x16d0 fs/dlm/user.c:820
loop_rw_iter+0x1c2/0x5c0 io_uring/rw.c:464
io_iter_do_read io_uring/rw.c:648 [inline]
io_iter_do_read io_uring/rw.c:641 [inline]
io_read+0x101a/0x1420 io_uring/rw.c:769
io_issue_sqe+0x15d/0x1250 io_uring/io_uring.c:1907
io_wq_submit_work+0x29c/0xdb0 io_uring/io_uring.c:1983
io_worker_handle_work+0xa39/0x1a00 io_uring/io-wq.c:587
io_wqe_worker+0x9f2/0xdb0 io_uring/io-wq.c:632
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308