syzbot

INFO: task syz-executor123:3634 blocked for more than 143 seconds.
      Tainted: G        W         5.17.0-syzkaller-01442-gb47d5a4f6b8d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor123 state:D stack:28160 pid: 3634 ppid:  3633 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4995 [inline]
 __schedule+0xa94/0x4910 kernel/sched/core.c:6304
 schedule+0xd2/0x1f0 kernel/sched/core.c:6376
 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common+0x2af/0x360 kernel/sched/completion.c:106
 io_wq_exit_workers fs/io-wq.c:1264 [inline]
 io_wq_put_and_exit+0x4d6/0xe40 fs/io-wq.c:1299
 io_uring_clean_tctx fs/io_uring.c:10512 [inline]
 io_uring_cancel_generic+0x60b/0x695 fs/io_uring.c:10582
 io_uring_files_cancel include/linux/io_uring.h:18 [inline]
 do_exit+0x4f9/0x29d0 kernel/exit.c:761
 do_group_exit+0xd2/0x2f0 kernel/exit.c:936
 __do_sys_exit_group kernel/exit.c:947 [inline]
 __se_sys_exit_group kernel/exit.c:945 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:945
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa616b7dbd9
RSP: 002b:00007ffd0ba19358 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa616bf2350 RCX: 00007fa616b7dbd9
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa616bf2350
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Tainted: G        W         5.17.0-syzkaller-01442-gb47d5a4f6b8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:369
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3635 Comm: iou-wrk-3634 Tainted: G        W         5.17.0-syzkaller-01442-gb47d5a4f6b8d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__ldsem_down_read_nested+0x32/0x850 drivers/tty/tty_ldsem.c:297
Code: ff df 41 57 41 56 41 89 f6 41 55 41 54 49 89 fc 55 4d 8d 7c 24 70 48 89 d5 53 48 81 ec c8 00 00 00 48 c7 44 24 28 b3 8a b5 41 <4c> 8d 6c 24 28 48 c7 44 24 30 c8 4d 47 8b 49 c1 ed 03 48 c7 44 24
RSP: 0018:ffffc9000115f718 EFLAGS: 00000296
RAX: dffffc0000000000 RBX: ffff88814a2bd000 RCX: 0000000000000000
RDX: 7fffffffffffffff RSI: 0000000000000000 RDI: ffff88814a2bd028
RBP: 7fffffffffffffff R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff843a08bd R11: 0000000000000000 R12: ffff88814a2bd028
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88814a2bd098
FS:  000055555665d300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555665d2c0 CR3: 0000000072dfd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 tty_read+0x1a2/0x5d0 drivers/tty/tty_io.c:928
 call_read_iter include/linux/fs.h:2068 [inline]
 io_iter_do_read fs/io_uring.c:3789 [inline]
 io_read+0x330/0x12a0 fs/io_uring.c:3859
 io_issue_sqe+0x813/0x8390 fs/io_uring.c:7172
 io_wq_submit_work+0x1ed/0x590 fs/io_uring.c:7340
 io_worker_handle_work+0xad6/0x1b30 fs/io-wq.c:595
 io_wqe_worker+0x606/0xd40 fs/io-wq.c:642
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.426 msecs
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	df 41 57             	filds  0x57(%rcx)
   3:	41 56                	push   %r14
   5:	41 89 f6             	mov    %esi,%r14d
   8:	41 55                	push   %r13
   a:	41 54                	push   %r12
   c:	49 89 fc             	mov    %rdi,%r12
   f:	55                   	push   %rbp
  10:	4d 8d 7c 24 70       	lea    0x70(%r12),%r15
  15:	48 89 d5             	mov    %rdx,%rbp
  18:	53                   	push   %rbx
  19:	48 81 ec c8 00 00 00 	sub    $0xc8,%rsp
  20:	48 c7 44 24 28 b3 8a 	movq   $0x41b58ab3,0x28(%rsp)
  27:	b5 41
* 29:	4c 8d 6c 24 28       	lea    0x28(%rsp),%r13 <-- trapping instruction
  2e:	48 c7 44 24 30 c8 4d 	movq   $0xffffffff8b474dc8,0x30(%rsp)
  35:	47 8b
  37:	49 c1 ed 03          	shr    $0x3,%r13
  3b:	48                   	rex.W
  3c:	c7                   	.byte 0xc7
  3d:	44                   	rex.R
  3e:	24                   	.byte 0x24