INFO: task syz.1.11092:10920 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.11092     state:D stack:28464 pid:10920 tgid:10918 ppid:5819   task_flags:0x400640 flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:264
 coredump_wait fs/coredump.c:419 [inline]
 do_coredump+0x86f/0x4410 fs/coredump.c:576
 get_signal+0x230b/0x26c0 kernel/signal.c:3021
 arch_do_signal_or_restart+0x90/0x7e0 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+0x150/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb7da4e750
RSP: 002b:00007fcb7ea8d338 EFLAGS: 00000246 ORIG_RAX: 0000000000000120
RAX: 0000000000000000 RBX: 00007fcb7dda5fa0 RCX: 00007fcb7db8d169
RDX: 00007fcb7ea8d340 RSI: 00007fcb7ea8d470 RDI: 000000000000000b
RBP: 00007fcb7dc0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fcb7dda5fa0 R15: 00007ffd12bee6c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
2 locks held by getty/5574:
 #0: ffff8880325ff0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0xf62/0x12b0 kernel/hung_task.c:399
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5805 Comm: syz-executor Not tainted 6.14.0-rc7-syzkaller-00196-g88d324e69ea9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
RIP: 0010:__se_sys_clock_nanosleep kernel/time/posix-timers.c:1379 [inline]
RIP: 0010:__x64_sys_clock_nanosleep+0x34a/0x4a0 kernel/time/posix-timers.c:1379
Code: 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 26 01 00 00 48 8b 45 30 4c 89 f2 44 89 ee 8b 7c 24 04 ff d0 0f 1f 00 48 63 e8 <eb> 07 48 c7 c5 ea ff ff ff e8 78 45 10 00 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc90003787e78 EFLAGS: 00000282
RAX: 0000000000000000 RBX: 1ffff920006f0fd2 RCX: 1ffffffff20c4511
RDX: 0000000000000000 RSI: ffffffff8b6cfc80 RDI: ffffffff8bd36a20
RBP: 0000000000000000 R08: fffff520006f0f8e R09: 0000000000000001
R10: ffffffff90626c17 R11: 0000000000000000 R12: ffff8880123ec880
R13: 0000000000000000 R14: ffffc90003787eb0 R15: ffffffff8b700a50
FS:  000055557fe85500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f064317b338 CR3: 00000000298e6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53f1bbf9e3
Code: 1f 84 00 00 00 00 00 83 ff 03 74 7b 83 ff 02 b8 fa ff ff ff 49 89 ca 0f 44 f8 80 3d 5e db 1b 00 00 74 14 b8 e6 00 00 00 0f 05 <f7> d8 c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec 28 48 89 54 24 10
RSP: 002b:00007fff41041e18 EFLAGS: 00000202 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f53f1bbf9e3
RDX: 00007fff41041e30 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 000000000009e412 R09: 00007f53f298b000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007fff41042280
R13: 0000000000000004 R14: 00007fff41041e6c R15: 00007fff41041f00
 </TASK>