syzbot

INFO: task syz-executor115:5879 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor115 state:D stack:28368 pid:5879  tgid:5879  ppid:5832   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6848
 super_lock+0x2bb/0x3f0 fs/super.c:114
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0xb9/0x240 fs/super.c:931
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 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: 0033:0x7f78da4a6ff9
RSP: 002b:00007fff88492158 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f78da4f4038 RCX: 00007f78da4a6ff9
RDX: 00007f78da4a6050 RSI: 0000000000000012 RDI: 00007f78da4f4046
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78da4f4204
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f78da4f445d
R13: 0000000000000001 R14: 00007fff88492190 R15: 0000000000000000
 </TASK>
INFO: task syz-executor115:5880 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor115 state:D stack:28368 pid:5880  tgid:5880  ppid:5831   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6848
 super_lock+0x2bb/0x3f0 fs/super.c:114
 super_lock_shared fs/super.c:139 [inline]
 iterate_supers+0xb9/0x240 fs/super.c:931
 ksys_sync+0x8a/0x150 fs/sync.c:102
 __do_sys_sync+0xe/0x20 fs/sync.c:113
 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: 0033:0x7f78da4a6ff9
RSP: 002b:00007fff88492158 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f78da4f4038 RCX: 00007f78da4a6ff9
RDX: 00007f78da4a6050 RSI: 0000000000000012 RDI: 00007f78da4f4046
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007f78da4f4204
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f78da4f445d
R13: 0000000000000001 R14: 00007fff88492190 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744
2 locks held by getty/5573:
 #0: ffff88814db840a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
1 lock held by syz-executor115/5874:
 #0: ffff88802dd3c0e0 (&type->s_umount_key#67/1){+.+.}-{4:4}, at: alloc_super+0x23d/0xbd0 fs/super.c:344
1 lock held by syz-executor115/5875:
 #0: ffff888143bee0e0 (&type->s_umount_key#67/1){+.+.}-{4:4}, at: alloc_super+0x23d/0xbd0 fs/super.c:344
1 lock held by syz-executor115/5876:
 #0: ffff888143fa20e0 (&type->s_umount_key#67/1){+.+.}-{4:4}, at: alloc_super+0x23d/0xbd0 fs/super.c:344

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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:234 [inline]
 watchdog+0xf14/0x1240 kernel/hung_task.c:397
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 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: 5796 Comm: kworker/0:3 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue:  0x0 (events)
RIP: 0010:put_pwq+0x50/0x130 kernel/workqueue.c:1640
Code: c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 c7 00 00 00 8b 2d 56 97 fd 0e 31 ff 89 ee e8 29 43 38 00 85 ed 75 47 e8 e0 40 38 00 <48> 8d 7b 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f
RSP: 0018:ffffc90003057cb0 EFLAGS: 00000093
RAX: 0000000000000000 RBX: ffff88801b090000 RCX: ffffffff8161d5aa
RDX: ffff88807cc68000 RSI: ffffffff8161d530 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88801b090000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d278f9f680 CR3: 000000000df7e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 process_one_work+0xe51/0x1ba0 kernel/workqueue.c:3284
 process_scheduled_works kernel/workqueue.c:3310 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>