INFO: task syz.0.152:6008 blocked for more than 143 seconds.
      Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.152       state:D stack:23680 pid:6008  tgid:6008  ppid:5215   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 request_wait_answer fs/fuse/dev.c:407 [inline]
 __fuse_request_send fs/fuse/dev.c:426 [inline]
 fuse_simple_request+0x1199/0x1b90 fs/fuse/dev.c:513
 fuse_flush+0x69f/0x950 fs/fuse/file.c:542
 filp_flush+0xb5/0x160 fs/open.c:1526
 filp_close+0x1e/0x40 fs/open.c:1539
 __range_close fs/file.c:718 [inline]
 __close_range+0x35e/0x940 fs/file.c:787
 __do_sys_close_range fs/open.c:1592 [inline]
 __se_sys_close_range fs/open.c:1589 [inline]
 __x64_sys_close_range+0x7a/0x90 fs/open.c:1589
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb247779e79
RSP: 002b:00007fff2be582c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007fb247917a80 RCX: 00007fb247779e79
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb247917a80 R08: 0000000000000006 R09: 00007fff2be585af
R10: 00000000003ffc00 R11: 0000000000000246 R12: 00000000000251b6
R13: 00007fff2be583c0 R14: 00007fff2be583e0 R15: ffffffffffffffff
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e7382e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
3 locks held by udevd/4667:
2 locks held by getty/4965:
 #0: ffff88802b2570a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by udevd/5214:
1 lock held by syz.0.152/6013:
1 lock held by syz.0.152/6017:
 #0: ffff88807cfcb9c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x310 fs/file.c:1187

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6023 Comm: syz.0.152 Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:312
Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 c0 d6 03 00 65 8b 05 10 48
RSP: 0018:ffffc90004797d08 EFLAGS: 00000202
RAX: ffffffff815b0ab2 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc9000b376000 RSI: 0000000000000002 RDI: 0000000000000003
RBP: dffffc0000000000 R08: ffffffff815b0aa4 R09: 1ffff920008f2fb6
R10: dffffc0000000000 R11: fffff520008f2fb7 R12: 0000000000000002
R13: ffff88802b355a00 R14: 0000000000000002 R15: 0000000000000002
FS:  00007fb2471bd6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb247916210 CR3: 00000000252d2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 do_sigaltstack+0x347/0x610 kernel/signal.c:4276
 restore_altstack+0x10c/0x150 kernel/signal.c:4328
 __do_sys_rt_sigreturn+0x20d/0x270 arch/x86/kernel/signal_64.c:269
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb247779e79
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:00007fb2471bd0e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007fb2479162e8 RCX: 00007fb247779e79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb2479162e8
RBP: 00007fb2479162e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2479162ec
R13: 0000000000000000 R14: 00007fff2be58080 R15: 00007fff2be58168
 </TASK>