INFO: task syz-executor.0:20939 blocked for more than 143 seconds.
      Not tainted 5.15.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:20856 pid:20939 ppid:     1 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5026 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6372
 schedule+0x11b/0x1f0 kernel/sched/core.c:6455
 rwsem_down_write_slowpath+0xebb/0x15c0 kernel/locking/rwsem.c:1157
 __down_write_common kernel/locking/rwsem.c:1284 [inline]
 __down_write kernel/locking/rwsem.c:1293 [inline]
 down_write+0x164/0x170 kernel/locking/rwsem.c:1542
 inode_lock include/linux/fs.h:787 [inline]
 vfs_unlink+0xe0/0x5f0 fs/namei.c:4198
 do_unlinkat+0x49d/0x940 fs/namei.c:4277
 __do_sys_unlink fs/namei.c:4325 [inline]
 __se_sys_unlink fs/namei.c:4323 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4323
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f83625ac297
RSP: 002b:00007ffedec0d6d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f83625ac297
RDX: 00007ffedec0d700 RSI: 00007ffedec0d790 RDI: 00007ffedec0d790
RBP: 00007ffedec0d790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffedec0e850
R13: 00007f83625f73b9 R14: 000000000020becd R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8c91efe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3275:
 #0: ffff8880242c4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002bb32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
3 locks held by syz-executor.2/21962:
2 locks held by syz-executor.0/22036:
2 locks held by syz-executor.0/22073:
2 locks held by syz-executor.2/22207:
2 locks held by syz-executor.0/22312:
3 locks held by syz-executor.4/22370:

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xe72/0xeb0 kernel/hung_task.c:295
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 22036 Comm: syz-executor.0 Not tainted 5.15.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5e 41 5f 5d c3 48 c7 c7 a2 dd 15 8c eb 0a 48 c7 c7 da dd 15 8c 4c 89 fe e8 6f 5d 51 08 31 db eb d7 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 63 ef ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc90004287338 EFLAGS: 00000286
RAX: ffffffff81b810be RBX: ffffea000171e5f0 RCX: ffffffff81b810d2
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffea000171e5f0
RBP: ffffc90004287570 R08: ffffffff81b810af R09: fffff940002e3cb9
R10: 0000000000000000 R11: dffffc0000000001 R12: 00007f83614a4000
R13: ffffea000171e5c0 R14: ffffea000171e5c8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0cdbd46be CR3: 000000004e358000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 page_mapcount include/linux/mm.h:877 [inline]
 zap_pte_range mm/memory.c:1374 [inline]
 zap_pmd_range mm/memory.c:1494 [inline]
 zap_pud_range mm/memory.c:1523 [inline]
 zap_p4d_range mm/memory.c:1544 [inline]
 unmap_page_range+0x1082/0x2630 mm/memory.c:1565
 unmap_vmas+0x1f8/0x390 mm/memory.c:1642
 exit_mmap+0x3b6/0x670 mm/mmap.c:3186
 __mmput+0x112/0x3b0 kernel/fork.c:1126
 exit_mm+0x688/0x7f0 kernel/exit.c:548
 do_exit+0x626/0x2480 kernel/exit.c:859
 do_group_exit+0x144/0x310 kernel/exit.c:994
 get_signal+0xc66/0x14e0 kernel/signal.c:2889
 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 exc_general_protection+0x358/0x4f0 arch/x86/kernel/traps.c:562
 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:562
RIP: 0033:0x7f83625acaf1
Code: Unable to access opcode bytes at RIP 0x7f83625acac7.
RSP: 002b:0000000020000180 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f83626cbf80 RCX: 00007f83625acae9
RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000008004000
RBP: 00007f83625f847a R08: 0000000020000240 R09: 0000000020000240
R10: 0000000020000200 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f83626cbf80 R15: 00007ffedec0e4b8
 </TASK>