INFO: task syz-executor.1:9750 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:23576 pid:9750  ppid:30031  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5178 [inline]
 __schedule+0x8f3/0xd90 kernel/sched/core.c:6490
 schedule+0xcb/0x190 kernel/sched/core.c:6566
 wb_wait_for_completion+0x165/0x290 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x2f0/0x3d0 fs/fs-writeback.c:2620
 try_to_writeback_inodes_sb+0xa5/0xd0 fs/fs-writeback.c:2668
 ext4_nonda_switch fs/ext4/inode.c:2950 [inline]
 ext4_da_write_begin+0x243/0x760 fs/ext4/inode.c:2977
 generic_perform_write+0x314/0x610 mm/filemap.c:3745
 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285
 ext4_file_write_iter+0x1d0/0x18e0
 __kernel_write_iter+0x323/0x770 fs/read_write.c:517
 dump_emit_page+0xa79/0xca0 fs/coredump.c:857
 dump_user_range+0x5b/0xf0 fs/coredump.c:908
 elf_core_dump+0x3d5b/0x4570 fs/binfmt_elf.c:2311
 do_coredump+0x1854/0x2890 fs/coredump.c:755
 get_signal+0x147e/0x1810 kernel/signal.c:2844
 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:307
 exc_page_fault+0xa2/0x120 arch/x86/mm/fault.c:1557
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x589d88a475e6
RSP: 002b:00000000200000e8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5193babf80 RCX: 00007f5193a8b5a9
RDX: 0000000020000000 RSI: 00000000200000e0 RDI: 0000000040000000
RBP: 00007f5193ae6580 R08: 0000000020000140 R09: 0000000020000140
R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffccbbb72bf R14: 00007f5194c59300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x47c/0x4b0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:377
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2962 Comm: klogd Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:__mutex_lock_common+0x125/0x26c0 kernel/locking/mutex.c:585
Code: 49 8d 7d 60 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 05 e8 65 c7 9a f7 4d 39 6d 60 0f 85 43 1a 00 00 <48> 83 7c 24 10 00 0f 84 80 00 00 00 49 8d 9d 90 00 00 00 48 89 d8
RSP: 0018:ffffc9000d18fa00 EFLAGS: 00000246
RAX: 1ffffffff197f638 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: ffff88807df48000 RSI: 00000000ffffffff RDI: ffffffff8cbfb1c0
RBP: ffffc9000d18fb80 R08: dffffc0000000000 R09: ffffc9000d18fac0
R10: fffff52001a31f5d R11: 1ffff92001a31f58 R12: 0000000000000000
R13: ffffffff8cbfb160 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f7a70c40800(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5193b7f1b8 CR3: 0000000028973000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
 syslog_print+0x2d2/0x620 kernel/printk/printk.c:1531
 do_syslog+0x853/0x950 kernel/printk/printk.c:1682
 __do_sys_syslog kernel/printk/printk.c:1774 [inline]
 __se_sys_syslog kernel/printk/printk.c:1772 [inline]
 __x64_sys_syslog+0x78/0x90 kernel/printk/printk.c:1772
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7a70ddb8b7
Code: 73 01 c3 48 8b 0d c1 05 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 67 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 05 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc47142c08 EFLAGS: 00000206 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007f7a70f68490 RCX: 00007f7a70ddb8b7
RDX: 00000000000003ff RSI: 00007f7a70f68490 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000007 R09: 00005607a4785a60
R10: 0000000000004000 R11: 0000000000000206 R12: 00007f7a70f68490
R13: 00007f7a70f684ea R14: 00007f7a70f684ea R15: 0000000000000000
 </TASK>