INFO: task syz-executor.0:13850 blocked for more than 143 seconds.
      Not tainted 6.1.0-rc1-next-20221021-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:25136 pid:13850 ppid:3066   flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5191 [inline]
 __schedule+0xae9/0x53f0 kernel/sched/core.c:6503
 schedule+0xda/0x1b0 kernel/sched/core.c:6579
 wb_wait_for_completion+0x17e/0x240 fs/fs-writeback.c:191
 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2620
 try_to_writeback_inodes_sb+0x94/0xc0 fs/fs-writeback.c:2668
 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2950
 ext4_da_write_begin+0x16b/0xab0 fs/ext4/inode.c:2977
 generic_perform_write+0x252/0x570 mm/filemap.c:3771
 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285
 ext4_file_write_iter+0x8b8/0x16e0 fs/ext4/file.c:700
 __kernel_write_iter+0x25e/0x730 fs/read_write.c:517
 dump_emit_page fs/coredump.c:862 [inline]
 dump_user_range+0x244/0x680 fs/coredump.c:913
 elf_core_dump+0x26de/0x3510 fs/binfmt_elf.c:2311
 do_coredump+0x26ea/0x3c10 fs/coredump.c:760
 get_signal+0x1be1/0x2430 kernel/signal.c:2844
 arch_do_signal_or_restart+0x75/0x5b0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309
 exc_page_fault+0xbc/0x170 arch/x86/mm/fault.c:1578
 asm_exc_machine_check-0xe/0x40
RIP: 0033:0x0
RSP: 002b:00000000200001c8 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6f715abf80 RCX: 00007f6f7148b5f9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000000
RBP: 00007f6f714e67b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe4740959f R14: 00007f6f7260f300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc1-next-20221021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x32f/0x3c0 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+0xc71/0xfc0 kernel/hung_task.c:377
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8307 Comm: kworker/u4:31 Not tainted 6.1.0-rc1-next-20221021-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:722 [inline]
RIP: 0010:__mod_lruvec_page_state+0x19a/0x3e0 mm/memcontrol.c:841
Code: 0f 8e b5 01 00 00 49 63 9f 80 4b 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc de f0 0b 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 11 02 00 00 49 8b ac de f0 0b 00 00 48 8d bd c0 00 00 00 48
RSP: 0018:ffffc9000a31fa90 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81d025b0
RDX: 1ffff1100b7dd17e RSI: 0000000000000008 RDI: ffff88805bee8bf0
RBP: ffffea00010f3bc0 R08: 0000000000000000 R09: ffffea00010f3bc7
R10: fffff9400021e778 R11: 000000000008c001 R12: 00000000ffffffff
R13: 0000000000000015 R14: ffff88805bee8000 R15: ffff88813fffa000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586c6e8e600 CR3: 000000005ec96000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mod_lruvec_page_state include/linux/vmstat.h:562 [inline]
 lruvec_stat_mod_folio include/linux/vmstat.h:639 [inline]
 __folio_end_writeback+0x829/0xd20 mm/page-writeback.c:2948
 folio_end_writeback+0xdb/0x3b0 mm/filemap.c:1613
 ext4_finish_bio+0x60c/0xbd0 fs/ext4/page-io.c:145
 ext4_release_io_end+0x118/0x3b0 fs/ext4/page-io.c:160
 ext4_end_io_end fs/ext4/page-io.c:194 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x152/0x660 fs/ext4/page-io.c:273
 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>