INFO: task syz-executor.3:9305 blocked for more than 143 seconds.
      Not tainted 6.6.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:25528 pid:9305  ppid:7003   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 wb_wait_for_completion+0x1ae/0x270 fs/fs-writeback.c:192
 __writeback_inodes_sb_nr+0x1d8/0x270 fs/fs-writeback.c:2650
 try_to_writeback_inodes_sb+0x97/0xc0 fs/fs-writeback.c:2698
 ext4_nonda_switch+0x1a9/0x1f0 fs/ext4/inode.c:2836
 ext4_da_write_begin+0x16e/0x8c0 fs/ext4/inode.c:2863
 generic_perform_write+0x278/0x600 mm/filemap.c:3942
 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299
 ext4_file_write_iter+0x7f7/0x1860 fs/ext4/file.c:717
 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517
 dump_emit_page fs/coredump.c:888 [inline]
 dump_user_range+0x299/0x790 fs/coredump.c:915
 elf_core_dump+0x2721/0x38e0 fs/binfmt_elf.c:2142
 do_coredump+0x2c96/0x3fc0 fs/coredump.c:764
 get_signal+0x244b/0x27b0 kernel/signal.c:2878
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:309
 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564
RIP: 0033:0x7f537787caf1
RSP: 002b:0000000020000430 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f537799bf80 RCX: 00007f537787cae9
RDX: 0000000020000500 RSI: 0000000020000430 RDI: 0000000000008000
RBP: 00007f53778c847a R08: 0000000020000580 R09: 0000000020000580
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007f537799bf80 R15: 00007fffe141f7a8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfac/0x1230 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 32075 Comm: kworker/u4:0 Not tainted 6.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x70 kernel/kcov.c:207
Code: 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa <65> 8b 05 3d ee 7b 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc900107cf9d0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc900107cfb40 RCX: ffffffff82343a38
RDX: ffff8880787d5940 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff88804cbe2ab0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000010 R11: ffff88802e4e3ff0 R12: ffffc900107cfb4c
R13: 0000000000000010 R14: 0000000000000000 R15: 0000000000000037
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563448e2c600 CR3: 000000000c976000 CR4: 0000000000350ee0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 ext4_map_blocks+0xaf6/0x1770 fs/ext4/inode.c:718
 ext4_convert_unwritten_extents+0x2b7/0x4c0 fs/ext4/extents.c:4810
 ext4_convert_unwritten_io_end_vec+0x127/0x280 fs/ext4/extents.c:4849
 ext4_end_io_end fs/ext4/page-io.c:186 [inline]
 ext4_do_flush_completed_IO fs/ext4/page-io.c:259 [inline]
 ext4_end_io_rsv_work+0x2ca/0x690 fs/ext4/page-io.c:273
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>