syzbot

INFO: task syz-executor967:3604 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor967 state:D stack:25592 pid: 3604 ppid:  3601 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5183 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6495
 schedule+0xda/0x1b0 kernel/sched/core.c:6571
 wb_wait_for_completion+0x17e/0x240 fs/fs-writeback.c:191
 sync_inodes_sb+0x1a6/0x9e0 fs/fs-writeback.c:2706
 sync_filesystem.part.0+0xe6/0x1d0 fs/sync.c:64
 sync_filesystem+0x8b/0xc0 fs/sync.c:43
 generic_shutdown_super+0x70/0x410 fs/super.c:473
 kill_block_super+0x97/0xf0 fs/super.c:1427
 deactivate_locked_super+0x94/0x160 fs/super.c:331
 deactivate_super+0xad/0xd0 fs/super.c:362
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 ptrace_notify+0x114/0x140 kernel/signal.c:2353
 ptrace_report_syscall include/linux/ptrace.h:420 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
 syscall_exit_work kernel/entry/common.c:249 [inline]
 syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:276
 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
 syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5abb4903e7
RSP: 002b:00007ffee7c5b8b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f5abb4903e7
RDX: 00007ffee7c5b97b RSI: 000000000000000a RDI: 00007ffee7c5b970
RBP: 00007ffee7c5b970 R08: 00000000ffffffff R09: 00007ffee7c5b750
R10: 000055555753c653 R11: 0000000000000206 R12: 00007ffee7c5ca30
R13: 000055555753c5f0 R14: 00007ffee7c5b8e0 R15: 00007ffee7c5ca50
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #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+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc18/0xf50 kernel/hung_task.c:369
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4210 Comm: segctord Not tainted 6.0.0-syzkaller-09039-ga6afa4199d3d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x20 kernel/kcov.c:303
Code: 00 00 00 00 00 90 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 9e fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 0c 24 <48> 89 f2 48 89 fe bf 07 00 00 00 e9 7c fe ff ff 66 66 2e 0f 1f 84
RSP: 0018:ffffc90004bd7870 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000002 RCX: ffffffff8426120a
RDX: ffff888026ab1d80 RSI: ffff888073534582 RDI: 0000000000001000
RBP: ffffc90004bd7910 R08: 0000000000000007 R09: 0000000000000002
R10: 0000000000000002 R11: 000000000008c07c R12: ffff888073534582
R13: dffffc0000000000 R14: 0000000000000000 R15: 000000000000003c
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560a8c03f530 CR3: 000000000bc8e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 xa_is_node include/linux/xarray.h:1242 [inline]
 xas_load+0x8a/0x140 lib/xarray.c:237
 mapping_get_entry mm/filemap.c:1858 [inline]
 __filemap_get_folio+0x14e/0xed0 mm/filemap.c:1920
 pagecache_get_page+0x2e/0x290 mm/folio-compat.c:104
 find_get_page_flags include/linux/pagemap.h:569 [inline]
 __find_get_block_slow fs/buffer.c:202 [inline]
 __find_get_block fs/buffer.c:1307 [inline]
 __find_get_block+0x4b5/0xe20 fs/buffer.c:1301
 __getblk_gfp+0x28/0x80 fs/buffer.c:1329
 sb_getblk include/linux/buffer_head.h:363 [inline]
 nilfs_segbuf_extend_segsum+0xda/0x310 fs/nilfs2/segbuf.c:99
 nilfs_segbuf_reset+0x6f/0x1c0 fs/nilfs2/segbuf.c:129
 nilfs_segctor_reset_segment_buffer+0x11d/0x390 fs/nilfs2/segment.c:421
 nilfs_segctor_collect fs/nilfs2/segment.c:1493 [inline]
 nilfs_segctor_do_construct+0x1193/0x6970 fs/nilfs2/segment.c:2039
 nilfs_segctor_construct+0x8e3/0xb30 fs/nilfs2/segment.c:2375
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2483 [inline]
 nilfs_segctor_thread+0x3c3/0xfe0 fs/nilfs2/segment.c:2566
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>