INFO: task syz.4.469:7894 blocked for more than 143 seconds.
      Not tainted 6.11.0-syzkaller-11624-ge477dba5442c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.469       state:D stack:25184 pid:7894  tgid:7866  ppid:7161   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5315 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6675
 __schedule_loop kernel/sched/core.c:6752 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6767
 io_schedule+0x8d/0x110 kernel/sched/core.c:7552
 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309
 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189
 folio_prepare_writeback mm/page-writeback.c:2455 [inline]
 writeback_get_folio mm/page-writeback.c:2497 [inline]
 writeback_iter+0xb18/0x18d0 mm/page-writeback.c:2590
 write_cache_pages+0xb1/0x230 mm/page-writeback.c:2639
 bch2_writepages+0x14f/0x380 fs/bcachefs/fs-io-buffered.c:639
 do_writepages+0x35f/0x870 mm/page-writeback.c:2683
 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398
 __filemap_fdatawrite_range mm/filemap.c:431 [inline]
 filemap_write_and_wait_range+0x192/0x280 mm/filemap.c:685
 bch2_extend fs/bcachefs/fs-io.c:378 [inline]
 bchfs_truncate+0x64b/0xc70 fs/bcachefs/fs-io.c:431
 notify_change+0xbcc/0xe90 fs/attr.c:503
 do_truncate+0x220/0x310 fs/open.c:65
 vfs_truncate+0x2e1/0x3b0 fs/open.c:111
 do_sys_truncate+0xdb/0x190 fs/open.c:134
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f68e577df39
RSP: 002b:00007f68e6555038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 00007f68e5936058 RCX: 00007f68e577df39
RDX: 0000000000000000 RSI: 000000000000f000 RDI: 0000000020000080
RBP: 00007f68e57f0216 R08: 0000000000000000 R09: 0000000000000000