Hi Kuai, I see, thanks so much for the explanation! Best, Marius On Mon, 22 Apr 2024 at 23:51, Yu Kuai <yukuai1@xxxxxxxxxxxxxxx> wrote: > > Hi, > > 在 2024/04/21 9:19, Marius Fleischer 写道: > > INFO: task syz-executor.2:32444 blocked for more than 143 seconds. > > Not tainted 6.9.0-rc4-dirty #3 > > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > > task:syz-executor.2 state:D stack:25264 pid:32444 tgid:32417 > > ppid:8232 flags:0x00004006 > > Call Trace: > > <TASK> > > context_switch kernel/sched/core.c:5409 [inline] > > __schedule+0xd23/0x5bc0 kernel/sched/core.c:6746 > > __schedule_loop kernel/sched/core.c:6823 [inline] > > schedule+0xe7/0x350 kernel/sched/core.c:6838 > > io_schedule+0xbf/0x130 kernel/sched/core.c:9044 > > folio_wait_bit_common+0x397/0x9c0 mm/filemap.c:1283 > > folio_put_wait_locked mm/filemap.c:1447 [inline] > > do_read_cache_folio+0x2db/0x520 mm/filemap.c:3729 > > read_mapping_folio include/linux/pagemap.h:894 [inline] > > read_part_sector+0xf7/0x440 block/partitions/core.c:715 > > adfspart_check_POWERTEC+0x82/0x710 block/partitions/acorn.c:454 > > check_partition block/partitions/core.c:138 [inline] > > blk_add_partitions block/partitions/core.c:582 [inline] > > bdev_disk_changed+0x891/0x15f0 block/partitions/core.c:686 > > blkdev_get_whole+0x18b/0x260 block/bdev.c:667 > > bdev_open+0x2eb/0xe90 block/bdev.c:880 > > blkdev_open+0x181/0x200 block/fops.c:620 > > do_dentry_open+0x6d3/0x18e0 fs/open.c:955 > > do_open fs/namei.c:3642 [inline] > > path_openat+0x1b23/0x2670 fs/namei.c:3799 > > do_filp_open+0x1c7/0x410 fs/namei.c:3826 > > do_sys_openat2+0x164/0x1d0 fs/open.c:1406 > > do_sys_open fs/open.c:1421 [inline] > > __do_sys_openat fs/open.c:1437 [inline] > > __se_sys_openat fs/open.c:1432 [inline] > > __x64_sys_openat+0x140/0x1f0 fs/open.c:1432 > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > do_syscall_64+0xce/0x250 arch/x86/entry/common.c:83 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > So this thread hold 'open_mutex' to issued IO to scan partitons, and > such IO never complete, consider that you are using nbd to test, and > nbd doesn't handle timeout by default, I really suspect this is not a > real issue, and this looks like nbd server side doesn't reply to > nbd-client. > > Thanks, > Kuai >
