syzbot

INFO: task udevd:12330 blocked for more than 430 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd           state:D stack:0     pid:12330 tgid:12330 ppid:3145   task_flags:0x400140 flags:0x00000011
Call trace:
 __switch_to+0x200/0x500 arch/arm64/kernel/process.c:742 (T)
 context_switch kernel/sched/core.c:5260 [inline]
 __schedule+0xcc8/0x3304 kernel/sched/core.c:6867
 __schedule_loop kernel/sched/core.c:6949 [inline]
 schedule+0xcc/0x350 kernel/sched/core.c:6964
 io_schedule+0xac/0x114 kernel/sched/core.c:7791
 folio_wait_bit_common+0x2b0/0x650 mm/filemap.c:1323
 folio_put_wait_locked mm/filemap.c:1487 [inline]
 do_read_cache_folio+0x238/0x3ec mm/filemap.c:4078
 read_cache_folio+0x44/0x74 mm/filemap.c:4128
 read_mapping_folio include/linux/pagemap.h:1028 [inline]
 read_part_sector+0xa4/0x5e0 block/partitions/core.c:722
 msdos_partition+0xec/0x1f20 block/partitions/msdos.c:592
 check_partition block/partitions/core.c:141 [inline]
 blk_add_partitions block/partitions/core.c:589 [inline]
 bdev_disk_changed+0x4a4/0xe1c block/partitions/core.c:693
 blkdev_get_whole+0x144/0x1f0 block/bdev.c:765
 bdev_open+0x1d4/0xa70 block/bdev.c:974
 blkdev_open+0x270/0x3f0 block/fops.c:698
 do_dentry_open+0x3f0/0x10d4 fs/open.c:962
 vfs_open+0x5c/0x300 fs/open.c:1094
 do_open fs/namei.c:4637 [inline]
 path_openat+0x1734/0x2650 fs/namei.c:4796
 do_filp_open+0x184/0x364 fs/namei.c:4823
 do_sys_openat2+0xec/0x190 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_openat fs/open.c:1452 [inline]
 __se_sys_openat fs/open.c:1447 [inline]
 __arm64_sys_openat+0x130/0x1d0 fs/open.c:1447
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x70/0x260 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x29c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Showing all locks held in the system:
2 locks held by pr/ttyAMA-1/31:
1 lock held by khungtaskd/32:
 #0: ffff800087632120 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x30/0x198 kernel/locking/lockdep.c:6771
2 locks held by getty/3271:
 #0: ffff000017f600a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80008d9fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x420/0xee0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/3325:
3 locks held by kworker/u8:20/8721:
3 locks held by kworker/u8:2/10164:
3 locks held by kworker/u8:3/10820:
1 lock held by udevd/12330:
 #0: ffff0000152f4358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x2b8/0xa70 block/bdev.c:962
2 locks held by kworker/u8:1/12755:
 #0: ffff00000e031148 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x6fc/0x1820 kernel/workqueue.c:3232
 #1: ffff8000a23d7bf0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x720/0x1820 kernel/workqueue.c:3232
3 locks held by kworker/u8:8/13729:
1 lock held by syz.8.3280/14135:
2 locks held by modprobe/14140:

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