INFO: task udevd:4757 blocked in I/O wait for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:4757 tgid:4757 ppid:4349 task_flags:0x400140 flags:0x00000000 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 io_schedule+0x1c/0xe0 kernel/sched/core.c:8154 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:250 __wait_on_bit_lock+0xb8/0x1d0 kernel/sched/wait_bit.c:93 out_of_line_wait_on_bit_lock+0x130/0x184 kernel/sched/wait_bit.c:120 wait_on_bit_lock_io include/linux/wait_bit.h:221 [inline] __lock_buffer+0x78/0xa8 fs/buffer.c:68 lock_buffer include/linux/buffer_head.h:434 [inline] block_read_full_folio+0x3bc/0x740 fs/buffer.c:2417 blkdev_read_folio+0x28/0x38 block/fops.c:493 filemap_read_folio+0xf0/0x2fc mm/filemap.c:2516 filemap_update_page mm/filemap.c:2603 [inline] filemap_get_pages+0x12dc/0x1ca8 mm/filemap.c:2733 filemap_read+0x388/0xd04 mm/filemap.c:2820 blkdev_read_iter+0x2a8/0x3cc block/fops.c:830 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x498/0x8c8 fs/read_write.c:574 ksys_read+0x12c/0x228 fs/read_write.c:716 __do_sys_read fs/read_write.c:725 [inline] __se_sys_read fs/read_write.c:723 [inline] __arm64_sys_read+0x84/0x98 fs/read_write.c:723 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800088d171a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088d171a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800088d171a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 2 locks held by kworker/u8:11/2000: 2 locks held by getty/4498: #0: ffff0000c919d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000924fb2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 2 locks held by udevd/4757: #0: ffff0000c1494178 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c1494178 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1494310 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1494310 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1494310 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by udevd/4759: #0: ffff0000c14a9ef8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c14a9ef8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c14aa090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c14aa090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c14aa090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by udevd/4871: #0: ffff0000c1492a78 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c1492a78 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1492c10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1492c10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1492c10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by syz.2.25/5027: 2 locks held by udevd/5033: #0: ffff0000c14935f8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c14935f8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1493790 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1493790 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1493790 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 1 lock held by syz.3.28/5066: 2 locks held by syz.4.29/5112: 2 locks held by udevd/5114: #0: ffff0000c1491378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c1491378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1491510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1491510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1491510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by udevd/5115: #0: ffff0000c14a9378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c14a9378 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c14a9510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c14a9510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c14a9510 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by udevd/5133: #0: ffff0000c1491ef8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c1491ef8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1492090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1492090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1492090 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 2 locks held by udevd/5134: #0: ffff0000c14a87f8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c14a87f8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c14a8990 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c14a8990 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c14a8990 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 1 lock held by syz.5.30/5206: 2 locks held by syz.6.31/5322: 1 lock held by syz.7.34/5372: 1 lock held by syz.8.36/5481: 1 lock held by syz.9.37/5580: 2 locks held by udevd/5587: #0: ffff0000c1495878 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000c1495878 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x298/0x3cc block/fops.c:829 #1: ffff0000c1495a10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1089 [inline] #1: ffff0000c1495a10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_update_page mm/filemap.c:2569 [inline] #1: ffff0000c1495a10 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_get_pages+0x6ec/0x1ca8 mm/filemap.c:2733 1 lock held by syz.0.38/5686: =============================================