INFO: task udevd:7377 blocked in I/O wait for more than 143 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:7377 tgid:7377 ppid:4343 task_flags:0x400140 flags:0x00800011 Call trace: __switch_to+0x2b4/0x6e4 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5520 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7362 io_schedule+0x1c/0xe0 kernel/sched/core.c:8190 folio_wait_bit_common+0x6b8/0xa30 mm/filemap.c:1329 folio_put_wait_locked mm/filemap.c:1498 [inline] do_read_cache_folio+0x23c/0x5a8 mm/filemap.c:4138 read_cache_folio+0x68/0x88 mm/filemap.c:4188 read_mapping_folio include/linux/pagemap.h:1015 [inline] read_part_sector+0xcc/0x708 block/partitions/core.c:724 adfspart_check_POWERTEC+0x94/0x5b8 block/partitions/acorn.c:451 check_partition block/partitions/core.c:143 [inline] blk_add_partitions block/partitions/core.c:591 [inline] bdev_disk_changed+0x6e4/0x1224 block/partitions/core.c:695 blkdev_get_whole+0x15c/0x240 block/bdev.c:793 bdev_open+0x2b4/0x880 block/bdev.c:1002 blkdev_open+0x2d4/0x408 block/fops.c:674 do_dentry_open+0x5c4/0xfc0 fs/open.c:996 vfs_open+0x44/0x2dc fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x1084/0x18f4 fs/namei.c:5000 do_file_open+0x1c8/0x2e8 fs/namei.c:5029 do_sys_openat2+0x114/0x1e8 fs/open.c:1417 do_sys_open+0xb0/0xe0 fs/open.c:1423 __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __arm64_sys_openat+0xa8/0xc4 fs/open.c:1434 __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: locks held by khungtaskd/31: 1, last CPU#0: #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6837 locks held by kworker/u8:3/49: 3, last CPU#0: #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3362 [inline] #0: ffff0000c004c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3470 #1: ffff800090347c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3362 [inline] #1: ffff800090347c40 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3470 #2: ffff0000fd319258 (&devlink->lock_key#10){+.+.}-{4:4}, at: devl_trylock+0x24/0x34 net/devlink/core.c:314 locks held by kworker/u8:10/3033: 2, last CPU#0: #0: ffff0000cc682940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3362 [inline] #0: ffff0000cc682940 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_scheduled_works+0x8c8/0x1250 kernel/workqueue.c:3470 #1: ffff8000998f7c40 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3362 [inline] #1: ffff8000998f7c40 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8d0/0x1250 kernel/workqueue.c:3470 locks held by udevd/4343: 1, last CPU#0: #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: sock_def_readable+0xdc/0x6f4 net/core/sock.c:3655 locks held by getty/4491: 2, on CPU#0: #0: ffff0000cd7a00a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000925de2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 locks held by udevd/4703: 2, on CPU#0: #0: ffff0000d1e28460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: lookup_open+0x1cc/0x1180 fs/namei.c:4458 locks held by udevd/4933: 2, on CPU#0: #0: ffff0000d1e28460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: lookup_open+0x1cc/0x1180 fs/namei.c:4458 locks held by udevd/7377: 1, on CPU#0: #0: ffff0000c730e350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:990 locks held by udevd/7404: 1, last CPU#0: #0: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline] #0: ffff0000d1fbe910 (&type->i_mutex_dir_key#5){++++}-{4:4}, at: lookup_open+0x1bc/0x1180 fs/namei.c:4460 locks held by dhcpcd/7534: 1, on CPU#0: #0: ffff0000f0bd0240 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #0: ffff0000f0bd0240 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: __sock_release+0x7c/0x1d4 net/socket.c:734 locks held by syz-executor/8778: 3, on CPU#0: #0: ffff0000d3bbc460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000f3acde20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline] #1: ffff0000f3acde20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: __start_dirop+0xa0/0xf4 fs/namei.c:2918 #2: ffff0000f3ac8380 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #2: ffff0000f3ac8380 (&type->i_mutex_dir_key#3){++++}-{4:4}, at: vfs_rmdir+0x118/0x590 fs/namei.c:5500 locks held by udevd/11073: 2, on CPU#0: #0: ffff0000d1e28460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:494 #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline] #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: lock_rename fs/namei.c:3785 [inline] #1: ffff0000d1fbe910 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: __start_renaming+0x144/0x344 fs/namei.c:3878 locks held by syz.1.1093/11509: 1, on CPU#0: #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline] #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1a8/0x46c mm/util.c:579 locks held by syz.1.1093/11512: 1, last CPU#0: #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline] #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x14c/0x294 mm/madvise.c:1781 locks held by syz.1.1093/11534: 2, last CPU#0: #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline] #0: ffff0000d245ba78 (&mm->mmap_lock){++++}-{4:4}, at: madvise_lock+0x14c/0x294 mm/madvise.c:1781 #1: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #1: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffff800088de2060 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x4c/0x224 mm/pgtable-generic.c:290 locks held by syz.8.1101/11531: 1, on CPU#0: #0: ffff800088de76e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline] #0: ffff800088de76e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x30c/0x66c kernel/rcu/tree_exp.h:966 =============================================