INFO: task udevd:15064 blocked for more than 143 seconds. Not tainted 5.15.123-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:23872 pid:15064 ppid: 2961 flags:0x00004002 Call Trace: <TASK> context_switch kernel/sched/core.c:5026 [inline] __schedule+0x12c4/0x4590 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 io_schedule+0x88/0x100 kernel/sched/core.c:8472 wait_on_page_bit_common+0xa13/0x1180 mm/filemap.c:1356 wait_on_page_bit mm/filemap.c:1417 [inline] wait_on_page_locked include/linux/pagemap.h:688 [inline] wait_on_page_read mm/filemap.c:3428 [inline] do_read_cache_page+0x9c1/0x1040 mm/filemap.c:3471 read_mapping_page include/linux/pagemap.h:515 [inline] read_part_sector+0xd8/0x530 block/partitions/core.c:727 adfspart_check_ICS+0xd9/0xd00 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions block/partitions/core.c:612 [inline] bdev_disk_changed+0x982/0x1760 block/partitions/core.c:698 blkdev_get_whole+0x2fb/0x390 block/bdev.c:682 blkdev_get_by_dev+0x2b2/0xa50 block/bdev.c:824 blkdev_open+0x138/0x2d0 block/fops.c:463 do_dentry_open+0x807/0xfb0 fs/open.c:826 do_open fs/namei.c:3538 [inline] path_openat+0x2702/0x2f20 fs/namei.c:3672 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_openat fs/open.c:1243 [inline] __se_sys_openat fs/open.c:1238 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1238 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9bafbcd9a4 RSP: 002b:00007ffe24d95750 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000056270be04850 RCX: 00007f9bafbcd9a4 RDX: 00000000000a0800 RSI: 000056270bd2ac60 RDI: 00000000ffffff9c RBP: 000056270bd2ac60 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 000056270bd18750 R14: 0000000000000001 R15: 000056270bd06910 </TASK> INFO: task syz-executor.2:15181 blocked for more than 143 seconds. Not tainted 5.15.123-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27520 pid:15181 ppid: 3556 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5026 [inline] __schedule+0x12c4/0x4590 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6514 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 blkdev_put+0xfb/0x790 block/bdev.c:912 blkdev_close+0x7c/0xa0 block/fops.c:475 __fput+0x3bf/0x890 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:164 get_signal+0x143a/0x14e0 kernel/signal.c:2661 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:172 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fb264324b29 RSP: 002b:00007fb2628a60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007fb264443f80 RCX: 00007fb264324b29 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00007fb26437047a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb264443f80 R15: 00007ffeacca8a18 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8c91e920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3256: #0: ffff888024b04098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900020a32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1da0 drivers/tty/n_tty.c:2147 1 lock held by udevd/15064: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 1 lock held by syz-executor.2/15181: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xfb/0x790 block/bdev.c:912 1 lock held by syz-executor.2/15318: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 1 lock held by syz-executor.2/15319: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 1 lock held by syz-executor.2/15363: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 1 lock held by syz-executor.2/15364: #0: ffff88801b7f5118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x14d/0xa50 block/bdev.c:817 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xe72/0xeb0 kernel/hung_task.c:295 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 32573 Comm: kworker/u4:1 Not tainted 5.15.123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:__lock_release kernel/locking/lockdep.c:5310 [inline] RIP: 0010:lock_release+0x287/0x9a0 kernel/locking/lockdep.c:5642 Code: 8d 5f 24 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 30 84 c0 0f 85 00 05 00 00 83 3b 00 0f 85 19 04 00 00 <4d> 8d 67 20 4c 89 e3 48 c1 eb 03 42 0f b6 04 33 84 c0 48 8b 34 24 RSP: 0018:ffffc900012bfa40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88807ba62924 RCX: ffffc900012bfa03 RDX: 0000000000000002 RSI: ffffffff8c91e920 RDI: ffff88807ba62900 RBP: ffffc900012bfb80 R08: dffffc0000000000 R09: fffffbfff1bc7f0e R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000002 R13: 000000000000000a R14: dffffc0000000000 R15: ffff88807ba62900 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0117db000 CR3: 0000000023846000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> rcu_read_unlock include/linux/rcupdate.h:729 [inline] batadv_nc_process_nc_paths+0x2c2/0x350 net/batman-adv/network-coding.c:703 batadv_nc_worker+0x3d4/0x5b0 net/batman-adv/network-coding.c:732 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 </TASK>