INFO: task udevd:6449 blocked for more than 430 seconds. Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:0 pid:6449 tgid:6449 ppid:3103 flags:0x00000005 Call trace: __switch_to+0x1c8/0x2a4 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5188 [inline] __schedule+0xacc/0x2920 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xd0/0x304 kernel/sched/core.c:6621 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6678 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x4e8/0x840 kernel/locking/mutex.c:752 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:804 bdev_open+0x2c4/0xa84 block/bdev.c:897 blkdev_open+0x24c/0x37c block/fops.c:630 do_dentry_open+0x50c/0x1068 fs/open.c:959 vfs_open+0x5c/0x2fc fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x16dc/0x2380 fs/namei.c:3886 do_filp_open+0x16c/0x330 fs/namei.c:3913 do_sys_openat2+0x12c/0x160 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __arm64_sys_openat+0x12c/0x1b8 fs/open.c:1442 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 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+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800086c62ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x44/0x2d4 kernel/locking/lockdep.c:6620 1 lock held by klogd/3092: 2 locks held by getty/3221: #0: ffff0000193c80a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80008cc2b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x93c/0xe9c drivers/tty/n_tty.c:2211 1 lock held by syz-executor/3277: 1 lock held by syz.1.1087/6447: #0: ffff000015f924c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x104/0x510 block/bdev.c:1080 1 lock held by syz.1.1087/6448: #0: ffff000015f924c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x104/0x510 block/bdev.c:1080 1 lock held by syz.1.1087/6453: #0: ffff000015f924c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x2c4/0xa84 block/bdev.c:897 1 lock held by udevd/6449: #0: ffff000015f924c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x2c4/0xa84 block/bdev.c:897 2 locks held by syz-executor/6537: 2 locks held by syz.0.1894/8562: #0: ffff00001de79e48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:810 [inline] #0: ffff00001de79e48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1734 [inline] #0: ffff00001de79e48 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x1e0/0x484 fs/namei.c:2039 #1: ffff00001de7a310 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xa0/0xd8 fs/fuse/inode.c:554 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:119 dump_stack+0x1c/0x28 lib/dump_stack.c:128 nmi_cpu_backtrace+0x1b0/0x274 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x25c/0x300 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x18/0x24 arch/arm64/kernel/smp.c:926 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xa74/0xd40 kernel/hung_task.c:379 kthread+0x27c/0x300 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 1 Comm: init Not tainted 6.11.0-rc6-syzkaller-00019-g67784a74e258 #0 Hardware name: linux,dummy-virt (DT) pstate: 40000000 (nZcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0000ffffa6d94318 lr : 0000ffffa6e11678 sp : 0000ffffd6104f50 x29: 0000ffffd6104f50 x28: 0000000000000000 x27: 0000ffffd6105408 x26: 0000000000000000 x25: 0000000000001989 x24: 0000ffffa6e37000 x23: 0000ffffa6e37000 x22: 0000ffffa6e75000 x21: 0000ffffa6e68000 x20: 0000ffffa6e69000 x19: 0000ffffa6e379b8 x18: 000000000000270f x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000064 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 000000000000000e x9 : fff80002c8e43150 x8 : 0101010101010101 x7 : 61762f01716d7575 x6 : 7f7f7f7f7f7f7f7f x5 : 0000000000000000 x4 : 0000000000000000 x3 : 000000000000002f x2 : 000000000000002f x1 : 0000ffffa6e379d8 x0 : 0000ffffa6e379c8