INFO: task udevd:10214 blocked for more than 143 seconds. Not tainted 5.19.0-rc5-syzkaller-00257-g5867f3b88bb5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:24840 pid:10214 ppid: 2976 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5146 [inline] __schedule+0xa00/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 io_schedule+0xba/0x130 kernel/sched/core.c:8645 folio_wait_bit_common+0x4f2/0xa90 mm/filemap.c:1324 folio_wait_bit mm/filemap.c:1473 [inline] folio_wait_locked include/linux/pagemap.h:1028 [inline] folio_wait_locked include/linux/pagemap.h:1025 [inline] do_read_cache_folio+0x4ff/0x760 mm/filemap.c:3530 do_read_cache_page mm/filemap.c:3602 [inline] read_cache_page+0x59/0x2a0 mm/filemap.c:3611 read_mapping_page include/linux/pagemap.h:759 [inline] read_part_sector+0xf6/0x920 block/partitions/core.c:715 adfspart_check_ICS+0x9a/0x690 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:600 [inline] bdev_disk_changed block/partitions/core.c:686 [inline] bdev_disk_changed+0x629/0xf60 block/partitions/core.c:653 blkdev_get_whole+0x18a/0x2d0 block/bdev.c:686 blkdev_get_by_dev.part.0+0x5ec/0xb90 block/bdev.c:823 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:857 blkdev_open+0x13c/0x2c0 block/fops.c:481 do_dentry_open+0x4a1/0x11f0 fs/open.c:848 do_open fs/namei.c:3520 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3653 do_filp_open+0x1aa/0x400 fs/namei.c:3680 do_sys_openat2+0x16d/0x4c0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1305 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f55cb525697 RSP: 002b:00007fffe77ff180 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000562d22be4dc0 RCX: 00007f55cb525697 RDX: 00000000000a0800 RSI: 0000562d22bbf850 RDI: 00000000ffffff9c RBP: 0000562d22bbf850 R08: 0000000000000001 R09: 00007fffe79ab080 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 0000562d22bc7b70 R14: 0000000000000001 R15: 0000562d22bbe910 Showing all locks held in the system: 1 lock held by khungtaskd/28: #0: ffffffff8bd866a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 2 locks held by getty/3287: #0: ffff88814a6df098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002d232e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xe50/0x13c0 drivers/tty/n_tty.c:2124 1 lock held by udevd/10214: #0: ffff88801d6e7118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:814 3 locks held by kworker/u4:14/12366: #0: ffff8880b9a39ed8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:544 #1: ffffc9000594fda8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff8880b9a28398 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x5a/0x1f0 kernel/time/timer.c:999 1 lock held by syz-executor.0/25993: #0: ffff88801d6e7118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xbc/0x770 block/bdev.c:912 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 5.19.0-rc5-syzkaller-00257-g5867f3b88bb5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 5.19.0-rc5-syzkaller-00257-g5867f3b88bb5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:lock_is_held_type+0xeb/0x140 kernel/locking/lockdep.c:5710 Code: 45 31 ed 44 39 f0 41 0f 94 c5 48 c7 c7 60 7d cc 89 e8 69 0d 00 00 b8 ff ff ff ff 65 0f c1 05 24 22 8b 76 83 f8 01 75 29 9c 58 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 44 89 RSP: 0018:ffffc90000147c68 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000 RBP: ffffffff8bd865e0 R08: 0000000000000000 R09: ffffffff8dbba1d7 R10: fffffbfff1b7743a R11: 0000000000000001 R12: ffff888011a83b00 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888011a84560 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f86356de990 CR3: 000000000ba8e000 CR4: 0000000000350ef0 Call Trace: lock_is_held include/linux/lockdep.h:279 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x480/0x570 kernel/locking/lockdep.c:5636 seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline] timekeeping_get_delta kernel/time/timekeeping.c:253 [inline] timekeeping_get_ns kernel/time/timekeeping.c:387 [inline] ktime_get_update_offsets_now+0x14d/0x5c0 kernel/time/timekeeping.c:2317 hrtimer_update_base kernel/time/hrtimer.c:631 [inline] hrtimer_run_softirq+0x87/0x360 kernel/time/hrtimer.c:1765 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 ---------------- Code disassembly (best guess): 0: 45 31 ed xor %r13d,%r13d 3: 44 39 f0 cmp %r14d,%eax 6: 41 0f 94 c5 sete %r13b a: 48 c7 c7 60 7d cc 89 mov $0xffffffff89cc7d60,%rdi 11: e8 69 0d 00 00 callq 0xd7f 16: b8 ff ff ff ff mov $0xffffffff,%eax 1b: 65 0f c1 05 24 22 8b xadd %eax,%gs:0x768b2224(%rip) # 0x768b2247 22: 76 23: 83 f8 01 cmp $0x1,%eax 26: 75 29 jne 0x51 28: 9c pushfq 29: 58 pop %rax * 2a: f6 c4 02 test $0x2,%ah <-- trapping instruction 2d: 75 3d jne 0x6c 2f: 48 f7 04 24 00 02 00 testq $0x200,(%rsp) 36: 00 37: 74 01 je 0x3a 39: fb sti 3a: 48 83 c4 08 add $0x8,%rsp 3e: 44 rex.R 3f: 89 .byte 0x89