INFO: task udevd:5846 blocked 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:23144 pid:5846 ppid:5158 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
io_schedule+0x80/0xd0 kernel/sched/core.c:9022
folio_wait_bit_common+0x6eb/0xf70 mm/filemap.c:1329
folio_put_wait_locked mm/filemap.c:1493 [inline]
do_read_cache_folio+0x1c0/0x7e0 mm/filemap.c:3771
read_mapping_folio include/linux/pagemap.h:898 [inline]
read_part_sector+0xd2/0x350 block/partitions/core.c:718
adfspart_check_POWERTEC+0x8d/0xf00 block/partitions/acorn.c:454
check_partition block/partitions/core.c:138 [inline]
blk_add_partitions block/partitions/core.c:600 [inline]
bdev_disk_changed+0x73a/0x1410 block/partitions/core.c:689
blkdev_get_whole+0x30d/0x390 block/bdev.c:655
blkdev_get_by_dev+0x279/0x600 block/bdev.c:797
blkdev_open+0x152/0x360 block/fops.c:589
do_dentry_open+0x8c6/0x1500 fs/open.c:929
do_open fs/namei.c:3632 [inline]
path_openat+0x274b/0x3190 fs/namei.c:3789
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_openat fs/open.c:1450 [inline]
__se_sys_openat fs/open.c:1445 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1445
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f03098a7407
RSP: 002b:00007ffd5bee35e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0309f6b880 RCX: 00007f03098a7407
RDX: 00000000000a0800 RSI: 000055bae0265840 RDI: ffffffffffffff9c
RBP: 000055bae0259910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055bae02eaf10
R13: 000055bae0271410 R14: 0000000000000000 R15: 000055bae02eaf10
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2fc20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2fc20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2fc20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:3/48:
#0: ffff888017871538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017871538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc90000b8fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90000b8fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
3 locks held by kworker/u4:6/1079:
2 locks held by getty/5548:
#0: ffff88802cc7b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by udevd/5846:
#0: ffff88802198b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x121/0x600 block/bdev.c:788
1 lock held by syz.1.2162/12748:
#0: ffff88802198b4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x121/0x600 block/bdev.c:788
8 locks held by syz-executor/13380:
4 locks held by sed/13483:
1 lock held by syz.8.2309/13484:
1 lock held by syz.8.2309/13485:
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1731 [inline]
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tls_setsockopt net/tls/tls_main.c:775 [inline]
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tls_setsockopt+0x20f/0xf60 net/tls/tls_main.c:804
1 lock held by syz.8.2309/13489:
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1731 [inline]
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: do_tls_setsockopt net/tls/tls_main.c:775 [inline]
#0: ffff888060829b30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tls_setsockopt+0x20f/0xf60 net/tls/tls_main.c:804
3 locks held by syz.8.2309/13491:
#0: ffffffff8d49f0c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2044 [inline]
#0: ffffffff8d49f0c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x20d/0xd10 drivers/tty/tty_io.c:2127
#1: ffff88802ed461c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_init_dev+0x74/0x4c0 drivers/tty/tty_io.c:1413
#2: ffffffff8cd23f60 (console_lock){+.+.}-{0:0}, at: con_install+0x9c/0x700 drivers/tty/vt/vt.c:3331
2 locks held by modprobe/13490:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13484 Comm: syz.8.2309 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:posix_timer_fn+0x0/0x3d0 kernel/time/posix-timers.c:312
Code: ff ff 48 89 ef e8 a0 ff 64 00 e9 58 fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa e8 57 b9 0d 00 f3 90 c3 0f 1f 40 00 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 49 89 fc 48
RSP: 0018:ffffc900001f0d38 EFLAGS: 00000046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88801b313c00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff8880771f4de8
RBP: ffffc900001f0e90 R08: ffffffff8e4a912f R09: 1ffffffff1c95225
R10: dffffc0000000000 R11: fffffbfff1c95226 R12: ffff8880771f4de8
R13: ffff88801b3146c8 R14: 0000000000000000 R15: 1ffff110036628d9
FS: 000055555f18d500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f75fb3b1f98 CR3: 000000006bc6b000 CR4: 00000000003506e0
DR0: 0000040000000000 DR1: 0000000000000001 DR2: 0000000000000008
DR3: 0000000000000006 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1755 [inline]
__hrtimer_run_queues+0x51e/0xc40 kernel/time/hrtimer.c:1819
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1881
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4a d0 ef f6 48 89 df e8 62 a2 f0 f6 e8 2d 41 14 f7 fb bf 01 00 00 00 b2 b9 e3 f6 65 8b 05 23 08 8c 75 85 c0 74 02 5b c3 e8 00 ea 88
RSP: 0018:ffffc900040c7c98 EFLAGS: 00000282
RAX: 1335d41628a27f00 RBX: ffff888077b8e5c0 RCX: 1335d41628a27f00
RDX: dffffc0000000000 RSI: ffffffff8aaabaa0 RDI: 0000000000000001
RBP: ffff888077b8e858 R08: ffffffff8e4a912f R09: 1ffffffff1c95225
R10: dffffc0000000000 R11: fffffbfff1c95226 R12: 1ffff1100ef71d0b
R13: 0000000000000011 R14: dffffc0000000000 R15: 0000000000000000
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x11f5/0x1400 kernel/signal.c:2905
arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f75fd58ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd1ab24568 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007f75fd7c6188 RCX: 00007f75fd58ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f75fd7c6188
RBP: 0000000000000002 R08: 0000000000000028 R09: 000000191ab2485f
R10: 00007f75fd7c5fa0 R11: 0000000000000246 R12: 00007f75fd7c618c
R13: 00007f75fd7c6180 R14: 0000000000001d62 R15: 0000000000000003