INFO: task udevd:22521 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:22521 tgid:22521 ppid:110 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
bdev_open+0xd5/0xd60 block/bdev.c:926
blkdev_open+0x3d1/0x560 block/fops.c:627
do_dentry_open+0x97b/0x1510 fs/open.c:960
vfs_open+0x86/0x230 fs/open.c:1090
do_open fs/namei.c:3774 [inline]
path_openat+0x2b6c/0x34b0 fs/namei.c:3933
do_filp_open+0x30d/0x3e0 fs/namei.c:3962
do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
do_sys_open fs/open.c:1453 [inline]
__do_sys_openat fs/open.c:1469 [inline]
__se_sys_openat fs/open.c:1464 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1464
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f939edd9407
RSP: 002b:00007ffecfd677e0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f939ed4d880 RCX: 00007f939edd9407
RDX: 00000000000a0800 RSI: 0000562f7fc51830 RDI: ffffffffffffff9c
RBP: 0000562f7fa0c2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000562f7fc4d560
R13: 0000562f7fc54280 R14: 0000000000000000 R15: 0000562f7fc4d560
INFO: task syz.5.8112:24470 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.8112 state:D stack:0 pid:24470 tgid:24469 ppid:23687 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
io_schedule+0x89/0xe0 kernel/sched/core.c:8699
folio_wait_bit_common+0x6ae/0x910 mm/filemap.c:1354
folio_put_wait_locked mm/filemap.c:1518 [inline]
do_read_cache_folio+0x14d/0x4d0 mm/filemap.c:3970
read_cache_folio+0x54/0x90 mm/filemap.c:4020
read_mapping_folio include/linux/pagemap.h:1021 [inline]
read_part_sector+0xcc/0x250 block/partitions/core.c:716
msdos_partition+0x118/0x3000 block/partitions/msdos.c:592
check_partition block/partitions/core.c:138 [inline]
blk_add_partitions block/partitions/core.c:583 [inline]
bdev_disk_changed+0x81c/0x1610 block/partitions/core.c:687
loop_reread_partitions+0x64/0x110 drivers/block/loop.c:467
loop_configure+0xfd8/0x1310 drivers/block/loop.c:1074
lo_ioctl+0x802/0x1d50 drivers/block/loop.c:-1
blkdev_ioctl+0x546/0x680 block/ioctl.c:699
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x135/0x1b0 fs/ioctl.c:893
__x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb6aaf8efc9
RSP: 002b:00007fb6a99f7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb6ab1e5fa0 RCX: 00007fb6aaf8efc9
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000003
RBP: 00007fb6ab011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6ab1e6038 R14: 00007fb6ab1e5fa0 R15: 00007ffdec251b48
INFO: task syz.5.8112:24479 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.8112 state:D stack:0 pid:24479 tgid:24469 ppid:23687 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
blk_mq_freeze_queue_wait+0xe6/0x170 block/blk-mq.c:204
blk_freeze_queue+0xc7/0x100 block/blk-mq.c:231
blk_mq_freeze_queue+0x19/0x30 block/blk-mq.c:240
loop_set_status+0x1fe/0x710 drivers/block/loop.c:1228
lo_ioctl+0x9fe/0x1d50 drivers/block/loop.c:-1
blkdev_ioctl+0x546/0x680 block/ioctl.c:699
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x135/0x1b0 fs/ioctl.c:893
__x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb6aaf8efc9
RSP: 002b:00007fb6a99d6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb6ab1e6090 RCX: 00007fb6aaf8efc9
RDX: 0000200000000280 RSI: 0000000000004c02 RDI: 0000000000000003
RBP: 00007fb6ab011f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb6ab1e6128 R14: 00007fb6ab1e6090 R15: 00007ffdec251b48
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 28603 Comm: syz.9.9500 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:230 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:149 [inline]
RIP: 0010:wrmsr arch/x86/include/asm/msr.h:256 [inline]
RIP: 0010:native_apic_msr_write+0x42/0x60 arch/x86/include/asm/apic.h:212
Code: 75 17 5d c3 cc cc cc cc cc 81 ff d0 00 00 00 74 f1 81 ff e0 00 00 00 74 e9 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 eb d4 f3 0f 1e fa 89 f6 31 d2 e8 dd f1 9a 01 5d c3 cc cc cc
RSP: 0018:ffffc90000230df8 EFLAGS: 00000046
RAX: 000000000000decc RBX: ffff8881f6f28380 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000decc RDI: 0000000000000838
RBP: ffffc90000230df8 R08: ffff88811dbe9300 R09: 0000000000000002
R10: 0000000000000000 R11: ffffffff8141fe60 R12: 0000000000000020
R13: dffffc0000000000 R14: 0000000010005c46 R15: 000000000000decc
FS: 00005555804b4500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31223ffc CR3: 0000000144de0000 CR4: 00000000003526b0
Call Trace:
apic_write arch/x86/include/asm/apic.h:405 [inline]
lapic_next_event+0x15/0x20 arch/x86/kernel/apic/apic.c:415
clockevents_program_event+0x1e0/0x350 kernel/time/clockevents.c:334
tick_program_event+0x9b/0x120 kernel/time/tick-oneshot.c:44
hrtimer_interrupt+0xa66/0xf00 kernel/time/hrtimer.c:1892
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x8e/0x2b0 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x7d/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4e/0x70 kernel/locking/spinlock.c:202
Code: 48 89 fb 48 c7 c7 e0 6c 2e 87 e8 ed eb 4c fc 48 89 df 48 83 3d 92 ec 9e 01 00 74 1f e8 fb 0c 00 00 90 fb 65 ff 0d aa 6a 75 7a <74> 08 5b 5d c3 cc cc cc cc cc e8 43 7a 7a fb eb f1 0f 0b 66 2e 0f
RSP: 0018:ffffc90001857cd0 EFLAGS: 00000286
RAX: 0000000000000001 RBX: 000000001c000004 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88810f38abc0
RBP: ffffc90001857cd8 R08: 0000000000000000 R09: 00007f702752b090
R10: 000000001c000004 R11: 00007f70275b7700 R12: dffffc0000000000
R13: 1ffff11021e715fc R14: 0000000000000000 R15: 0000000000000021
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x12ba/0x14f0 kernel/signal.c:2936
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f702744da20
Code: 74 28 48 85 c9 74 29 45 38 1c 10 75 23 83 c0 01 44 39 d0 75 dc 48 89 f0 25 ff 1f 00 00 49 89 34 c1 41 88 3c 00 31 c0 c3 66 90 <41> 38 3c 10 74 0b 41 88 3c 10 31 c0 49 89 34 d1 c3 b8 01 00 00 00
RSP: 002b:00007fffca410f88 EFLAGS: 00000246
RAX: 000000008589a2bd RBX: 00007f7028315720 RCX: ffffffff8589a2bd
RDX: 00000000000002bd RSI: ffffffff8589a2bd RDI: 0000000000000002
RBP: ffffffff8589a2bd R08: 00007f70277d0000 R09: 00007f70277d2000
R10: 000000008589a2c1 R11: 0000000000000002 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8589a2bd R15: 000000000000ee13