INFO: task udevd:13793 blocked for more than 125 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:udevd state:D stack:0 pid:13793 tgid:13793 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+0x1c6/0x3e0 fs/namei.c:3960
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: 0033:0x7fb911ea7407
RSP: 002b:00007ffd296c1770 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb9125f6880 RCX: 00007fb911ea7407
RDX: 00000000000a0800 RSI: 0000559e73305c80 RDI: ffffffffffffff9c
RBP: 0000559e730c32c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000559e73311610
R13: 0000559e733040f0 R14: 0000000000000000 R15: 0000559e73311610
INFO: task syz.1.4600:13806 blocked for more than 129 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.4600 state:D stack:0 pid:13806 tgid:13805 ppid:11154 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: 0033:0x7f96ac98efc9
RSP: 002b:00007f96ad7b1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f96acbe5fa0 RCX: 00007f96ac98efc9
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000086
RBP: 00007f96aca11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f96acbe6038 R14: 00007f96acbe5fa0 R15: 00007ffe16a56df8
NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 281 Comm: sshd-session Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:arch_try_cmpxchg128 arch/x86/include/asm/cmpxchg_64.h:-1 [inline]
RIP: 0010:__update_freelist_fast mm/slub.c:647 [inline]
RIP: 0010:slab_update_freelist+0x70/0x110 mm/slub.c:717
Code: 4c 39 56 20 75 43 48 39 46 28 75 3d 4c 89 46 20 4c 89 4e 28 b2 01 eb 33 4c 89 c3 4c 89 c9 48 89 c2 4c 89 d0 f0 48 0f c7 4e 20 01 75 39 65 48 8b 0c 25 28 00 00 00 48 3b 4d f0 75 3f 48 83 c4
RSP: 0018:ffffc9000113fb60 EFLAGS: 00000242
RAX: ffff88816b24a500 RBX: ffff88816b24a280 RCX: 00000000000c0003
RDX: 00000000000c0004 RSI: ffffea0005ac9280 RDI: ffff888106648140
RBP: ffffc9000113fb78 R08: ffff88816b24a280 R09: 00000000000c0003
R10: ffff88816b24a500 R11: fffff52000227f5c R12: ffff88816b24a500
R13: 0000000000000003 R14: 00000000000c0004 R15: ffffea0005ac9280
FS: 00007f698419d300(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b9b7332b90 CR3: 000000012b284000 CR4: 00000000003526b0
Call Trace:
__slab_free+0x6f/0x2b0 mm/slub.c:4542
do_slab_free mm/slub.c:4642 [inline]
___cache_free+0xc9/0xe0 mm/slub.c:4753
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:330
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4178 [inline]
slab_alloc_node mm/slub.c:4227 [inline]
kmem_cache_alloc_noprof+0x1cb/0x430 mm/slub.c:4236
alloc_empty_file+0xbf/0x280 fs/file_table.c:209
alloc_file fs/file_table.c:326 [inline]
alloc_file_pseudo+0x12a/0x1c0 fs/file_table.c:355
sock_alloc_file+0xbe/0x2b0 net/socket.c:469
sock_map_fd net/socket.c:494 [inline]
__sys_socket+0x14a/0x1c0 net/socket.c:1728
__do_sys_socket net/socket.c:1733 [inline]
__se_sys_socket net/socket.c:1731 [inline]
__x64_sys_socket+0x7e/0x90 net/socket.c:1731
x64_sys_call+0x2608/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:42
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: 0033:0x7f6983b22707
Code: 54 24 0c e8 6b ac ff ff 83 f8 ff 74 04 8b 44 24 0c 48 83 c4 18 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c1 e6 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd57bfb528 EFLAGS: 00000202 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000026 RCX: 00007f6983b22707
RDX: 0000000000000000 RSI: 0000000000080002 RDI: 0000000000000001
RBP: 00007f6983bae560 R08: 00000000000001f4 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002
R13: 00007ffd57bfb650 R14: 0000000000000033 R15: 00007ffd57bfb650