INFO: task udevd:26400 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:26400 tgid:26400 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: 0033:0x7fc49d8a7407
RSP: 002b:00007ffca9832620 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc49e032880 RCX: 00007fc49d8a7407
RDX: 00000000000a0800 RSI: 00005578c1202620 RDI: ffffffffffffff9c
RBP: 00005578c10272c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005578c125c720
R13: 00005578c12680f0 R14: 0000000000000000 R15: 00005578c125c720
INFO: task syz.0.8819:27006 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.8819 state:D stack:0 pid:27006 tgid:27005 ppid:19960 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: 0033:0x7fd70b18f6c9
RSP: 002b:00007fd70bfb8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd70b3e5fa0 RCX: 00007fd70b18f6c9
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000003
RBP: 00007fd70b211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd70b3e6038 R14: 00007fd70b3e5fa0 R15: 00007ffd4014c828
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: 31465 Comm: syz.3.10297 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:kasan_check_range+0x0/0x2a0 mm/kasan/generic.c:188
Code: ff ff ff e9 c2 67 b3 03 cc 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 b0 01 48 85 f6 0f 84 c4 01 00 00 55 48 89 e5 41 57 41
RSP: 0018:ffffc90002ce7528 EFLAGS: 00000246
RAX: ffffffff81cc7fe6 RBX: ffffea0005947600 RCX: ffffffff81cc8337
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0005947600
RBP: ffffc90002ce7530 R08: ffffea0005943673 R09: 1ffffd4000b286ce
R10: dffffc0000000000 R11: fffff94000b286cf R12: 1ffff1102923de7f
R13: ffff8881491ef3f8 R14: dffffc0000000000 R15: 00007f5daec7f000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056212c6d6b98 CR3: 000000010f344000 CR4: 00000000003526b0
DR0: 0000000000000002 DR1: 0000000000000006 DR2: 0000000000000003
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
folio_test_head include/linux/page-flags.h:844 [inline]
folio_test_large include/linux/page-flags.h:865 [inline]
zap_present_ptes mm/memory.c:1581 [inline]
zap_pte_range mm/memory.c:1633 [inline]
zap_pmd_range mm/memory.c:1763 [inline]
zap_pud_range mm/memory.c:1792 [inline]
zap_p4d_range mm/memory.c:1813 [inline]
unmap_page_range+0xe97/0x3f80 mm/memory.c:1834
unmap_single_vma mm/memory.c:1880 [inline]
unmap_vmas+0x2c5/0x3e0 mm/memory.c:1924
exit_mmap+0x25b/0xb60 mm/mmap.c:1962
__mmput+0x93/0x320 kernel/fork.c:1349
mmput+0x55/0x170 kernel/fork.c:1372
exit_mm kernel/exit.c:574 [inline]
do_exit+0x918/0x2630 kernel/exit.c:940
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
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: 0033:0x7f5daf9c1f85
Code: Unable to access opcode bytes at 0x7f5daf9c1f5b.
RSP: 002b:00007f5db08bff80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007f5dafbe5fa0 RCX: 00007f5daf9c1f85
RDX: 00007f5db08bffc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f5dafa11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f5dafbe6038 R14: 00007f5dafbe5fa0 R15: 00007ffeee8e2e88