INFO: task udevd:375 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:375 tgid:375 ppid:111 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7996
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x960/0x1bb0 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x113/0x1d0 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+0x86/0x240 fs/open.c:1092
do_open fs/namei.c:3782 [inline]
path_openat+0x2bb1/0x34f0 fs/namei.c:3941
do_filp_open+0x1f5/0x440 fs/namei.c:3968
do_sys_openat2+0x134/0x1d0 fs/open.c:1440
do_sys_open fs/open.c:1455 [inline]
__do_sys_openat fs/open.c:1471 [inline]
__se_sys_openat fs/open.c:1466 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1466
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
do_syscall_x64 arch/x86/entry/common.c:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9899aa7407
RSP: 002b:00007ffdff881bc0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f989a18e880 RCX: 00007f9899aa7407
RDX: 00000000000a0800 RSI: 000055f054791320 RDI: ffffffffffffff9c
RBP: 000055f05453e2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055f054780f70
R13: 000055f05477f0f0 R14: 0000000000000000 R15: 000055f054780f70
INFO: task syz.0.2135:7233 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.2135 state:D stack:0 pid:7233 tgid:7232 ppid:5008 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5996 [inline]
__schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
__schedule_loop kernel/sched/core.c:7924 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7939
io_schedule+0x88/0xe0 kernel/sched/core.c:8753
folio_wait_bit_common+0x6d8/0x950 mm/filemap.c:1355
folio_put_wait_locked mm/filemap.c:1519 [inline]
do_read_cache_folio+0x14d/0x4c0 mm/filemap.c:4042
read_cache_folio+0x54/0x90 mm/filemap.c:4092
read_mapping_folio include/linux/pagemap.h:1021 [inline]
read_part_sector+0xcc/0x250 block/partitions/core.c:716
msdos_partition+0x116/0x2fd0 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+0x825/0x1610 block/partitions/core.c:687
loop_reread_partitions+0x64/0x110 drivers/block/loop.c:467
loop_configure+0x1068/0x13a0 drivers/block/loop.c:1078
lo_ioctl+0xa8b/0x2070 drivers/block/loop.c:1520
blkdev_ioctl+0x54b/0x690 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:47 [inline]
do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f377359c629
RSP: 002b:00007f3774527028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3773815fa0 RCX: 00007f377359c629
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000003
RBP: 00007f3773632b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3773816038 R14: 00007f3773815fa0 R15: 00007fff01a2a0f8
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 d51130501c30ee86aaec4f48ba6958e62aa015e3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/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+0xdad/0xf00 kernel/hung_task.c:423
kthread+0x2c9/0x370 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: 8950 Comm: syz-executor Not tainted syzkaller #0 d51130501c30ee86aaec4f48ba6958e62aa015e3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:folio_test_anon include/linux/page-flags.h:711 [inline]
RIP: 0010:zap_present_folio_ptes mm/memory.c:1507 [inline]
RIP: 0010:zap_present_ptes mm/memory.c:1591 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1634 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1764 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1793 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1814 [inline]
RIP: 0010:unmap_page_range+0xf39/0x3fa0 mm/memory.c:1835
Code: 00 00 48 8b 44 24 40 4c 8d 70 18 4c 89 f3 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df 80 3c 03 00 74 08 4c 89 f7 e8 e7 11 10 00 <4d> 8b 3e 41 83 e7 01 31 ff 4c 89 fe e8 76 3d b8 ff 48 8b 44 24 68
RSP: 0018:ffffc9000ae9f540 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 1ffffd40008f9dd3 RCX: ffff888114651300
RDX: 0000000000000000 RSI: 0000000000032000 RDI: 0000000000001000
RBP: ffffc9000ae9f770 R08: ffffea00047cee87 R09: 1ffffd40008f9dd0
R10: dffffc0000000000 R11: fffff940008f9dd1 R12: ffffea00047cee80
R13: 1ffff11021cca3c9 R14: ffffea00047cee98 R15: 0000000000032000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556833e948 CR3: 0000000126dc4000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000044 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
unmap_single_vma mm/memory.c:1881 [inline]
unmap_vmas+0x2d2/0x3f0 mm/memory.c:1925
exit_mmap+0x29c/0xbc0 mm/mmap.c:1962
__mmput+0x93/0x320 kernel/fork.c:1353
mmput+0x55/0x170 kernel/fork.c:1376
exit_mm kernel/exit.c:574 [inline]
do_exit+0x93f/0x2650 kernel/exit.c:940
do_group_exit+0x229/0x2f0 kernel/exit.c:1095
get_signal+0x1398/0x14e0 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x760 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+0x57/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f385b157817
Code: Unable to access opcode bytes at 0x7f385b1577ed.
RSP: 002b:00007ffdc86e9250 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000055557dcc8500 RCX: 00007f385b157817
RDX: 0000000040000000 RSI: 00007ffdc86e92ac RDI: ffffffffffffffff
RBP: 00007ffdc86e92ac R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffdc86e9508 R15: 0000000000000000