INFO: task syz.0.3721:1372 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3721 state:D stack:24160 pid:1372 tgid:1370 ppid:20863 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5310 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
bdev_open+0xe0/0xd30 block/bdev.c:961
blkdev_open+0x470/0x610 block/fops.c:698
do_dentry_open+0x785/0x14e0 fs/open.c:949
vfs_open+0x3b/0x340 fs/open.c:1081
do_open fs/namei.c:4671 [inline]
path_openat+0x2e08/0x3860 fs/namei.c:4830
do_file_open+0x23e/0x4a0 fs/namei.c:4859
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd96935b78e
RSP: 002b:00007fd96a2c0b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd96a2c16c0 RCX: 00007fd96935b78e
RDX: 0000000000000000 RSI: 00007fd96a2c0c00 RDI: ffffffffffffff9c
RBP: 00007fd96a2c0c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007fd969616038 R14: 00007fd969615fa0 R15: 00007ffd943c85e8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e960320 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5581:
#0: ffff8880371630a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5802:
#0: ffff8880b843ade0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:647
1 lock held by udevd/5817:
#0: ffff888026f42358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:961
1 lock held by syz.0.3721/1372:
#0: ffff888026f42358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30 block/bdev.c:961
3 locks held by syz.4.4425/9325:
#0: ffff888067743b88 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#0: ffff888067743b88 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: __sock_release+0x89/0x250 net/socket.c:665
#1: ffffffff8fe549b0 ((netlink_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x54/0x90 kernel/notifier.c:379
#2: ffff88807c1870d8 (&nft_net->commit_mutex){+.+.}-{4:4}, at: nft_rcv_nl_event+0x13d/0xdb0 net/netfilter/nf_tables_api.c:12145
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:347 [inline]
watchdog+0x103d/0x1090 kernel/hung_task.c:516
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10160 Comm: udevd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:-1 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0x23b/0x2c0 mm/kasan/generic.c:200
Code: db 0f 85 88 00 00 00 4c 89 fb 48 c1 eb 28 84 db 0f 85 82 00 00 00 49 c1 ef 30 bb 07 00 00 00 45 84 ff 75 7d 4d 01 f3 49 01 db <4d> 89 dc 4d 85 db 74 84 4d 01 d1 4d 39 cc 75 11 41 83 e0 07 45 0f
RSP: 0018:ffffc9000e27f0f0 EFLAGS: 00000206
RAX: ffffffff8bb49601 RBX: ffffffffffffffff RCX: ffffffff8bb496cb
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8bcd88cb
RBP: ffffffff8bcd88cc R08: ffffffff8bcd88cb R09: 1ffffffff179b119
R10: dffffc0000000000 R11: fffffbfff179b119 R12: 0000000000000001
R13: ffffc9000e27f42d R14: fffffbfff179b11a R15: 1ffffffff179b119
FS: 00007f990df48880(0000) GS:ffff888125015000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd00de7f52 CR3: 0000000037cc0000 CR4: 00000000003526f0
Call Trace:
__asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
vsnprintf+0x38b/0xee0 lib/vsprintf.c:2899
sprintf+0xe7/0x140 lib/vsprintf.c:3111
print_time kernel/printk/printk.c:1359 [inline]
info_print_prefix+0x16b/0x360 kernel/printk/printk.c:1385
record_print_text+0x176/0x450 kernel/printk/printk.c:1434
printk_get_next_message+0x29c/0x880 kernel/printk/printk.c:3020
console_emit_next_record kernel/printk/printk.c:3085 [inline]
console_flush_one_record kernel/printk/printk.c:3217 [inline]
console_flush_all+0x501/0xb20 kernel/printk/printk.c:3291
__console_flush_and_unlock kernel/printk/printk.c:3321 [inline]
console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3361
vprintk_emit+0x485/0x560 kernel/printk/printk.c:2428
devkmsg_emit+0xe4/0x140 kernel/printk/printk.c:733
devkmsg_write+0x31c/0x400 kernel/printk/printk.c:796
do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
vfs_writev+0x33c/0x990 fs/read_write.c:1059
do_writev+0x154/0x2e0 fs/read_write.c:1105
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f990d8a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdbebd8ef0 EFLAGS: 00000202 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f990df48880 RCX: 00007f990d8a7407
RDX: 0000000000000005 RSI: 00007ffdbebd8fb0 RDI: 0000000000000005
RBP: 00007ffdbebd90e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffdbebd8fb0
R13: 00007ffdbebd9040 R14: 0000000000000000 R15: 00007ffdbebd9020
----------------
Code disassembly (best guess):
0: db 0f fisttpl (%rdi)
2: 85 88 00 00 00 4c test %ecx,0x4c000000(%rax)
8: 89 fb mov %edi,%ebx
a: 48 c1 eb 28 shr $0x28,%rbx
e: 84 db test %bl,%bl
10: 0f 85 82 00 00 00 jne 0x98
16: 49 c1 ef 30 shr $0x30,%r15
1a: bb 07 00 00 00 mov $0x7,%ebx
1f: 45 84 ff test %r15b,%r15b
22: 75 7d jne 0xa1
24: 4d 01 f3 add %r14,%r11
27: 49 01 db add %rbx,%r11
* 2a: 4d 89 dc mov %r11,%r12 <-- trapping instruction
2d: 4d 85 db test %r11,%r11
30: 74 84 je 0xffffffb6
32: 4d 01 d1 add %r10,%r9
35: 4d 39 cc cmp %r9,%r12
38: 75 11 jne 0x4b
3a: 41 83 e0 07 and $0x7,%r8d
3e: 45 rex.RB
3f: 0f .byte 0xf