INFO: task kworker/0:3:438 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:0     pid:438   tgid:438   ppid:2      flags:0x00004000
Workqueue: events p9_write_work
Call Trace:
 <TASK>
 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
 pipe_write+0x134/0x18a0 fs/pipe.c:455
 __kernel_write_iter+0x395/0x830 fs/read_write.c:617
 __kernel_write fs/read_write.c:637 [inline]
 kernel_write+0x2e6/0x6b0 fs/read_write.c:658
 p9_fd_write net/9p/trans_fd.c:433 [inline]
 p9_write_work+0x551/0xd30 net/9p/trans_fd.c:484
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2c7/0x370 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
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 26040f0ed9382bf65720d717d6d6db2d10869199
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __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+0x2c7/0x370 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: kauditd Not tainted syzkaller #0 26040f0ed9382bf65720d717d6d6db2d10869199
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 70 05 48 89 de e8 50 3a 52 00 5b 5d e9 c9 11 09 04 cc cc cc cc cc cc cc cc cc b8 fd e2 93 f6 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 48 8b 45 08 65 48 8b 0c 25 80 eb 04 00 65
RSP: 0018:ffffc9000025f200 EFLAGS: 00000217
RAX: 0000000000000032 RBX: ffffc9000025f280 RCX: ffff888103678000
RDX: dffffc0000000000 RSI: 00000000000000fb RDI: ffffc9000025f280
RBP: ffffc9000025f238 R08: ffff888103678000 R09: 0000000000000005
R10: 0000000000000030 R11: 0000000000000000 R12: 0000000000000035
R13: ffffffff85c91f63 R14: ffffffff85c91f63 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005628be145b98 CR3: 000000010b3a0000 CR4: 00000000003526b0
DR0: 0000000000000065 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 format_decode+0x93c/0x1600 lib/vsprintf.c:2571
 vsnprintf+0xe6/0x1aa0 lib/vsprintf.c:2755
 sprintf+0xda/0x120 lib/vsprintf.c:3007
 print_time kernel/printk/printk.c:1387 [inline]
 info_print_prefix+0x183/0x480 kernel/printk/printk.c:1416
 record_print_text+0x155/0x430 kernel/printk/printk.c:1465
 printk_get_next_message+0x273/0x930 kernel/printk/printk.c:3038
 console_emit_next_record kernel/printk/printk.c:3106 [inline]
 console_flush_all+0x3a4/0xaa0 kernel/printk/printk.c:3240
 __console_flush_and_unlock kernel/printk/printk.c:3299 [inline]
 console_unlock+0xe9/0x270 kernel/printk/printk.c:3339
 vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2463
 vprintk_default+0x2a/0x40 kernel/printk/printk.c:2478
 vprintk+0x93/0xa0 kernel/printk/printk_safe.c:73
 _printk+0xd0/0x120 kernel/printk/printk.c:2488
 kauditd_printk_skb kernel/audit.c:546 [inline]
 kauditd_hold_skb+0x1cc/0x230 kernel/audit.c:581
 kauditd_send_queue+0x2c5/0x310 kernel/audit.c:766
 kauditd_thread+0x4f0/0x740 kernel/audit.c:890
 kthread+0x2c7/0x370 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
 </TASK>