INFO: task syz.2.42:569 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.42        state:D stack:0     pid:569   tgid:568   ppid:481    flags:0x00004004
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_timeout+0xb2/0x3a0 kernel/time/timer.c:2595
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x359/0x630 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6d2/0xac0 kernel/workqueue.c:4233
 __cancel_work_sync kernel/workqueue.c:4354 [inline]
 cancel_work_sync+0xac/0xe0 kernel/workqueue.c:4391
 p9_conn_destroy net/9p/trans_fd.c:915 [inline]
 p9_fd_close+0x252/0x450 net/9p/trans_fd.c:950
 p9_client_create+0xc69/0x1190 net/9p/client.c:1060
 v9fs_session_init+0x1e1/0x1820 fs/9p/v9fs.c:410
 v9fs_mount+0xd7/0xa00 fs/9p/vfs_super.c:122
 legacy_get_tree+0x103/0x1b0 fs/fs_context.c:662
 vfs_get_tree+0xa1/0x290 fs/super.c:1817
 do_new_mount+0x251/0xb40 fs/namespace.c:3537
 path_mount+0x688/0x1050 fs/namespace.c:3864
 do_mount fs/namespace.c:3877 [inline]
 __do_sys_mount fs/namespace.c:4087 [inline]
 __se_sys_mount+0x2bd/0x480 fs/namespace.c:4064
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4064
 x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0033:0x7fb57ff8ec29
RSP: 002b:00007fb580dcf038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb5801d5fa0 RCX: 00007fb57ff8ec29
RDX: 0000200000000400 RSI: 00002000000003c0 RDI: 0000000000000000
RBP: 00007fb580011e41 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb5801d6038 R14: 00007fb5801d5fa0 R15: 00007ffc59f72ae8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 9d83a778554cf65cd8f1be1c858e89e6dd8ff271
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+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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 9d83a778554cf65cd8f1be1c858e89e6dd8ff271
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:sched_balance_domains+0x1fd/0xa10 kernel/sched/fair.c:-1
Code: 48 89 44 24 70 48 03 18 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 0f 60 7d 00 4c 8b 23 4d 85 e4 0f 84 30 06 00 00 <48> c7 44 24 50 00 00 00 00 48 c7 c0 c0 b9 20 87 48 c1 e8 03 48 89
RSP: 0018:ffffc90000007ce0 EFLAGS: 00000286
RAX: 1ffff1103edca0c8 RBX: ffff8881f6e50640 RCX: dffffc0000000000
RDX: 0000000000009aab RSI: 0000000000000001 RDI: ffff8881f6e4f980
RBP: ffffc90000007df0 R08: ffff8881f6e50750 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000fb0 R12: ffff888101a6c400
R13: dffffc0000000000 R14: 1ffff1103edca0b5 R15: 1ffff92000000fac
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e60cd0f98 CR3: 0000000118ee2000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 _nohz_idle_balance+0x3e3/0x5a0 kernel/sched/fair.c:12951
 nohz_idle_balance kernel/sched/fair.c:12994 [inline]
 sched_balance_softirq+0x8a/0x170 kernel/sched/fair.c:13229
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 __do_softirq kernel/softirq.c:659 [inline]
 invoke_softirq kernel/softirq.c:476 [inline]
 __irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x7f/0x90 arch/x86/kernel/smp.c:266
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 ad d3 88 80 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 32 3a 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 d3 54 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff87207da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff87215540 RCX: ffffffff858d20be
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000105aa4
RBP: ffffffff87207da0 R08: ffff8881f6e39733 R09: 1ffff1103edc72e6
R10: dffffc0000000000 R11: ffffed103edc72e7 R12: 1ffffffff0e42aa8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87cb1da8
 arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x1a0/0x470 kernel/sched/idle.c:326
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
 rest_init+0x10b/0x130 init/main.c:748
 start_kernel+0x46a/0x4bb init/main.c:1135
 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
 common_startup_64+0x13b/0x157
 </TASK>