INFO: task syz.0.1410:4673 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1410      state:D stack:0     pid:4673  tgid:4671  ppid:290    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6016 [inline]
 __schedule+0x1399/0x1fa0 kernel/sched/core.c:7870
 __schedule_loop kernel/sched/core.c:7951 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7966
 request_wait_answer fs/fuse/dev.c:477 [inline]
 __fuse_request_send fs/fuse/dev.c:493 [inline]
 __fuse_simple_request+0xdee/0x1b10 fs/fuse/dev.c:588
 fuse_simple_request fs/fuse/fuse_i.h:1248 [inline]
 fuse_send_open fs/fuse/file.c:53 [inline]
 fuse_file_open+0x574/0x940 fs/fuse/file.c:174
 fuse_do_open+0x56/0xe0 fs/fuse/file.c:204
 fuse_dir_open+0x3ae/0x19d0 fs/fuse/dir.c:2028
 do_dentry_open+0x978/0x1510 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: 0033:0x7fca6159c819
RSP: 002b:00007fca62504028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fca61816090 RCX: 00007fca6159c819
RDX: 0000000000000080 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007fca61632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca61816128 R14: 00007fca61816090 R15: 00007ffc4f8044d8
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 90b12aa1a603b2eff3e7fbc29ad65555fd578c6a
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __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+0x2c6/0x370 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 90b12aa1a603b2eff3e7fbc29ad65555fd578c6a
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:sched_balance_domains+0x477/0x9c0 kernel/sched/fair.c:12442
Code: 39 c4 0f 88 a5 00 00 00 48 8b 7c 24 20 48 8b 74 24 28 48 8b 54 24 08 8b 5c 24 14 89 d9 4c 8d 84 24 a0 00 00 00 e8 a9 18 00 00 <85> c0 49 bc 00 00 00 00 00 fc ff df 0f 84 17 01 00 00 48 8b 7c 24
RSP: 0018:ffffc90000007d00 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: fffff52000000f94
RBP: ffffc90000007e10 R08: 0000000000000004 R09: 0000000000000004
R10: fffff52000000f34 R11: fffffbfff0e82ad9 R12: 0000000100000c3e
R13: ffff888101a70848 R14: 1ffff1102034e109 R15: 1ffff1102034e10a
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54b2741000 CR3: 0000000102b52000 CR4: 00000000003526b0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000080083
DR3: ffffffffefffff16 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 _nohz_idle_balance+0x3fb/0x5c0 kernel/sched/fair.c:12893
 nohz_idle_balance kernel/sched/fair.c:12936 [inline]
 sched_balance_softirq+0x8a/0x170 kernel/sched/fair.c:13166
 handle_softirqs+0x1ad/0x630 kernel/softirq.c:621
 __do_softirq+0xf/0x16 kernel/softirq.c:659
 do_softirq+0xb8/0x110 kernel/softirq.c:503
 </IRQ>
 <TASK>
 do_softirq_post_smp_call_flush include/linux/interrupt.h:625 [inline]
 flush_smp_call_function_queue+0xe3/0x150 kernel/smp.c:617
 do_idle+0x447/0x4b0 kernel/sched/idle.c:353
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:424
 rest_init+0x10b/0x130 init/main.c:760
 start_kernel+0x462/0x4bb init/main.c:1242
 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>