INFO: task syz.2.2528:7956 blocked for more than 122 seconds.
      Not tainted 6.12.30-syzkaller-g21ed84930c16 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2528      state:D stack:0     pid:7956  tgid:7955  ppid:7281   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5947 [inline]
 __schedule+0x132b/0x1e00 kernel/sched/core.c:7775
 __schedule_loop kernel/sched/core.c:7856 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7871
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 quota_sync_all fs/quota/quota.c:69 [inline]
 __do_sys_quotactl fs/quota/quota.c:938 [inline]
 __se_sys_quotactl+0x308/0x7d0 fs/quota/quota.c:917
 __x64_sys_quotactl+0x9f/0xc0 fs/quota/quota.c:917
 x64_sys_call+0x2818/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:180
 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: 0033:0x7f1b7478e929
RSP: 002b:00007f1b75646038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f1b749b5fa0 RCX: 00007f1b7478e929
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f1b74810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1b749b5fa0 R15: 00007ffc2ddbbfd8
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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:229 [inline]
 watchdog+0xd8f/0xed0 kernel/hung_task.c:385
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 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: 0 Comm: swapper/1 Not tainted 6.12.30-syzkaller-g21ed84930c16 #0 fa4558fba7fa11aa57b2c84caea5bf67b39b1b5f
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__update_blocked_fair kernel/sched/fair.c:10040 [inline]
RIP: 0010:sched_balance_update_blocked_averages+0x262/0x1320 kernel/sched/fair.c:10149
Code: 00 00 48 8b 84 24 b8 00 00 00 49 89 c5 48 39 d8 0f 84 5f 0e 00 00 4c 89 e8 48 c1 e8 03 48 89 84 24 a0 00 00 00 42 80 3c 20 00 <74> 08 4c 89 ef e8 04 e8 7c 00 49 8b 45 00 48 89 84 24 b8 00 00 00
RSP: 0018:ffffc90000230ca0 EFLAGS: 00000046
RAX: 1ffff1102b6409a9 RBX: ffff8881f6f503a0 RCX: dffffc0000000000
RDX: 000000000000aed2 RSI: dffffc0000000000 RDI: ffff8881f6f4fa58
RBP: ffffc90000230df0 R08: 0000000000000007 R09: 0000000000000007
R10: 0000000000000396 R11: ffff8881f6f4fa58 R12: dffffc0000000000
R13: ffff88815b204d48 R14: 1ffff1102281bbab R15: ffff88811712e800
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bf50d7c620 CR3: 00000000072a8000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 update_nohz_stats kernel/sched/fair.c:12840 [inline]
 _nohz_idle_balance+0x31e/0x5a0 kernel/sched/fair.c:12908
 nohz_idle_balance kernel/sched/fair.c:12965 [inline]
 sched_balance_softirq+0x8a/0x170 kernel/sched/fair.c:13193
 handle_softirqs+0x1ae/0x630 kernel/softirq.c:603
 __do_softirq kernel/softirq.c:641 [inline]
 invoke_softirq kernel/softirq.c:458 [inline]
 __irq_exit_rcu+0x48/0xc0 kernel/softirq.c:690
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:702
 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 fe 08 61 95 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 73 8c 41 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 83 57 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c6
RAX: ffff8881f6f00000 RBX: ffff88810366b900 RCX: ffffffff8585c00e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000034a324
RBP: ffffc900001a7e00 R08: ffff8881f6f39733 R09: 1ffff1103ede72e6
R10: dffffc0000000000 R11: ffffed103ede72e7 R12: 1ffff110206cd720
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87ca7b28
 arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:748
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:785
 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
 start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
 common_startup_64+0x13b/0x157
 </TASK>