INFO: task syz.4.2537:8113 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2537 state:D stack:0 pid:8113 tgid:8112 ppid:7444 flags:0x00004004
Call Trace:
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
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: 0033:0x7fd8c878f6c9
RSP: 002b:00007fd8c961d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd8c89e5fa0 RCX: 00007fd8c878f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007fd8c8811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd8c89e6038 R14: 00007fd8c89e5fa0 R15: 00007ffc75863dd8
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
__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
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 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:timer_base_try_to_set_idle+0x30/0x80 kernel/time/timer.c:2358
Code: 89 e5 41 57 41 56 53 48 89 d3 49 89 f6 49 89 ff e8 05 b1 10 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 35 80 3b 01 75 11 e8 e2 b0 10 00 48 b8 ff ff ff ff ff ff
RSP: 0018:ffffffff87207cb8 EFLAGS: 00000806
RAX: 0000000000000001 RBX: ffffffff87207d60 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000004cbb4e8600 RDI: 0000000100000b25
RBP: ffffffff87207cd0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e40f54 R12: ffff8881f6e2d580
R13: 1ffff1103edc5ab0 R14: 0000004cbb4e8600 R15: 0000000100000b25
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc6d9b729e0 CR3: 0000000122942000 CR4: 00000000003526b0
DR0: 0000000000000002 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
tick_nohz_stop_tick kernel/time/tick-sched.c:996 [inline]
tick_nohz_idle_stop_tick+0x21b/0x9f0 kernel/time/tick-sched.c:1237
cpuidle_idle_call kernel/sched/idle.c:183 [inline]
do_idle+0x19b/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