INFO: task syz.0.389:9029 blocked for more than 163 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.389 state:D stack:29304 pid:9029 tgid:9027 ppid:8226 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5504 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7228
__schedule_loop kernel/sched/core.c:7307 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7603
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1670 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked+0x1f84/0x25b0 kernel/locking/rtmutex.c:1787
__rwbase_read_lock+0xc3/0x180 kernel/locking/rwbase_rt.c:114
rwbase_read_lock kernel/locking/rwbase_rt.c:147 [inline]
__down_read kernel/locking/rwsem.c:1502 [inline]
down_read+0x132/0x200 kernel/locking/rwsem.c:1576
__super_lock fs/super.c:60 [inline]
super_lock+0x2d6/0x3d0 fs/super.c:122
user_get_super+0xc8/0x120 fs/super.c:941
quotactl_block fs/quota/quota.c:889 [inline]
__do_sys_quotactl fs/quota/quota.c:955 [inline]
__se_sys_quotactl+0x538/0x9a0 fs/quota/quota.c:917
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a5c6ece59
RSP: 002b:00007f5a5a925028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f5a5c966090 RCX: 00007f5a5c6ece59
RDX: ffffffffffffffff RSI: 00002000000000c0 RDI: ffffffff80000900
RBP: 00007f5a5c782e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a5c966128 R14: 00007f5a5c966090 R15: 00007ffe96535978
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13241 Comm: syz.6.773 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:___update_load_sum kernel/sched/pelt.c:227 [inline]
RIP: 0010:__update_load_avg_se+0x557/0xbd0 kernel/sched/pelt.c:309
Code: b6 6c 24 07 40 84 ed 74 21 c1 e3 0a 4d 8d bc 24 18 01 00 00 4c 89 f8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85 d4 04 00 00 41 01 1f <49> c1 ed 0a 45 85 ed 0f 84 9b 00 00 00 4c 89 e3 4c 89 e0 48 c1 e8
RSP: 0000:ffffc900103d7138 EFLAGS: 00000046
RAX: 1ffff11007ed2412 RBX: 0000000000001595 RCX: 7ffffffffffffc00
RDX: 0000000000565400 RSI: dffffc0000000000 RDI: ffff88803f692098
RBP: 0000000000000000 R08: 000000000000024d R09: 0000000000000000
R10: ffffe8ffffd95798 R11: ffffffff81971450 R12: ffff88803f691f80
R13: 0000000000001a4d R14: 1ffff11007ed2413 R15: ffff88803f692090
FS: 00007ff36c0366c0(0000) GS:ffff88812621d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d946cefeb CR3: 00000000351e0000 CR4: 00000000003526f0
Call Trace:
update_load_avg+0x1ae/0x1950 kernel/sched/fair.c:5652
set_next_entity kernel/sched/fair.c:6338 [inline]
set_next_task_fair+0x116/0xce0 kernel/sched/fair.c:15045
put_prev_set_next_task kernel/sched/sched.h:2770 [inline]
__pick_next_task+0x215/0x3c0 kernel/sched/core.c:6146
pick_next_task kernel/sched/core.c:-1 [inline]
__schedule+0x864/0x5500 kernel/sched/core.c:7143
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7409
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
raw_spin_unlock_irqrestore_wake include/linux/sched/wake_q.h:102 [inline]
rtlock_slowlock kernel/locking/rtmutex.c:1923 [inline]
rtlock_lock kernel/locking/spinlock_rt.c:43 [inline]
__rt_spin_lock kernel/locking/spinlock_rt.c:49 [inline]
rt_spin_lock+0x316/0x400 kernel/locking/spinlock_rt.c:57
spin_lock include/linux/spinlock_rt.h:45 [inline]
folio_lruvec_lock_irqsave+0x293/0x540 mm/memcontrol.c:1464
folio_lruvec_relock_irqsave include/linux/memcontrol.h:1526 [inline]
folio_batch_move_lru+0x4ae/0x820 mm/swap.c:199
__folio_batch_add_and_move+0x446/0xa90 mm/swap.c:231
shmem_alloc_and_add_folio mm/shmem.c:2008 [inline]
shmem_get_folio_gfp+0xc8a/0x1c40 mm/shmem.c:2502
shmem_get_folio mm/shmem.c:2608 [inline]
shmem_write_begin+0x166/0x320 mm/shmem.c:3239
generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4358
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3414
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61e/0xbb0 fs/read_write.c:687
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff36dd9d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ff36c035da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff36c0366c0 RCX: 00007ff36dd9d68e
RDX: 00000000013bd7ef RSI: 00007ff363c16000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ff36c035ee0 R14: 00007ff36c035ea0 R15: 00007ff363c16000