INFO: task syz.2.17:384 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.17 state:D stack:0 pid:384 tgid:381 ppid:371 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: 0033:0x7f56a6b8ebe9
RSP: 002b:00007f56a79be038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f56a6dc6090 RCX: 00007f56a6b8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f56a6c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f56a6dc6128 R14: 00007f56a6dc6090 R15: 00007ffe4e282ae8
INFO: task syz.3.18:400 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.18 state:D stack:0 pid:400 tgid:396 ppid:386 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: 0033:0x7f095158ebe9
RSP: 002b:00007f0952412038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f09517c6090 RCX: 00007f095158ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007f0951611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f09517c6128 R14: 00007f09517c6090 R15: 00007fffde07db48
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 cbcc7fb1a3c48ec238a6a34dd578fa775d2dddba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 cbcc7fb1a3c48ec238a6a34dd578fa775d2dddba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:attach_entity_load_avg+0x37e/0x750 kernel/sched/fair.c:4861
Code: 42 0f b6 04 20 84 c0 0f 85 74 02 00 00 41 01 1e 48 8b 45 90 42 80 3c 20 00 48 8b 5d 80 74 08 48 89 df e8 95 92 7d 00 48 8b 1b <4d> 8d b5 a8 00 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c
RSP: 0018:ffffc90000230998 EFLAGS: 00000046
RAX: 1ffff110204e1035 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000062 RSI: ffff888102708188 RDI: ffff88810270819c
RBP: ffffc90000230a20 R08: 0000000000000000 R09: ffff8881f6f4fbc0
R10: 0000000000000000 R11: ffffffff815e0030 R12: dffffc0000000000
R13: ffff8881f6f4fbc0 R14: ffff8881f6f4fc58 R15: 0000000000000400
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f79cf028d58 CR3: 00000001254d6000 CR4: 00000000003526b0
Call Trace:
update_load_avg+0xc7d/0x19a0 kernel/sched/fair.c:4938
enqueue_entity+0x72/0xf90 kernel/sched/fair.c:5529
enqueue_task_fair+0x3fb/0x17e0 kernel/sched/fair.c:7185
enqueue_task+0x7dc/0x11f0 kernel/sched/core.c:2104
__activate_task kernel/sched/core.c:2151 [inline]
activate_task+0x38b/0x3d0 kernel/sched/core.c:2185
ttwu_do_activate+0x154/0x630 kernel/sched/core.c:4209
sched_ttwu_pending+0x1a4/0x3f0 kernel/sched/core.c:4320
csd_do_func kernel/smp.c:134 [inline]
__flush_smp_call_function_queue+0x915/0xc70 kernel/smp.c:587
generic_smp_call_function_single_interrupt+0x17/0x20 kernel/smp.c:457
__sysvec_call_function_single+0x28/0x230 arch/x86/kernel/smp.c:271
instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
sysvec_call_function_single+0x7a/0x90 arch/x86/kernel/smp.c:266
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 c8 f8 7e 42 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 93 01 3b 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c6
RAX: ffff8881f6f00000 RBX: ffff88810366df00 RCX: ffffffff858c50ae
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000040eec
RBP: ffffc900001a7e00 R08: ffff8881f6f39733 R09: 1ffff1103ede72e6
R10: dffffc0000000000 R11: ffffed103ede72e7 R12: 1ffff110206cdbe0
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87cb0b28
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
start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
common_startup_64+0x13b/0x157