rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (0 ticks this GP) idle=558c/1/0x4000000000000000 softirq=17161/17161 fqs=3
rcu: (detected by 1, t=10502 jiffies, g=9461, q=350 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5970 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:memset_orig+0x15/0xb0 arch/x86/lib/memset_64.S:57
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 48 0f af c1 <41> 89 f9 41 83 e1 07 75 74 48 89 d1 48 c1 e9 06 74 39 66 0f 1f 84
RSP: 0018:ffffc90000007ca0 EFLAGS: 00000006
RAX: 0000000000000000 RBX: ffffffff8bacf580 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000007cb0
RBP: ffffc90000007e90 R08: ffffc90000007cbf R09: 1ffff92000000f97
R10: ffffc90000007cb0 R11: fffff52000000f98 R12: ffff8880314cd340
R13: dffffc0000000000 R14: 186d5d88f4000000 R15: ffff8880b8627b80
FS: 000055555c28a500(0000) GS:ffff8881259ff000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555c2a55c8 CR3: 00000000773f2000 CR4: 00000000003526f0
Call Trace:
debug_object_deactivate+0x36/0x250 lib/debugobjects.c:863
debug_hrtimer_deactivate kernel/time/hrtimer.c:450 [inline]
debug_deactivate+0x1d/0x200 kernel/time/hrtimer.c:490
__run_hrtimer kernel/time/hrtimer.c:1729 [inline]
__hrtimer_run_queues+0x2b0/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:100 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline]
RIP: 0010:kasan_check_range+0xa5/0x2c0 mm/kasan/generic.c:200
Code: 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 0f 85 de 01 00 00 <49> ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd 83 e5 07 0f 84 b5
RSP: 0018:ffffc90003e6fbc8 EFLAGS: 00000246
RAX: 00000000ffffff01 RBX: ffffffffffffffff RCX: ffffffff819ee892
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88805edee988
RBP: ffffc90003e6fcc0 R08: ffff88805edee98b R09: 1ffff1100bdbdd31
R10: dffffc0000000000 R11: ffffed100bdbdd31 R12: 0000000000000001
R13: ffff88805edee990 R14: ffffed100bdbdd32 R15: 1ffff1100bdbdd31
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock+0x112/0x290 kernel/locking/spinlock_debug.c:116
spin_lock include/linux/spinlock.h:351 [inline]
__d_instantiate+0x197/0x740 fs/dcache.c:1926
d_instantiate+0x6f/0xa0 fs/dcache.c:1963
alloc_path_pseudo fs/file_table.c:367 [inline]
alloc_file_pseudo+0xf6/0x210 fs/file_table.c:379
sock_alloc_file+0xb8/0x2e0 net/socket.c:470
sock_map_fd net/socket.c:500 [inline]
__sys_socket+0x13d/0x1b0 net/socket.c:1740
__do_sys_socket net/socket.c:1745 [inline]
__se_sys_socket net/socket.c:1743 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1743
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3caaf90b07
Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc850182e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f3caaf90b07
RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002
RBP: 00007ffc85018a1c R08: 0000000000000000 R09: 00007ffc85018727
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f3cab184e60
R13: 00007f3cab181280 R14: 0000000000016221 R15: 00007f3cab187020
rcu: rcu_preempt kthread starved for 10485 jiffies! g9461 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27464 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5913 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events fqdir_free_fn
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_single+0x3a9/0x590 kernel/smp.c:687
Code: 33 44 89 f6 83 e6 01 31 ff e8 b3 73 0b 00 41 83 e6 01 75 11 e8 68 6f 0b 00 4d 89 fe eb 3f e8 5e 6f 0b 00 eb 3c 4d 89 fe f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 41 6f 0b 00
RSP: 0018:ffffc9000418f8a0 EFLAGS: 00000293
RAX: ffffffff81b51f8f RBX: ffffc9000418f8e8 RCX: ffff88802e7c5a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000418f998 R08: ffffffff8fc40337 R09: 1ffffffff1f88066
R10: dffffc0000000000 R11: ffffffff81713100 R12: 1ffff92000831f1d
R13: dffffc0000000000 R14: 1ffff92000831f18 R15: 1ffff92000831f18
FS: 0000000000000000(0000) GS:ffff888125aff000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c007c07000 CR3: 0000000076a44000 CR4: 00000000003526f0
Call Trace:
rcu_barrier+0x360/0x570 kernel/rcu/tree.c:3867
fqdir_free_fn+0x33/0x140 net/ipv4/inet_fragment.c:166
process_one_work kernel/workqueue.c:3236 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245