rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=21553, q=703 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10486 (4294965307-4294954821), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10486 jiffies! g21553 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26664 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 8163 Comm: syz.0.988 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:444 [inline]
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
RIP: 0010:rcu_is_watching+0x5a/0xb0 kernel/rcu/tree.c:700
Code: f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 ac a2 6e 00 48 c7 c3 a8 6b 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 2f 8b 03 65 ff 0d 11 01 93 7e 74 0c 83 e0 04 c1 e8 02 5b
RSP: 0018:ffffc90000006c28 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: ffff8880b8e36ba8 RCX: 4eee6f26660a8000
RDX: ffff88802193bc00 RSI: ffffffff8b1cf800 RDI: ffffffff8b1cf7c0
RBP: 0000000000000001 R08: dffffc0000000000 R09: 1ffffffff223cea0
R10: dffffc0000000000 R11: fffffbfff223cea1 R12: ffffffff8aa000d0
R13: 00000000ffffffff R14: ffffffff8ca90a30 R15: dffffc0000000000
FS: 00007f8a4d67d6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000d6000 CR3: 0000000062f1c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
rcu_read_lock include/linux/rcupdate.h:787 [inline]
is_bpf_text_address+0x64/0x2a0 kernel/bpf/core.c:741
kernel_text_address+0xa0/0xd0 kernel/extable.c:125
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x5d/0xc0 arch/x86/kernel/unwind_orc.c:369
arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node_track_caller+0xb4/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
alloc_skb_with_frags+0xcd/0x7a0 net/core/skbuff.c:6340
sock_alloc_send_pskb+0x883/0x9a0 net/core/sock.c:2830
sock_alloc_send_skb include/net/sock.h:1954 [inline]
__ip_append_data+0x2a15/0x3be0 net/ipv4/ip_output.c:1127
ip_append_data+0x10d/0x180 net/ipv4/ip_output.c:1372
icmp_push_reply+0x87/0x410 net/ipv4/icmp.c:377
__icmp_send+0x1100/0x1430 net/ipv4/icmp.c:801
ipv4_send_dest_unreach net/ipv4/route.c:1263 [inline]
ipv4_link_failure+0x638/0xa20 net/ipv4/route.c:1270
dst_link_failure include/net/dst.h:437 [inline]
arp_error_report+0x112/0x160 net/ipv4/arp.c:296
neigh_invalidate+0x23b/0x460 net/core/neighbour.c:1064
neigh_timer_handler+0x911/0xff0 net/core/neighbour.c:1151
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x570/0x810 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x27d/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 51 81 c8 f6 e8 8c 6d f9 f6 fb bf 01 00 00 00 31 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc900048bfda0 EFLAGS: 00000286
RAX: 4eee6f26660a8000 RBX: 0000000000000000 RCX: 4eee6f26660a8000
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc900048bfe40 R08: ffffffff8e8c6e6f R09: 1ffffffff1d18dcd
R10: dffffc0000000000 R11: fffffbfff1d18dce R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000917fb4
irqentry_exit+0x67/0x70 kernel/entry/common.c:438
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 70 b5 01 f7 e8 2b b5 01 f7 fb 65 48 8b 05 52 19 78 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 cd 00 e8 f6 48
RSP: 0018:ffffc900048bff08 EFLAGS: 00000286
RAX: ffff88802193bc00 RBX: 000000000000002e RCX: 4eee6f26660a8000
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: ffffffff8b1cf820
RBP: ffffc900048bff48 R08: ffffffff8e8c6e6f R09: 1ffffffff1d18dcd
R10: dffffc0000000000 R11: fffffbfff1d18dce R12: 0000000000000000
R13: 0000000000000000 R14: ffffc900048bff58 R15: 0000000000000000
do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8a4c79de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8a4d67d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8a4ca26090 RCX: 00007f8a4c79de59
RDX: 0000000000000000 RSI: 00002000000011c0 RDI: ffffffffffffffff
RBP: 00007f8a4c833e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8a4ca26128 R14: 00007f8a4ca26090 R15: 00007ffd3da4cd28