rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (10346 ticks this GP) idle=325c/1/0x4000000000000000 softirq=28390/28395 fqs=3447
rcu: hardirqs softirqs csw/system
rcu: number: 1573420 13 0
rcu: cputime: 16384 36105 41 ==> 52520(ms)
rcu: (t=10503 jiffies g=26325 q=1485 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 636 jiffies! g26325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=22897
rcu: rcu_preempt kthread starved for 639 jiffies! g26325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27048 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5393 [inline]
__schedule+0x156f/0x4720 kernel/sched/core.c:6722
schedule+0xbd/0x170 kernel/sched/core.c:6796
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x15e0 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9e/0x400 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5768 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148
Code: f1 33 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d e3 61 50 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9
RSP: 0018:ffffc900042176f8 EFLAGS: 000002d3
RAX: ffffffff813b5538 RBX: 0000000000000003 RCX: ffff888076241e00
RDX: 0000000000000000 RSI: ffffffff8aead140 RDI: ffffffff8b3c5260
RBP: ffffc900042177d0 R08: ffffffff922235c7 R09: 1ffffffff24446b8
R10: dffffc0000000000 R11: fffffbfff24446b9 R12: dffffc0000000000
R13: 0000000000000200 R14: 0000000000000003 R15: 1ffff92000842ee4
FS: 0000555581f0c500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcf3a8dafdf CR3: 000000007626f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline]
kvm_wait+0x23d/0x2a0 arch/x86/kernel/kvm.c:1058
pv_wait arch/x86/include/asm/paravirt.h:598 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x613/0x9c0 kernel/locking/qspinlock.c:511
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:586 [inline]
queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x23e/0x2b0 kernel/locking/spinlock_debug.c:115
spin_lock_bh include/linux/spinlock.h:356 [inline]
lock_sock_nested+0x6a/0x100 net/core/sock.c:3569
lock_sock include/net/sock.h:1784 [inline]
tcp_recvmsg+0x203/0x890 net/ipv4/tcp.c:2607
inet_recvmsg+0x140/0x1f0 net/ipv4/af_inet.c:882
sock_recvmsg_nosec net/socket.c:1047 [inline]
sock_recvmsg net/socket.c:1069 [inline]
sock_read_iter+0x2db/0x3f0 net/socket.c:1139
call_read_iter include/linux/fs.h:2013 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x486/0x990 fs/read_write.c:470
ksys_read+0x151/0x260 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fcf3cb5ac97
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fff94639e60 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000555581f0c500 RCX: 00007fcf3cb5ac97
RDX: 0000000000000004 RSI: 00007fff94639ebc RDI: 0000000000000003
RBP: 00007fff9463a360 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004
R13: 00007fff94639ebc R14: 00007fff94639f50 R15: 0000000000000000
CPU: 1 PID: 8352 Comm: syz.1.854 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:310
Code: c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 15 a0 d5 7b 7e 65 8b 0d a1 d5 7b
RSP: 0018:ffffc900001eef90 EFLAGS: 00000246
RAX: 0000000000000305 RBX: 0000000000000304 RCX: 0000000000000300
RDX: 0000000000000100 RSI: 0000000000000304 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880299f0000 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffc90004187ae0
R13: ffffc900001ef068 R14: ffffc90004187be0 R15: ffffc900001ef078
FS: 00007f13cc4ae6c0(0000) GS:ffff8880b8d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d22f4e8d10 CR3: 000000007a94d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
should_resched arch/x86/include/asm/preempt.h:104 [inline]
unwind_next_frame+0x1d2b/0x2990 arch/x86/kernel/unwind_orc.c:672
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
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_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1833 [inline]
slab_free_freelist_hook+0x154/0x240 mm/slub.c:1859
slab_free mm/slub.c:3853 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3866
skb_kfree_head net/core/skbuff.c:946 [inline]
skb_free_head net/core/skbuff.c:958 [inline]
skb_release_data+0x609/0x7f0 net/core/skbuff.c:988
skb_release_all net/core/skbuff.c:1054 [inline]
__kfree_skb net/core/skbuff.c:1068 [inline]
kfree_skb_reason+0x10e/0x170 net/core/skbuff.c:1104
dev_kfree_skb_any_reason+0x120/0x130 net/core/dev.c:3246
free_old_xmit_skbs+0x11a/0x3b0 drivers/net/virtio_net.c:781
start_xmit+0x16d/0x1470 drivers/net/virtio_net.c:2427
__netdev_start_xmit include/linux/netdevice.h:5003 [inline]
netdev_start_xmit include/linux/netdevice.h:5017 [inline]
xmit_one net/core/dev.c:3671 [inline]
dev_hard_start_xmit+0x269/0x790 net/core/dev.c:3687
sch_direct_xmit+0x251/0x4a0 net/sched/sch_generic.c:345
__dev_xmit_skb net/core/dev.c:3920 [inline]
__dev_queue_xmit+0x19f3/0x3a30 net/core/dev.c:4480
neigh_output include/net/neighbour.h:547 [inline]
ip_finish_output2+0xd97/0x1260 net/ipv4/ip_output.c:235
NF_HOOK_COND include/linux/netfilter.h:305 [inline]
ip_output+0x29f/0x440 net/ipv4/ip_output.c:436
dst_output include/net/dst.h:470 [inline]
ip_local_out net/ipv4/ip_output.c:129 [inline]
__ip_queue_xmit+0x1056/0x1960 net/ipv4/ip_output.c:540
__tcp_transmit_skb+0x1dd6/0x3470 net/ipv4/tcp_output.c:1427
tcp_ack_snd_check net/ipv4/tcp_input.c:5774 [inline]
tcp_rcv_established+0xb30/0x1dd0 net/ipv4/tcp_input.c:6221
tcp_v4_do_rcv+0x6d3/0xba0 net/ipv4/tcp_ipv4.c:1741
tcp_v4_rcv+0x2358/0x2a60 net/ipv4/tcp_ipv4.c:2173
ip_protocol_deliver_rcu+0x20a/0x3f0 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x2c3/0x510 net/ipv4/ip_input.c:233
NF_HOOK+0x32d/0x3b0 include/linux/netfilter.h:316
dst_input include/net/dst.h:480 [inline]
ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline]
ip_list_rcv_finish net/ipv4/ip_input.c:631 [inline]
ip_sublist_rcv+0xa36/0xd60 net/ipv4/ip_input.c:639
ip_list_rcv+0x3ed/0x440 net/ipv4/ip_input.c:674
__netif_receive_skb_list_ptype net/core/dev.c:5753 [inline]
__netif_receive_skb_list_core+0x582/0x770 net/core/dev.c:5801
__netif_receive_skb_list net/core/dev.c:5853 [inline]
netif_receive_skb_list_internal+0x943/0xca0 net/core/dev.c:5944
gro_normal_list include/net/gro.h:452 [inline]
napi_complete_done+0x329/0x820 net/core/dev.c:6284
virtqueue_napi_complete drivers/net/virtio_net.c:451 [inline]
virtnet_poll+0xb6e/0x1300 drivers/net/virtio_net.c:2243
__napi_poll+0xbb/0x460 net/core/dev.c:6714
napi_poll net/core/dev.c:6781 [inline]
net_rx_action+0x65f/0xcc0 net/core/dev.c:6917
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:__schedule+0x157f/0x4720 kernel/sched/core.c:6728
Code: 28 00 74 08 4c 89 f7 e8 cf e7 40 f7 4d 89 26 48 89 df 4c 89 e6 e8 a1 4b 60 f6 48 89 c7 e8 b9 13 be f6 48 8b 84 24 98 00 00 00 <66> 42 c7 44 28 12 f8 f8 48 c7 84 24 00 01 00 00 0e 36 e0 45 4a c7
RSP: 0018:ffffc90004187680 EFLAGS: 00000286
RAX: 1ffff92000830ef0 RBX: ffff8880299f0000 RCX: 24a466016af42200
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: ffff8880299f1600
RBP: ffffc90004187890 R08: ffffffff92223607 R09: 1ffffffff24446c0
R10: dffffc0000000000 R11: fffffbfff24446c1 R12: ffff888076241e00
R13: dffffc0000000000 R14: ffff8880b8d3c250 R15: ffff8880b8d3cf88
preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7032
irqentry_exit+0x67/0x70 kernel/entry/common.c:441
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule+0xc0/0xd0 kernel/sched/core.c:-1
Code: 0e 36 e0 45 4a c7 04 33 00 00 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 75 10 48 8d 65 f0 5b 41 5e 5d c3 e8 10 00 00 00 d0 e8 c9 ac f7 ff 66 0f 1f 84 00 00 00 00 00 41 57 41 56 53 49
RSP: 0018:ffffc90004187a00 EFLAGS: 00000246
RAX: 1ffff1100533e000 RBX: 1ffff92000830f40 RCX: 24a466016af42200
RDX: dffffc0000000000 RSI: ffffffff8aead140 RDI: ffffffff8b3c5260
RBP: ffffc90004187a78 R08: ffffffff92223607 R09: 1ffffffff24446c0
R10: dffffc0000000000 R11: fffffbfff24446c1 R12: 0000000000000000
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff92000830f60
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2959
__do_sys_perf_event_open kernel/events/core.c:12952 [inline]
__se_sys_perf_event_open+0x180d/0x1d40 kernel/events/core.c:12594
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f13cb59fb19
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:00007f13cc4ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f13cb826090 RCX: 00007f13cb59fb19
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000005c0
RBP: 00007f13cb637b70 R08: 0000000000000002 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f13cb826128 R14: 00007f13cb826090 R15: 00007ffe090e7f78