rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P11398
rcu: (detected by 0, t=10502 jiffies, g=45885, q=812 ncpus=2)
task:syz.2.1573 state:R running task stack:21928 pid:11398 ppid:5766 flags:0x00004006
Call Trace:
sched_show_task+0x481/0x5a0 kernel/sched/core.c:9178
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:261 [inline]
print_other_cpu_stall+0xfa7/0x1340 kernel/rcu/tree_stall.h:637
check_cpu_stall kernel/rcu/tree_stall.h:809 [inline]
rcu_pending kernel/rcu/tree.c:3950 [inline]
rcu_sched_clock_irq+0x87c/0x1220 kernel/rcu/tree.c:2295
update_process_times+0x147/0x1b0 kernel/time/timer.c:2072
tick_sched_handle kernel/time/tick-sched.c:254 [inline]
tick_sched_timer+0x3a2/0x580 kernel/time/tick-sched.c:1492
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x4df/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x0/0x120 kernel/rcu/tree.c:4222
Code: df e8 24 17 6d 00 4c 85 3b 0f 95 c0 5b 41 5e 41 5f c3 89 fe 89 fb 48 c7 c7 c0 4d d3 8c e8 d8 1c e2 02 89 df e9 53 ff ff ff 90 0f 1e fa 41 57 41 56 53 65 8b 0d 08 ce 93 7e b0 01 f7 c1 00 00
RSP: 0018:ffffc90000007048 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 5cb228b13c0d5200
RDX: ffff888077e49e00 RSI: ffffffff8afc6f60 RDI: ffffffff8afc6f20
RBP: 1ffff1100bf25595 R08: ffffc90000007360 R09: ffffc90000007370
R10: ffffc900000071c0 R11: fffff52000000e3a R12: 0000000000000001
R13: 0000000000000003 R14: 1ffff1100bf25597 R15: ffff88805f92acbf
rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
rcu_read_lock_held+0x1e/0x40 kernel/rcu/update.c:348
__in6_dev_get include/net/addrconf.h:323 [inline]
ip6_ignore_linkdown include/net/addrconf.h:414 [inline]
find_match+0xf1/0xc80 net/ipv6/route.c:782
__find_rr_leaf+0x23b/0x6c0 net/ipv6/route.c:870
find_rr_leaf net/ipv6/route.c:891 [inline]
rt6_select net/ipv6/route.c:935 [inline]
fib6_table_lookup+0x3a0/0xa70 net/ipv6/route.c:2221
ip6_pol_route+0x22d/0x1160 net/ipv6/route.c:2257
pol_lookup_func include/net/ip6_fib.h:578 [inline]
__fib6_rule_action net/ipv6/fib6_rules.c:233 [inline]
fib6_rule_action+0x1d2/0x6d0 net/ipv6/fib6_rules.c:271
fib_rules_lookup+0x5c7/0xb20 net/core/fib_rules.c:318
fib6_rule_lookup+0x18a/0x510 net/ipv6/fib6_rules.c:108
ip6_route_input_lookup net/ipv6/route.c:2326 [inline]
ip6_route_input+0x6cf/0xa50 net/ipv6/route.c:2622
ip6_rcv_finish+0x143/0x230 net/ipv6/ip6_input.c:77
NF_HOOK+0x303/0x390 include/linux/netfilter.h:304
__netif_receive_skb_one_core net/core/dev.c:5608 [inline]
__netif_receive_skb+0xcc/0x290 net/core/dev.c:5722
process_backlog+0x380/0x6e0 net/core/dev.c:6050
__napi_poll+0xc0/0x460 net/core/dev.c:6612
napi_poll net/core/dev.c:6679 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 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:finish_task_switch+0x26a/0x920 kernel/sched/core.c:5254
Code: 0f 84 37 01 00 00 48 85 db 0f 85 56 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 80 ca 14 09 e8 4b a4 2f 00 fb 4c 8b 65 c0 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900036e7638 EFLAGS: 00000282
RAX: 5cb228b13c0d5200 RBX: 0000000000000000 RCX: 5cb228b13c0d5200
RDX: dffffc0000000000 RSI: ffffffff8aaabce0 RDI: ffffffff8afc6f80
RBP: ffffc900036e7690 R08: ffffffff8e4a212f R09: 1ffffffff1c94425
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffff888077e49e00
R13: dffffc0000000000 R14: ffff8880182bda00 R15: ffff8880b8e3cac8
context_switch kernel/sched/core.c:5383 [inline]
__schedule+0x14da/0x44d0 kernel/sched/core.c:6699
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6866
preempt_schedule+0xab/0xc0 kernel/sched/core.c:6890
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
migrate_enable+0x316/0x3c0 kernel/sched/core.c:2452
bpf_test_timer_leave+0x61/0x150 net/bpf/test_run.c:56
bpf_test_run+0x7b7/0x810 net/bpf/test_run.c:428
bpf_prog_test_run_skb+0xa67/0x11c0 net/bpf/test_run.c:1050
bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4129
__sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5491
__do_sys_bpf kernel/bpf/syscall.c:5577 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5575 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5575
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f06b718f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f06b80dd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f06b73e5fa0 RCX: 00007f06b718f749
RDX: 0000000000000028 RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f06b7213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f06b73e6038 R14: 00007f06b73e5fa0 R15: 00007ffc285f7918
rcu: rcu_preempt kthread starved for 1277 jiffies! g45885 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:26824 pid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_timeout+0x160/0x280 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x302/0x1560 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x99/0x380 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11406 Comm: syz.0.1575 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__asan_memset+0x18/0x40 mm/kasan/shadow.c:84
Code: 00 e9 bc ea ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 55 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 01 00 00 00 e8 8e ea ff ff 84 c0 74 11 4c 89 f7 89 ee 48 89 da
RSP: 0018:ffffc900001eede0 EFLAGS: 00000046
RAX: 0000000000000034 RBX: 0000000000000008 RCX: ffffffff818db372
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffe8ffffd9f02c
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1c94426 R12: ffffffff8c7c8a38
R13: dffffc0000000000 R14: ffffe8ffffd9f02c R15: ffffffff8c7c8a38
FS: 00007f5821e1b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f704e6af4ac CR3: 000000002cad2000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
perf_trace_buf_alloc+0x1d2/0x290 kernel/trace/trace_event_perf.c:419
perf_trace_lock_acquire+0x19c/0x3e0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3e2/0x410 kernel/locking/lockdep.c:5725
seqcount_lockdep_reader_access+0xca/0x1c0 include/linux/seqlock.h:102
ktime_get+0x35/0x280 kernel/time/timekeeping.c:846
clockevents_program_event+0xe6/0x310 kernel/time/clockevents.c:326
hrtimer_interrupt+0x5a1/0x9c0 kernel/time/hrtimer.c:1889
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_next_frame+0x751/0x2970 arch/x86/kernel/unwind_orc.c:515
Code: 24 08 88 18 45 0f b7 37 41 83 e6 0f 4c 89 f7 48 c7 c6 60 e7 b9 8c e8 fe ea 4a 00 41 83 fe 05 7f 7b 41 83 fe 03 48 8b 5c 24 30 <0f> 8f e3 00 00 00 41 83 fe 02 0f 84 a3 01 00 00 41 83 fe 03 0f 85
RSP: 0018:ffffc900001ef3d8 EFLAGS: 00000202
RAX: 0000000000000008 RBX: ffffffff8f564538 RCX: 0000000000000003
RDX: ffffffff813aaa82 RSI: ffffffff8cb9e760 RDI: 0000000000000004
RBP: ffffc900001ef4f8 R08: ffff88802abeda00 R09: 0000000000000008
R10: 0000000000000009 R11: 0000000000000100 R12: ffffc900001ef4a8
R13: dffffc0000000000 R14: 0000000000000004 R15: ffffffff8f56453c
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3852
skb_ext_del include/linux/skbuff.h:4786 [inline]
nf_bridge_info_free net/bridge/br_netfilter_hooks.c:152 [inline]
br_nf_dev_queue_xmit+0x48f/0x1b90 net/bridge/br_netfilter_hooks.c:-1
NF_HOOK+0x613/0x6a0 include/linux/netfilter.h:304
br_nf_post_routing+0xb41/0xfb0 net/bridge/br_netfilter_hooks.c:977
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x213/0x3d0 include/linux/netfilter.h:302
br_forward_finish+0xd3/0x130 net/bridge/br_forward.c:66
br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:-1 [inline]
br_nf_forward_finish+0xa33/0xe50 net/bridge/br_netfilter_hooks.c:684
NF_HOOK+0x613/0x6a0 include/linux/netfilter.h:304
br_nf_forward_ip+0xcc1/0x1110 net/bridge/br_netfilter_hooks.c:754
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x213/0x3d0 include/linux/netfilter.h:302
__br_forward+0x41f/0x600 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb5/0x150 net/bridge/br_forward.c:191
br_flood+0x31b/0x680 net/bridge/br_forward.c:237
br_handle_frame_finish+0x143d/0x1950 net/bridge/br_input.c:215
br_nf_hook_thresh+0x3b6/0x480 net/bridge/br_netfilter_hooks.c:1184
br_nf_pre_routing_finish_ipv6+0x9e3/0xd90 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:304 [inline]
br_nf_pre_routing_ipv6+0x34d/0x680 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
br_handle_frame+0x957/0x14c0 net/bridge/br_input.c:424
__netif_receive_skb_core+0xf6b/0x3ac0 net/core/dev.c:5502
__netif_receive_skb_one_core net/core/dev.c:5606 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5722
process_backlog+0x380/0x6e0 net/core/dev.c:6050
__napi_poll+0xc0/0x460 net/core/dev.c:6612
napi_poll net/core/dev.c:6679 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6815
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 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_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x0/0xb0 kernel/rcu/tree.c:699
Code: 0f 84 2c ff ff ff eb 99 e8 ad dc f7 08 48 c7 c7 80 67 d3 8c 4c 89 f6 e8 ce 6a e2 02 e9 53 ff ff ff 66 0f 1f 84 00 00 00 00 00 0f 1e fa 41 57 41 56 53 65 ff 05 f8 1b 94 7e e8 8b f2 f7 08 89
RSP: 0018:ffffc90003a87508 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88802abeda00
RDX: ffff88802abeda00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003a87618 R08: dffffc0000000000 R09: 1ffffffff21b28a0
R10: dffffc0000000000 R11: fffffbfff21b28a1 R12: ffffffff8cbfb130
R13: 1ffff92000750eb0 R14: ffff88802f9a8f80 R15: ffffc90003a875a0
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x15/0x40 kernel/rcu/update.c:348
trace_call_bpf+0x1aa/0x690 kernel/trace/bpf_trace.c:143
perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10263
perf_trace_lock_acquire+0x32a/0x3e0 include/trace/events/lock.h:24
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x3e2/0x410 kernel/locking/lockdep.c:5725
rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
rcu_read_lock include/linux/rcupdate.h:786 [inline]
page_ext_get+0x3e/0x2b0 mm/page_ext.c:508
__reset_page_owner+0x2e/0x190 mm/page_owner.c:145
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
discard_slab mm/slub.c:2127 [inline]
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2667
put_cpu_partial+0x17c/0x250 mm/slub.c:2743
__slab_free+0x31d/0x410 mm/slub.c:3700
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519
kmem_cache_zalloc include/linux/slab.h:711 [inline]
lsm_file_alloc security/security.c:612 [inline]
security_file_alloc+0x34/0x120 security/security.c:2603
init_file+0x94/0x1f0 fs/file_table.c:161
alloc_empty_file+0xb7/0x1d0 fs/file_table.c:210
alloc_file+0x5c/0x600 fs/file_table.c:293
alloc_file_pseudo+0x17e/0x200 fs/file_table.c:336
sock_alloc_file+0xb7/0x280 net/socket.c:469
__sys_socketpair+0x376/0x550 net/socket.c:1809
__do_sys_socketpair net/socket.c:1831 [inline]
__se_sys_socketpair net/socket.c:1828 [inline]
__x64_sys_socketpair+0x9b/0xb0 net/socket.c:1828
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5820f8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5821e1b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f58211e5fa0 RCX: 00007f5820f8f749
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000001
RBP: 00007f5821013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000029c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f58211e6038 R14: 00007f58211e5fa0 R15: 00007ffc3b023e68
bridge0: received packet on ` with own address as source address (addr:aa:aa:aa:aa:aa:20, vlan:0)
bridge0: received packet on ` with own address as source address (addr:aa:aa:aa:aa:aa:20, vlan:0)
bridge0: received packet on ` with own address as source address (addr:aa:aa:aa:aa:aa:20, vlan:0)