rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5960/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=13365, q=1078 ncpus=2)
task:syz-executor state:R running task stack:19496 pid:5960 tgid:5960 ppid:5958 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:60 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg+0xc3/0x230 arch/x86/kernel/unwind_orc.c:419
Code: 85 3c 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c3 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 49 8d 40 08 48 39 d8 0f 97 c1 <4c> 39 f0 0f 96 c0 84 c1 0f 85 c3 00 00 00 49 8d 7f 28 48 89 f8 48
RSP: 0018:ffffc90003e2f560 EFLAGS: 00000202
RAX: ffffc90003e2fb98 RBX: ffffc90003e28000 RCX: 0000000000000001
RDX: ffffc90003e2f6c8 RSI: dffffc0000000000 RDI: ffffc90003e2f688
RBP: 1ffff920007c5ed1 R08: ffffc90003e2fb90 R09: 0000000000000000
R10: ffffc90003e2f6d8 R11: fffff520007c5edd R12: 1ffff920007c5ed2
R13: 1ffff920007c5ed3 R14: ffffc90003e30000 R15: ffffc90003e2f688
unwind_next_frame+0x18cc/0x23d0 arch/x86/kernel/unwind_orc.c:-1
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6670 [inline]
kfree+0x1c0/0x660 mm/slub.c:6878
__do_replace+0x7a2/0x980 net/ipv6/netfilter/ip6_tables.c:1101
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0xa16/0xce0 net/ipv6/netfilter/ip6_tables.c:1644
nf_setsockopt+0x26f/0x290 net/netfilter/nf_sockopt.c:101
do_sock_setsockopt+0x17c/0x1b0 net/socket.c:2337
__sys_setsockopt net/socket.c:2362 [inline]
__do_sys_setsockopt net/socket.c:2368 [inline]
__se_sys_setsockopt net/socket.c:2365 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2365
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc510f9163a
RSP: 002b:00007ffeee49e468 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffeee49e4f0 RCX: 00007fc510f9163a
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000002e8 R09: 0079746972756365
R10: 00007fc5111b7140 R11: 0000000000000206 R12: 00007fc5111b70e0
R13: 00007ffeee49e48c R14: 0000000000000000 R15: 00007fc5111b7e60
rcu: rcu_preempt kthread starved for 10042 jiffies! g13365 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:27128 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5256 [inline]
__schedule+0x14bc/0x5000 kernel/sched/core.c:6863
__schedule_loop kernel/sched/core.c:6945 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6960
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+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6083 Comm: syz.1.30 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_apic_msr_write+0x39/0x50 arch/x86/include/asm/apic.h:212
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 c3 cc cc cc cc cc f3 0f 1e fa 89 f6 31 d2 e9 f2 be 5e 03 66
RSP: 0018:ffffc90003ac7a90 EFLAGS: 00000046
RAX: 000000000000008b RBX: ffff8880b8723e40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000008b RDI: 0000000000000838
RBP: 0000000000000000 R08: ffffffff81afb115 R09: ffffffff99d32508
R10: 0000000000000003 R11: ffffffff8171cb10 R12: 00000000100058eb
R13: dffffc0000000000 R14: 000000000000008b R15: 0000000000000020
FS: 00007faedb4716c0(0000) GS:ffff888125ae6000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557ce8bc5730 CR3: 00000000331ea000 CR4: 00000000003526f0
Call Trace:
apic_write arch/x86/include/asm/apic.h:409 [inline]
lapic_next_event+0x11/0x20 arch/x86/kernel/apic/apic.c:418
clockevents_program_event+0x1c9/0x350 kernel/time/clockevents.c:334
hrtimer_start_range_ns+0xd8a/0x1080 kernel/time/hrtimer.c:1323
__posixtimer_deliver_signal kernel/time/posix-timers.c:321 [inline]
posixtimer_deliver_signal+0x1cf/0x410 kernel/time/posix-timers.c:347
dequeue_signal+0x24a/0x370 kernel/signal.c:660
get_signal+0x55e/0x1340 kernel/signal.c:2914
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faeda45f0e9
Code: 48 89 3c 25 c0 fe ff ff eb 20 0f 1f 80 00 00 00 00 45 31 c0 31 c9 ba 80 00 00 00 48 89 de bf ca 00 00 00 31 c0 e8 47 06 13 00 <8b> 03 85 c0 74 e1 c7 45 08 00 00 00 00 45 84 e4 74 2d 80 3d e3 65
RSP: 002b:00007faedb4710f0 EFLAGS: 00000207
RAX: 0000000000000001 RBX: 00007faeda7e5fa8 RCX: 00007faeda58f749
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007faeda7e5fac
RBP: 00007faeda7e5fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faeda7e6038 R14: 00007ffe35624080 R15: 00007ffe35624168