rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-...!: (1 GPs behind) idle=51cc/1/0x4000000000000000 softirq=19982/19985 fqs=0
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P6205/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=12897, q=145 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1078 Comm: kworker/u8:5 Not tainted 6.15.0-rc7-syzkaller-ga11a72229881 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:hlock_class kernel/locking/lockdep.c:233 [inline]
RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4732
Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 e4 07 df 11 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 e0 76 1e 93 eb 48 83 3d fb 96
RSP: 0018:ffffc90000007a88 EFLAGS: 00000047
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008
RDX: 0000000000000008 RSI: ffff8880265e0be0 RDI: ffff8880265e0000
RBP: 0000000000000100 R08: 0000000000000000 R09: 0000000000080000
R10: 0000000000000000 R11: ffffffff84bedb7b R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880265e0c00 R15: ffff8880265e0be0
FS: 0000000000000000(0000) GS:ffff8881260c2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efeb986c286 CR3: 00000000346f4000 CR4: 0000000000350ef0
Call Trace:
mark_usage kernel/locking/lockdep.c:4675 [inline]
__lock_acquire+0x68c/0xd20 kernel/locking/lockdep.c:5189
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162
debug_object_activate+0xbb/0x420 lib/debugobjects.c:818
debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
debug_activate kernel/time/hrtimer.c:484 [inline]
enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1088
__run_hrtimer kernel/time/hrtimer.c:1778 [inline]
__hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:nf_hook_slow+0xc7/0x220 net/netfilter/core.c:627
Code: 48 89 f8 48 c1 e8 03 80 3c 28 00 74 05 e8 91 dc 9b f8 49 8b 3f 48 8b 74 24 08 48 8b 54 24 10 49 89 db 2e e8 8b 3c d3 01 89 c5 <40> 0f b6 dd 48 89 df 48 c7 c6 c0 6f 36 8f e8 c6 e6 39 f8 83 fb 01
RSP: 0018:ffffc90003b0f570 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff8a235900 RCX: d17715ec0083f100
RDX: 0000000000000006 RSI: ffffffff8d74de9a RDI: ffffffff8bc1f3c0
RBP: 0000000000000001 R08: ffffffff8f7f3377 R09: 1ffffffff1efe66e
R10: dffffc0000000000 R11: fffffbfff1efe66f R12: 0000000000000001
R13: ffff8880342d5018 R14: 1ffff1100685aa00 R15: ffff8880342d5020
nf_hook+0x217/0x380 include/linux/netfilter.h:269
NF_HOOK_COND include/linux/netfilter.h:302 [inline]
ip6_output+0x27d/0x3e0 net/ipv6/ip6_output.c:247
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513
ndisc_send_ns+0xcb/0x150 net/ipv6/ndisc.c:671
addrconf_dad_work+0xaae/0x14b0 net/ipv6/addrconf.c:4286
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
task:dhcpcd-run-hook state:R running task stack:26776 pid:6205 tgid:6205 ppid:6191 task_flags:0x400040 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947
preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:391 [inline]
zap_pte_range mm/memory.c:1761 [inline]
zap_pmd_range mm/memory.c:1823 [inline]
zap_pud_range mm/memory.c:1852 [inline]
zap_p4d_range mm/memory.c:1873 [inline]
unmap_page_range+0x3756/0x4210 mm/memory.c:1894
unmap_vmas+0x25d/0x3c0 mm/memory.c:1984
exit_mmap+0x245/0xba0 mm/mmap.c:1284
__mmput+0x118/0x420 kernel/fork.c:1380
exec_mmap+0x6ac/0x7d0 fs/exec.c:1009
begin_new_exec+0x129c/0x2120 fs/exec.c:1264
load_elf_binary+0x96a/0x27a0 fs/binfmt_elf.c:1002
search_binary_handler fs/exec.c:1778 [inline]
exec_binprm fs/exec.c:1810 [inline]
bprm_execve+0x99c/0x1440 fs/exec.c:1862
do_execveat_common+0x510/0x6a0 fs/exec.c:1968
do_execve fs/exec.c:2042 [inline]
__do_sys_execve fs/exec.c:2118 [inline]
__se_sys_execve fs/exec.c:2113 [inline]
__x64_sys_execve+0x94/0xb0 fs/exec.c:2113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efeb97b2107
RSP: 002b:00007ffc9e5eb2f8 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055d269614fe0 RCX: 00007efeb97b2107
RDX: 000055d269615000 RSI: 000055d269614fe0 RDI: 000055d269615088
RBP: 000055d269615088 R08: 00007ffc9e5ede95 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055d269615000
R13: 00007efeb9977e8b R14: 000055d269615000 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10502 jiffies! g12897 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:27496 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x16e2/0x4cd0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6860
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2046
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2248
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153
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: 6204 Comm: syz-executor.0 Not tainted 6.15.0-rc7-syzkaller-ga11a72229881 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline]
RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline]
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe67/0x11c0 kernel/smp.c:885
Code: 00 00 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 80 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 2b 69 0b 00 eb 37 90 43 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 10
RSP: 0018:ffffc90004aff840 EFLAGS: 00000293
RAX: ffffffff81b488c0 RBX: ffff8880b893ad40 RCX: ffff88802a120000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90004aff990 R08: ffffffff8f7f3377 R09: 1ffffffff1efe66e
R10: dffffc0000000000 R11: ffffffff816f6eb0 R12: 1ffff11017108245
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228
FS: 00007f155266b6c0(0000) GS:ffff8881261c2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f67267d3f50 CR3: 000000007ac16000 CR4: 0000000000350ef0
Call Trace:
clock_was_set+0x709/0x7c0 kernel/time/hrtimer.c:976
timekeeping_inject_offset+0x35b/0x4b0 kernel/time/timekeeping.c:1446
do_adjtimex+0x43f/0x9f0 kernel/time/timekeeping.c:2554
do_clock_adjtime kernel/time/posix-timers.c:1170 [inline]
__do_sys_clock_adjtime kernel/time/posix-timers.c:1182 [inline]
__se_sys_clock_adjtime kernel/time/posix-timers.c:1173 [inline]
__x64_sys_clock_adjtime+0x1f7/0x2b0 kernel/time/posix-timers.c:1173
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f155187cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f155266b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f15519abf80 RCX: 00007f155187cda9
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000000
RBP: 00007f15518c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f15519abf80 R15: 00007ffed06cba38