rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (1 GPs behind) idle=d9b/1/0x4000000000000002 softirq=10717/10718 fqs=5174
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4746/1:b..l
(detected by 1, t=10502 jiffies, g=13889, q=202954)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5147 Comm: syz.4.47 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:perf_prepare_sample+0x96a/0x1cb0 kernel/events/core.c:7692
Code: c7 8d 1c c5 08 00 00 00 eb 09 e8 31 37 e1 ff 66 bb 08 00 48 8b 44 24 30 42 0f b6 04 20 84 c0 0f 85 d9 0e 00 00 66 41 01 5d 00 <4c> 89 f6 48 81 e6 00 20 00 00 31 ff e8 e5 3a e1 ff 4c 89 f0 48 25
RSP: 0018:ffffc9000366f0a0 EFLAGS: 00000093
RAX: ffffffff8197bb0d RBX: ffffc9000366f240 RCX: ffff888025948000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000366f190 R08: ffffc9000366f217 R09: ffffc9000366f1e0
R10: dffffc0000000000 R11: fffff520006cde43 R12: dffffc0000000000
R13: ffffc9000366f246 R14: 0000000000000000 R15: ffffc9000366f400
FS: 00007f799b8d56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf068005c0 CR3: 000000001edb0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__perf_event_output kernel/events/core.c:7802 [inline]
perf_event_output_forward+0x185/0x2e0 kernel/events/core.c:7822
__perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515
perf_swevent_overflow kernel/events/core.c:9591 [inline]
perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9629
perf_tp_event+0x324/0xbe0 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 c2 22 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc9000366f820 EFLAGS: 00000206
RAX: 6f0ef2212207a500 RBX: 1ffff920006cdf08 RCX: 6f0ef2212207a500
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a79c980
RBP: ffffc9000366f900 R08: ffff8880b903b30b R09: 1ffff11017207661
R10: dffffc0000000000 R11: ffffed1017207662 R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
mod_objcg_mlstate+0x23b/0x2e0 mm/memcontrol.c:832
mod_objcg_state+0x312/0x5e0 mm/memcontrol.c:3143
memcg_slab_post_alloc_hook mm/slab.h:322 [inline]
slab_post_alloc_hook+0x2aa/0x380 mm/slab.h:526
slab_alloc_node mm/slub.c:3225 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238
kmem_cache_zalloc include/linux/slab.h:728 [inline]
__alloc_file+0x25/0x240 fs/file_table.c:132
alloc_empty_file+0x90/0x180 fs/file_table.c:181
alloc_file+0x5c/0x510 fs/file_table.c:223
alloc_file_pseudo+0x180/0x200 fs/file_table.c:263
__anon_inode_getfile fs/anon_inodes.c:109 [inline]
anon_inode_getfile+0xc1/0x1a0 fs/anon_inodes.c:147
__do_sys_perf_event_open kernel/events/core.c:12613 [inline]
__se_sys_perf_event_open+0xc02/0x1bb0 kernel/events/core.c:12387
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f799c271e79
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:00007f799b8d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f799c4dcfa0 RCX: 00007f799c271e79
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 00002000000003c0
RBP: 00007f799c304ee0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f799c4dd038 R14: 00007f799c4dcfa0 R15: 00007ffda417aff8
task:kworker/0:9 state:R running task stack:23440 pid: 4746 ppid: 2 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__local_bh_enable_ip+0x147/0x1c0 kernel/softirq.c:408
rcu_read_unlock_bh include/linux/rcupdate.h:810 [inline]
ip6_finish_output2+0x111c/0x1530 net/ipv6/ip6_output.c:131
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xb7a/0x1410 net/ipv6/ndisc.c:513
addrconf_dad_completed+0x75f/0xc80 net/ipv6/addrconf.c:4278
addrconf_dad_work+0xc83/0x1530 net/ipv6/addrconf.c:-1
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287