rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 0-....: (2 ticks this GP) idle=7ad/1/0x4000000000000002 softirq=7570/7572 fqs=5171
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1107/1:b..l
(detected by 1, t=10502 jiffies, g=8633, q=221352)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4554 Comm: syz.0.79 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline]
RIP: 0010:rcu_read_unlock_special+0x3a2/0x480 kernel/rcu/tree_plugin.h:670
Code: 00 eb 1d bf 09 00 00 00 e8 9b 20 e4 ff 4c 8b 74 24 10 41 f7 c6 00 02 00 00 74 05 e8 f8 88 19 00 48 c7 44 24 40 00 00 00 00 9c <8f> 44 24 40 f6 44 24 41 02 75 24 f7 44 24 10 00 02 00 00 0f 84 c9
RSP: 0018:ffffc900046def78 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 1ffff920008dbdf4 RCX: ffffffff81645fbf
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801d653b80
RBP: ffffc900046df060 R08: dffffc0000000000 R09: ffffed1003aca771
R10: ffffed1003aca771 R11: 1ffff11003aca770 R12: ffff8880b903b208
R13: dffffc0000000000 R14: ffff8880b903b1c0 R15: 1ffff11017207641
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3102d6df98 CR3: 000000000be8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:772 [inline]
__perf_event_output kernel/events/core.c:7813 [inline]
perf_event_output_forward+0x216/0x280 kernel/events/core.c:7822
__perf_event_overflow+0x364/0x530 kernel/events/core.c:9515
perf_swevent_overflow kernel/events/core.c:9591 [inline]
perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629
perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021
perf_trace_preemptirq_template+0x2be/0x380 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+0x84/0x480 kernel/rcu/tree_plugin.h:674
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900046df760 EFLAGS: 00000206
RAX: 3d16b14f761ae500 RBX: 1ffff920008dbef0 RCX: 3d16b14f761ae500
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc900046df830 R08: dffffc0000000000 R09: fffffbfff1ff5419
R10: fffffbfff1ff5419 R11: 1ffffffff1ff5418 R12: ffffffff8c120c00
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]
__unlock_page_memcg+0xea/0x100 mm/memcontrol.c:2093
zap_pte_range mm/memory.c:1384 [inline]
zap_pmd_range mm/memory.c:1505 [inline]
zap_pud_range mm/memory.c:1534 [inline]
zap_p4d_range mm/memory.c:1555 [inline]
unmap_page_range+0xfbc/0x2520 mm/memory.c:1576
unmap_vmas+0x11b/0x230 mm/memory.c:1653
exit_mmap+0x38f/0x5f0 mm/mmap.c:3216
__mmput+0x115/0x3b0 kernel/fork.c:1127
exit_mm+0x567/0x6c0 kernel/exit.c:550
do_exit+0x5a1/0x20a0 kernel/exit.c:870
do_group_exit+0x12e/0x300 kernel/exit.c:997
__do_sys_exit_group kernel/exit.c:1008 [inline]
__se_sys_exit_group kernel/exit.c:1006 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
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: 0033:0x7f3a43278749
Code: Unable to access opcode bytes at RIP 0x7f3a4327871f.
RSP: 002b:00007ffd65607558 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f3a43278749
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffd656075bc R08: 000000016560764f R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000019
R13: 00000000000927c0 R14: 0000000000029b1b R15: 00007ffd65607610
task:kworker/0:2 state:R running task stack:23488 pid: 1107 ppid: 2 flags:0x00004000
Workqueue: mld mld_ifc_work
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
irqentry_exit+0x63/0x70 kernel/entry/common.c:432
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:103 [inline]
RIP: 0010:__local_bh_enable_ip+0x132/0x1b0 kernel/softirq.c:408
Code: 8a e8 02 85 59 08 65 66 8b 05 8a 25 bb 7e 66 85 c0 75 54 bf 01 00 00 00 e8 ab fe 08 00 e8 66 76 35 00 fb 65 8b 05 36 fc b9 7e <85> c0 75 05 e8 45 07 b8 ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc90004907900 EFLAGS: 00000286
RAX: 0000000080000000 RBX: 0000000000000201 RCX: d34ecb5bc16d8f00
RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800
RBP: ffffc90004907990 R08: dffffc0000000000 R09: fffffbfff1ff542b
R10: fffffbfff1ff542b R11: 1ffffffff1ff542a R12: ffffffff8888f95e
R13: ffffc90004907ae0 R14: dffffc0000000000 R15: 1ffff92000920f20
spin_unlock_bh include/linux/spinlock.h:409 [inline]
rt6_uncached_list_add net/ipv6/route.c:146 [inline]
icmp6_dst_alloc+0x3ee/0x4a0 net/ipv6/route.c:3286
mld_sendpack+0x580/0xc30 net/ipv6/mcast.c:1814
mld_send_cr net/ipv6/mcast.c:2126 [inline]
mld_ifc_work+0x836/0xb40 net/ipv6/mcast.c:2658
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287