INFO: rcu detected stall in macvlan_handle_frame

Status: upstream: reported on 2026/10/03 15:57
Reported-by: syzbot+520906c07e23ebb77bcd@syzkaller.appspotmail.com
First crash: 7d03h, last: 7d03h
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in macvlan_handle_frame net 1 1 2134d 2133d 0/29 auto-closed as invalid on 2021/03/06 19:47
upstream INFO: rcu detected stall in macvlan_handle_frame (2) net 1 1 891d 891d 0/29 auto-obsoleted due to no activity on 2024/07/31 19:33
upstream BUG: soft lockup in macvlan_handle_frame (2) net perf prio:low 1 2 185d 208d 0/29 closed as invalid on 2026/06/03 08:10
upstream BUG: soft lockup in macvlan_handle_frame net 1 1 708d 704d 0/29 auto-obsoleted due to no activity on 2025/02/09 03:55

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 7345 jiffies s: 42289 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 17065 Comm: syz.0.3360 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4802 [inline]
RIP: 0010:__lock_acquire+0x767/0x7ea0 kernel/locking/lockdep.c:5121
Code: 48 c1 e8 03 49 b8 00 00 00 00 00 fc ff df 42 0f b6 04 00 84 c0 0f 85 17 15 00 00 83 3d e1 94 5f 15 00 0f 84 aa 01 00 00 31 db <48> 81 c3 c9 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 00 84 c0 0f
RSP: 0018:ffffc900000071a0 EFLAGS: 00000006
RAX: 0000000000004e00 RBX: ffffffff9049ff00 RCX: ffffffff81640c12
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90b33248
RBP: ffffc900000073e8 R08: dffffc0000000000 R09: 1ffffffff2166649
R10: dffffc0000000000 R11: fffffbfff216664a R12: ffff88801fa764c4
R13: ffff88801fa75a00 R14: 0000000000000002 R15: ffff88801fa76528
FS:  00007fd959fd56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30216ff8 CR3: 0000000064567000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162
 hrtimer_interrupt+0xf4/0x980 kernel/time/hrtimer.c:1858
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
 __sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:queue_work_on+0x1a0/0x1f0 kernel/workqueue.c:1553
Code: 4d 85 e4 75 16 e8 30 22 2e 00 eb 15 e8 29 22 2e 00 e8 f4 94 df 08 4d 85 e4 74 ea e8 1a 22 2e 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 44 05 00 00 00 00 00 41 c7 44
RSP: 0018:ffffc900000077e0 EFLAGS: 00000246
RAX: ffffffff81542466 RBX: 0000000000000000 RCX: ffff88801fa75a00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000078a8 R08: ffffffff8e20d96f R09: 1ffffffff1c41b2d
R10: dffffc0000000000 R11: fffffbfff1c41b2e R12: 0000000000000200
R13: 1ffff92000000f00 R14: 0000000000000000 R15: ffff8880341a4801
 queue_work include/linux/workqueue.h:515 [inline]
 macvlan_broadcast_enqueue drivers/net/macvlan.c:366 [inline]
 macvlan_handle_frame+0xea7/0x1250 drivers/net/macvlan.c:487
 __netif_receive_skb_core+0xfea/0x38c0 net/core/dev.c:5513
 __netif_receive_skb_one_core net/core/dev.c:5617 [inline]
 __netif_receive_skb+0x74/0x290 net/core/dev.c:5733
 process_backlog+0x37c/0x710 net/core/dev.c:6061
 __napi_poll+0xbb/0x460 net/core/dev.c:6628
 napi_poll net/core/dev.c:6695 [inline]
 net_rx_action+0x622/0xbc0 net/core/dev.c:6809
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6875
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 25 61 1c f7 e8 b0 52 4c f7 fb bf 01 00 00 00 <e8> 25 ba ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90003bd7840 EFLAGS: 00000286
RAX: 2a70e67c02594e00 RBX: ffff88801fa75a00 RCX: 2a70e67c02594e00
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: 0000000000000001
RBP: ffffc90003bd78e0 R08: ffff88801fa75a07 R09: 1ffff11003f4eb40
R10: dffffc0000000000 R11: ffffed1003f4eb41 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200077af08
 irqentry_exit+0x63/0x70 kernel/entry/common.c:442
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:obj_cgroup_charge+0x32a/0x620 mm/memcontrol.c:3358
Code: 84 24 80 00 00 00 f7 84 24 80 00 00 00 00 02 00 00 41 c6 44 1f 08 f8 0f 85 21 01 00 00 41 f7 c4 00 02 00 00 74 01 fb 45 31 e4 <80> 7c 24 14 00 0f 85 a0 00 00 00 48 8b 44 24 18 49 89 c6 49 c1 ee
RSP: 0018:ffffc90003bd79a0 EFLAGS: 00000246
RAX: 2a70e67c02594e00 RBX: dffffc0000000000 RCX: 2a70e67c02594e00
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf6de0
RBP: ffffc90003bd7aa0 R08: ffffffff8e20d96f R09: 1ffffffff1c41b2d
R10: dffffc0000000000 R11: fffffbfff1c41b2e R12: 0000000000000000
R13: ffff8880b8e36910 R14: ffff8880b8e36938 R15: 1ffff9200077af3c
 pcpu_memcg_pre_alloc_hook mm/percpu.c:1638 [inline]
 pcpu_alloc+0x21c/0x16b0 mm/percpu.c:1763
 bpf_prog_alloc+0x49/0x1b0 kernel/bpf/core.c:135
 bpf_prog_load+0x7d4/0x1530 kernel/bpf/syscall.c:2597
 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5035
 __do_sys_bpf kernel/bpf/syscall.c:5139 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5137 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5137
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd95bd9e159
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:00007fd959fd5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd95c026090 RCX: 00007fd95bd9e159
RDX: 0000000000000094 RSI: 0000200000000480 RDI: 0000000000000005
RBP: 00007fd95be3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd95c026128 R14: 00007fd95c026090 R15: 00007ffdaa525408
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/03 15:56 linux-6.1.y a500ba24937a 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in macvlan_handle_frame
* Struck through repros no longer work on HEAD.