INFO: rcu detected stall in aoecmd_cfg (3)

Status: upstream: reported on 2026/09/01 17:54
Reported-by: syzbot+93a87a6df68414016c15@syzkaller.appspotmail.com
First crash: 3d11h, last: 3d11h
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in aoecmd_cfg 1 2 736d 826d 0/3 auto-obsoleted due to no activity on 2024/12/07 10:13
linux-5.15 INFO: rcu detected stall in aoecmd_cfg 1 1 383d 383d 0/3 auto-obsoleted due to no activity on 2025/11/25 17:18
linux-6.1 INFO: rcu detected stall in aoecmd_cfg (2) 1 1 193d 193d 0/3 auto-obsoleted due to no activity on 2026/06/03 19:48
upstream INFO: rcu detected stall in aoecmd_cfg block 1 2 2064d 2097d 0/29 auto-closed as invalid on 2021/04/09 11:08
linux-5.15 INFO: rcu detected stall in aoecmd_cfg (2) 1 2 222d 282d 0/3 auto-obsoleted due to no activity on 2026/05/05 06:23
upstream INFO: rcu detected stall in aoecmd_cfg (2) usb block 1 syz, C done 7 736d 849d 28/29 fixed on 2024/10/22 11:57
linux-6.6 INFO: rcu detected stall in aoecmd_cfg 1 1 188d 188d 0/2 auto-obsoleted due to no activity on 2026/06/09 04:24
upstream BUG: soft lockup in aoecmd_cfg (3) prio:low block 1 27 147d 492d 0/29 auto-obsoleted due to no activity on 2026/07/19 06:30
upstream BUG: soft lockup in aoecmd_cfg (2) block 1 3 641d 673d 0/29 auto-obsoleted due to no activity on 2025/03/02 19:34
upstream BUG: soft lockup in aoecmd_cfg block 1 1 960d 956d 0/29 auto-obsoleted due to no activity on 2024/04/17 16:28

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=b2d/1/0x4000000000000000 softirq=35269/35270 fqs=2 
	(t=10500 jiffies g=52185 q=117)
rcu: rcu_preempt kthread starved for 10495 jiffies! g52185 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:26576 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4196 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:434 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x520/0x9b0 kernel/locking/qspinlock.c:508
Code: 8b 44 24 18 c6 00 00 48 8b 44 24 10 42 0f b6 04 28 84 c0 0f 85 1c 01 00 00 48 8d 43 01 c6 00 01 41 bc 00 80 ff ff eb 07 f3 90 <41> ff c4 74 47 43 0f b6 04 2e 84 c0 75 2b 80 3b 00 75 eb 48 89 df
RSP: 0018:ffffc90002faef60 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffffffff8c3dcc60 RCX: aedcee3789114200
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a43c0
RBP: ffffc90002faf058 R08: ffffffff901ef0c7 R09: 1ffffffff203de18
R10: dffffc0000000000 R11: fffffbfff203de19 R12: 00000000ffff9c42
R13: dffffc0000000000 R14: 1ffffffff187b98c R15: ffff8880b9130001
FS:  000055555e59e500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9259fc158 CR3: 0000000062e40000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock+0x265/0x2f0 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:364 [inline]
 alloc_vmap_area+0x1931/0x1b30 mm/vmalloc.c:1564
 __get_vm_area_node+0x14f/0x2d0 mm/vmalloc.c:2430
 __vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
 __vmalloc_node mm/vmalloc.c:3087 [inline]
 vzalloc+0x75/0x80 mm/vmalloc.c:3157
 alloc_counters+0xcc/0x750 net/ipv4/netfilter/arp_tables.c:671
 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:692 [inline]
 get_entries net/ipv4/netfilter/arp_tables.c:876 [inline]
 do_arpt_get_ctl+0xa16/0x1010 net/ipv4/netfilter/arp_tables.c:1469
 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x1219/0x1660 net/ipv4/ip_sockglue.c:1797
 tcp_getsockopt+0x209/0x2530 net/ipv4/tcp.c:4323
 __sys_getsockopt+0x1b0/0x230 net/socket.c:2257
 __do_sys_getsockopt net/socket.c:2272 [inline]
 __se_sys_getsockopt net/socket.c:2269 [inline]
 __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2269
 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: 0033:0x7fe9257ae92a
Code: 48 83 ec 10 89 d2 48 63 ff 45 31 c9 6a 2a 45 31 c0 31 c9 e8 d8 99 fb ff 48 83 c4 18 c3 0f 1f 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff f7
RSP: 002b:00007ffff369e8b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe9257ae92a
RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffff369e920 R08: 00007ffff369e8cc R09: 0000000000000000
R10: 00007ffff369e920 R11: 0000000000000212 R12: 00007ffff369e8cc
R13: 00007fe925844a72 R14: 000000000005ba09 R15: 00007ffff369f010
 </TASK>
NMI backtrace for cpu 0
CPU: 0 PID: 12193 Comm: syz.0.2651 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22d/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31f/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ec/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:unwind_next_frame+0x14c6/0x1cf0 arch/x86/kernel/unwind_orc.c:626
Code: c0 0f 84 2f 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 30 0f b6 04 01 84 c0 0f 85 df 01 00 00 c7 03 00 00 00 00 31 c0 <48> 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 c7 c5 2c 05 96 8d
RSP: 0018:ffffc900000075f0 EFLAGS: 00000202
RAX: 0000000000000101 RBX: ffffc90000007688 RCX: 0000000000000101
RDX: ffffc90000007601 RSI: ffffc900032eff48 RDI: 00000000ffffffff
RBP: dffffc0000000000 R08: ffffc900032eff48 R09: ffffc900000076d8
R10: dffffc0000000000 R11: fffff52000000edd R12: ffffc900032e8000
R13: dffffc0000000000 R14: ffffc90000007698 R15: ffffc900032eff58
 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522
 kmalloc_reserve net/core/skbuff.c:356 [inline]
 __alloc_skb+0x22c/0x750 net/core/skbuff.c:427
 alloc_skb include/linux/skbuff.h:1162 [inline]
 new_skb drivers/block/aoe/aoecmd.c:67 [inline]
 aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:431 [inline]
 aoecmd_cfg+0x282/0x910 drivers/block/aoe/aoecmd.c:1371
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:find_va_links mm/vmalloc.c:889 [inline]
RIP: 0010:insert_vmap_area+0x9a/0x370 mm/vmalloc.c:1045
Code: 00 48 89 5c 24 18 4c 8b 3b 49 8d 5d f8 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 0d 6f 0b 00 4d 8d 75 f0 4c 8b 23 <48> 8b 3c 24 4c 89 e6 e8 ba 48 c6 ff 4c 89 f5 48 c1 ed 03 48 b8 00
RSP: 0018:ffffc900032ef868 EFLAGS: 00000246
RAX: 1ffff11029324715 RBX: ffff8881499238a8 RCX: 0000000000080000
RDX: ffffc90005969000 RSI: 0000000000020049 RDI: 000000000002004a
RBP: ffffc900032efa28 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200065df08 R12: ffffc90007dfc000
R13: ffff8881499238b0 R14: ffff8881499238a0 R15: ffffc9000118f000
 alloc_vmap_area+0x1939/0x1b30 mm/vmalloc.c:1565
 __get_vm_area_node+0x14f/0x2d0 mm/vmalloc.c:2430
 __vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
 __vmalloc_node mm/vmalloc.c:3087 [inline]
 __vmalloc+0x76/0x80 mm/vmalloc.c:3101
 bpf_prog_alloc_no_stats+0x36/0x2c0 kernel/bpf/core.c:90
 bpf_prog_alloc+0x1a/0x1e0 kernel/bpf/core.c:124
 bpf_prog_load+0x7d1/0x14e0 kernel/bpf/syscall.c:2301
 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657
 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4759 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759
 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: 0033:0x7f6df6d21159
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:00007f6df4f79028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f6df6fa8fa0 RCX: 00007f6df6d21159
RDX: 0000000000000080 RSI: 0000200000000340 RDI: 0000000000000005
RBP: 00007f6df6db8024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6df6fa9038 R14: 00007f6df6fa8fa0 R15: 00007ffdfa2393c8
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/01 17:54 linux-5.15.y 28c35638ec51 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-perf INFO: rcu detected stall in aoecmd_cfg
* Struck through repros no longer work on HEAD.