INFO: rcu detected stall in sys_bpf

Status: upstream: reported C repro on 2024/04/20 10:27
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+66feb346d5c375250c6e@syzkaller.appspotmail.com
First crash: 930d, last: 7d16h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2026/05/06 linux-6.1.y (ToT) 4931e0e1673d C [report] INFO: rcu detected stall in sys_epoll_wait
2026/05/06 upstream (ToT) 74fe02ce122a C Didn't crash
▶ ▼ Similar bugs (19)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in sys_bpf (5) bpf 1 syz, C unreliable 56 1749d 1842d 0/29 closed as invalid on 2022/02/08 10:34
upstream INFO: rcu detected stall in sys_bpf (9) bpf 1 syz, C error 74 652d 892d 0/29 auto-obsoleted due to no activity on 2025/04/03 05:23
linux-5.15 INFO: rcu detected stall in sys_bpf (2) origin:lts-only 1 syz, C error 376 3h30m 941d 0/3 upstream: reported C repro on 2024/04/09 19:57
upstream INFO: rcu detected stall in sys_bpf (3) bpf 1 4 2494d 2494d 0/29 closed as invalid on 2020/01/09 08:13
linux-5.15 INFO: rcu detected stall in sys_bpf 1 2 1065d 1107d 0/3 auto-obsoleted due to no activity on 2024/03/16 17:33
upstream INFO: rcu detected stall in sys_bpf bpf net 1 3 2660d 2781d 0/29 auto-closed as invalid on 2019/11/23 00:18
upstream INFO: rcu detected stall in sys_bpf (2) bpf 1 12 2529d 2530d 0/29 closed as invalid on 2019/12/04 14:14
upstream INFO: rcu detected stall in sys_bpf (8) bpf 1 1 1083d 1083d 0/29 auto-obsoleted due to no activity on 2024/02/17 03:10
linux-4.19 INFO: rcu detected stall in sys_bpf 1 3 2478d 2607d 0/1 auto-closed as invalid on 2020/05/23 14:47
upstream BUG: soft lockup in sys_bpf prio:low mm 1 syz, C error 301 19h35m 562d 0/29 upstream: reported C repro on 2025/04/23 05:48
upstream INFO: rcu detected stall in sys_bpf (6) net 1 7 1560d 1710d 0/29 auto-obsoleted due to no activity on 2022/10/28 06:32
upstream INFO: rcu detected stall in sys_bpf (4) bpf net 1 3 2447d 2486d 0/29 auto-closed as invalid on 2020/05/24 13:03
linux-6.6 INFO: rcu detected stall in sys_bpf origin:lts-only 1 syz, C inconclusive 118 4d01h 453d 0/2 upstream: reported C repro on 2025/08/10 11:50
android-54 BUG: soft lockup in sys_bpf 1 1 630d 630d 0/2 auto-obsoleted due to no activity on 2025/05/15 12:21
android-5-15 BUG: soft lockup in sys_bpf origin:upstream 1 syz, C error 108 785d 952d 0/2 upstream: reported C repro on 2024/03/29 12:25
android-5-10 BUG: soft lockup in sys_bpf (3) 1 2 138d 141d 0/2 auto-obsoleted due to no activity on 2026/09/19 15:02
android-5-10 BUG: soft lockup in sys_bpf 1 2 865d 869d 0/2 auto-obsoleted due to no activity on 2024/09/22 11:37
android-5-10 BUG: soft lockup in sys_bpf (4) 1 4 7d13h 41d 0/2 premoderation: reported on 2026/09/26 08:05
android-5-10 BUG: soft lockup in sys_bpf (2) 1 1 298d 298d 0/2 auto-obsoleted due to no activity on 2026/04/12 02:06
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2026/07/27 17:01 2h43m fix candidate upstream OK (0) job log
2025/11/09 17:26 2h10m fix candidate upstream OK (0) job log

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2675 jiffies s: 13529 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: 6211 Comm: syz.0.1711 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_preemption_disabled+0x3/0x110 lib/smp_processor_id.c:13
Code: bc 8c 4c 89 f6 e8 9d 65 0b fa e9 6e ff ff ff 00 00 cc cc 00 00 cc cc 48 c7 c7 40 68 df 8a 48 c7 c6 80 68 df 8a eb 00 55 41 57 <41> 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65
RSP: 0018:ffffc90000007a00 EFLAGS: 00000046
RAX: d7a9fedd0a6dc800 RBX: ffffc90000007a38 RCX: d7a9fedd0a6dc800
RDX: 1ffffffff1f44800 RSI: ffffffff8a8b0ec0 RDI: ffffffff8adf68a0
RBP: 0000000000000000 R08: ffffffff8fa24008 R09: ffffffff8fa24018
R10: ffffffff8fa24010 R11: ffffffff8fa24003 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555562b96500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f463fff CR3: 000000002ebac000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 irq_exit_rcu+0x11/0x20 kernel/softirq.c:693
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x4f/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
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 32 7b 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007ae0 EFLAGS: 00000206
RAX: d7a9fedd0a6dc800 RBX: 1ffff92000000f64 RCX: d7a9fedd0a6dc800
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0
RBP: ffffc90000007bd0 R08: ffffffff90b0f24f R09: 1ffffffff2161e49
R10: dffffc0000000000 R11: fffffbfff2161e4a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3bb00 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2148
 __run_hrtimer kernel/time/hrtimer.c:1751 [inline]
 __hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
 hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
 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:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_release+0x156/0x920 kernel/locking/lockdep.c:5694
Code: 00 00 83 3b 00 0f 85 6b 04 00 00 4c 89 74 24 08 43 c6 44 2f 08 00 48 c7 84 24 a0 00 00 00 00 00 00 00 9c 8f 84 24 a0 00 00 00 <48> 8b 84 24 a0 00 00 00 48 89 44 24 50 43 c6 44 2f 08 f8 fa 48 c7
RSP: 0018:ffffc90004747600 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888027490adc RCX: d7a9fedd0a6dc800
RDX: 0000000000000000 RSI: ffffffff8adf6880 RDI: ffffffff8adf6840
RBP: ffffc90004747720 R08: ffffffff8e20b46f R09: 1ffffffff1c4168d
R10: dffffc0000000000 R11: fffffbfff1c4168e R12: ffff88801f7a3ea0
R13: dffffc0000000000 R14: ffff888027490000 R15: 1ffff920008e8ecc
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 alloc_vmap_area+0x171b/0x18d0 mm/vmalloc.c:1705
 __get_vm_area_node+0x158/0x330 mm/vmalloc.c:2570
 __vmalloc_node_range+0x357/0x1380 mm/vmalloc.c:3260
 __vmalloc_node mm/vmalloc.c:3365 [inline]
 __vmalloc+0x76/0x80 mm/vmalloc.c:3379
 bpf_prog_alloc_no_stats+0x37/0x3a0 kernel/bpf/core.c:93
 bpf_prog_alloc+0x1c/0x1b0 kernel/bpf/core.c:131
 bpf_prog_load+0x7d4/0x1530 kernel/bpf/syscall.c:2597
 __sys_bpf+0x5b8/0x780 kernel/bpf/syscall.c:5032
 __do_sys_bpf kernel/bpf/syscall.c:5136 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5134 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5134
 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: 0033:0x7fa7bc39e159
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:00007fff1634fdf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa7bc625fa0 RCX: 00007fa7bc39e159
RDX: 0000000000000094 RSI: 0000200000000680 RDI: 0000000000000005
RBP: 00007fa7bc43506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa7bc625fac R14: 00007fa7bc625fa0 R15: 00007fa7bc625fa0
 </TASK>

Crashes (351):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/01 11:56 linux-6.1.y 1a8763b93150 38f7f0d1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/05/01 22:45 linux-6.1.y 4931e0e1673d 753c55b9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/27 21:46 linux-6.1.y 79807e970724 96923c60 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/02/14 14:14 linux-6.1.y 8ce36b2849ef 1e62d198 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/01/19 07:28 linux-6.1.y cd9b81672742 20d37d28 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2025/09/03 14:50 linux-6.1.y f89b6e15694c 96a211bc .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/30 06:01 linux-6.1.y 79807e970724 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/29 23:31 linux-6.1.y 79807e970724 b498adee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/29 16:14 linux-6.1.y 79807e970724 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/29 11:48 linux-6.1.y 79807e970724 b1d00f76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/29 01:27 linux-6.1.y 79807e970724 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/28 19:45 linux-6.1.y 79807e970724 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/28 09:25 linux-6.1.y 79807e970724 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/28 08:15 linux-6.1.y 79807e970724 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/28 02:13 linux-6.1.y 79807e970724 96923c60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/27 15:54 linux-6.1.y 79807e970724 168cb7a2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/25 20:01 linux-6.1.y 79807e970724 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/25 18:51 linux-6.1.y 79807e970724 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/25 08:26 linux-6.1.y 79807e970724 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/24 19:27 linux-6.1.y 79807e970724 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/23 18:37 linux-6.1.y 79807e970724 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/23 16:51 linux-6.1.y 79807e970724 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/23 15:49 linux-6.1.y 79807e970724 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/23 10:31 linux-6.1.y 79807e970724 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/22 03:01 linux-6.1.y 79807e970724 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/22 01:49 linux-6.1.y 79807e970724 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/21 03:49 linux-6.1.y 79807e970724 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/19 21:14 linux-6.1.y 79807e970724 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/19 10:52 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/19 08:33 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/19 05:39 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/18 15:46 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/18 08:13 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/17 13:41 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/17 05:59 linux-6.1.y 79807e970724 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/16 21:35 linux-6.1.y 79807e970724 4c840a2f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/16 10:28 linux-6.1.y 79807e970724 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/16 02:36 linux-6.1.y 79807e970724 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/15 08:39 linux-6.1.y a500ba24937a 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/13 03:02 linux-6.1.y a500ba24937a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/12 23:42 linux-6.1.y a500ba24937a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/12 14:25 linux-6.1.y a500ba24937a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/11 00:04 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/10 07:16 linux-6.1.y a500ba24937a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/09 14:56 linux-6.1.y a500ba24937a b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/09 11:34 linux-6.1.y a500ba24937a b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/09 08:14 linux-6.1.y a500ba24937a b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/10/08 14:59 linux-6.1.y a500ba24937a 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2025/05/02 02:01 linux-6.1.y 535ec20c5027 51b137cd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in sys_bpf
2024/04/20 10:26 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in sys_bpf
2026/05/24 22:07 linux-6.1.y dcbcab9d7079 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: rcu detected stall in sys_bpf
* Struck through repros no longer work on HEAD.