INFO: rcu detected stall in bpf_prog_release

Status: auto-obsoleted due to no activity on 2026/09/05 08:52
Subsystems: modules bpf
Labels: prio:normal
[Documentation on labels]
First crash: 125d, last: 102d
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
53f09161 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ INFO: rcu detected stall in bpf_prog_release 2026/06/01 16:15 2026/06/01 16:15 2026/06/01 17:16 386cc6da
Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in bpf_prog_release origin:lts-only 1 syz inconclusive 1 153d 153d 0/3 upstream: reported syz repro on 2026/04/18 01:45
android-5-15 BUG: soft lockup in bpf_prog_release (2) 1 1 247d 247d 0/2 auto-obsoleted due to no activity on 2026/04/14 03:11
android-5-15 BUG: soft lockup in bpf_prog_release 1 1 877d 877d 0/2 auto-obsoleted due to no activity on 2024/07/23 02:58
android-5-10 BUG: soft lockup in bpf_prog_release 1 1 290d 290d 0/2 auto-obsoleted due to no activity on 2026/03/01 16:12

Sample crash report:
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P11527/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=40085, q=1631 ncpus=2)
task:syz.4.1610      state:R  running task     stack:24408 pid:11527 tgid:11527 ppid:5627   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5388 [inline]
 __schedule+0x1821/0x5740 kernel/sched/core.c:7189
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x14f/0x760 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_release+0x2d7/0x3c0 kernel/locking/lockdep.c:5893
Code: bc 97 11 00 00 00 00 eb b5 e8 55 dc 06 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 45 77 97 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 62 35 92
RSP: 0018:ffffc9001c73f868 EFLAGS: 00000282
RAX: f27eae2f48bf9300 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e21a139 RDI: ffffffff8c28af60
RBP: ffff88807b138b90 R08: ffffffff81af618d R09: ffffffff8e95cda0
R10: ffffc9001c73f978 R11: ffffffff81b0efc0 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e95cda0 R15: ffff88807b138000
 rcu_lock_release include/linux/rcupdate.h:310 [inline]
 rcu_read_unlock include/linux/rcupdate.h:869 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
 is_module_text_address+0x18b/0x1e0 kernel/module/main.c:3923
 kernel_text_address+0x94/0xe0 kernel/extable.c:119
 __kernel_text_address+0xd/0x30 kernel/extable.c:79
 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3131 [inline]
 call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
 bpf_prog_release+0x38/0x50 kernel/bpf/syscall.c:2428
 __fput+0x44f/0xa60 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a5779ce59
RSP: 002b:00007ffc5ae579f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f3a57a17da0 RCX: 00007f3a5779ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3a57a17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f3a57a17cb0 R11: 0000000000000246 R12: 0000000000030f6c
R13: 00007f3a57a1636c R14: 0000000000030f39 R15: 00007f3a57a16360
 </TASK>
net_ratelimit: 14951 callbacks suppressed
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
net_ratelimit: 16451 callbacks suppressed
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/16 02:01 net 915fab69823a 81fb92f3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in bpf_prog_release
2026/06/07 08:46 net-next 903db046d557 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in bpf_prog_release
* Struck through repros no longer work on HEAD.