INFO: rcu detected stall in batadv_bla_periodic_work (2)

Status: upstream: reported syz repro on 2024/09/17 15:14
Subsystems: batman
[Documentation on labels]
Reported-by: syzbot+fc38cf2d6e727d8415c7@syzkaller.appspotmail.com
First crash: 682d, last: 89d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (6)
ID Workflow Result Correct Bug Created Started Finished Revision Error
89ecebb5 assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/07/09 01:01 2026/07/09 01:01 2026/07/09 01:28 93f57954 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
351dba68 assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/06/22 02:33 2026/06/22 02:33 2026/06/22 02:56 43bfcdb0 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
ad536fba assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/06/14 02:12 2026/06/14 02:12 2026/06/14 02:43 4f06757f 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
4667d63a assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/06/09 18:06 2026/06/09 18:06 2026/06/09 18:32 c36c07f6 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
0bd3a892 assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/06/02 15:09 2026/06/02 15:09 2026/06/02 15:41 62fe1528 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
64fb639b assessment-security 💥 INFO: rcu detected stall in batadv_bla_periodic_work (2) 2026/05/25 10:57 2026/05/25 10:57 2026/05/25 11:16 c69befb3 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cd78e91d73c6399e83...
truncated to first 200 bytes; open job for full error
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly batman report (Dec 2025) 0 (1) 2025/12/22 13:07
[syzbot] Monthly batman report (Mar 2025) 0 (1) 2025/03/03 10:39
[syzbot] [batman?] INFO: rcu detected stall in batadv_bla_periodic_work (2) 0 (1) 2024/09/17 15:14
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in batadv_bla_periodic_work 1 1 627d 627d 0/3 auto-obsoleted due to no activity on 2025/02/16 00:06
upstream INFO: rcu detected stall in batadv_bla_periodic_work net 1 1 990d 990d 0/29 auto-obsoleted due to no activity on 2024/02/09 07:47
linux-6.1 INFO: rcu detected stall in batadv_bla_periodic_work (2) 1 2 396d 423d 0/3 auto-obsoleted due to no activity on 2025/10/05 07:27
linux-5.15 INFO: rcu detected stall in batadv_bla_periodic_work 1 1 643d 643d 0/3 auto-obsoleted due to no activity on 2025/01/30 13:51
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/06/21 13:16 38m retest repro upstream log
2026/06/06 02:17 3h54m retest repro linux-next error
2026/04/12 06:12 32m retest repro upstream report log
2026/04/12 06:05 26m retest repro upstream report log
2026/03/27 08:29 18m retest repro linux-next report log
2026/01/16 04:21 1h02m retest repro linux-next report log
2025/11/20 08:26 22m retest repro upstream report log
2025/09/11 00:53 19m retest repro upstream report log
2024/12/23 20:13 23m retest repro upstream report log
2024/09/27 15:35 19m retest repro upstream report log
▶ ▼ Fix bisection attempts (8)
Created Duration User Patch Repo Result
2026/02/01 04:36 12m bisect fix upstream error job log
2025/12/21 17:51 2h21m bisect fix upstream OK (0) job log log
2025/07/02 22:12 2h15m bisect fix upstream OK (0) job log log
2025/05/20 13:05 3h19m bisect fix upstream OK (0) job log log
2025/03/31 21:06 4h41m bisect fix upstream OK (0) job log log
2025/03/01 19:00 2h04m bisect fix upstream OK (0) job log log
2025/01/30 10:14 6h19m bisect fix upstream OK (0) job log log
2024/10/14 17:48 2h15m bisect fix upstream OK (0) job log log

Sample crash report:
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2684 jiffies s: 3397 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 UID: 0 PID: 29 Comm: kworker/u8:2 Not tainted 6.11.0-rc7-syzkaller-00097-g196145c606d0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:kasan_check_range+0x14f/0x1a0 mm/kasan/generic.c:190
Code: 83 c0 01 49 89 d3 48 39 d0 74 11 80 38 00 74 ef 4d 8d 1c 2c 48 85 c0 48 89 c2 75 93 48 89 da 4c 89 d8 4c 29 da e9 2c ff ff ff <5b> b8 01 00 00 00 5d 41 5c c3 cc cc cc cc b8 01 00 00 00 c3 cc cc
RSP: 0018:ffffc90000007a68 EFLAGS: 00000046
RAX: fffffbfff2d248e1 RBX: fffffbfff2d248e1 RCX: ffffffff8168d93e
RDX: fffffbfff2d248e1 RSI: 0000000000000008 RDI: ffffffff96924700
RBP: fffffbfff2d248e0 R08: 0000000000000000 R09: fffffbfff2d248e0
R10: ffffffff96924707 R11: 0000000000000000 R12: 0000000000000002
R13: ffff88801d698b58 R14: 0000000000000001 R15: ffff88801d698000
FS:  0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557158cde858 CR3: 000000000db7c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 hlock_class+0x4e/0x130 kernel/locking/lockdep.c:227
 check_wait_context kernel/locking/lockdep.c:4772 [inline]
 __lock_acquire+0x415/0x3cb0 kernel/locking/lockdep.c:5092
 lock_acquire kernel/locking/lockdep.c:5759 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_activate+0x199/0x540 lib/debugobjects.c:709
 debug_hrtimer_activate kernel/time/hrtimer.c:423 [inline]
 debug_activate kernel/time/hrtimer.c:478 [inline]
 enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1085
 __run_hrtimer kernel/time/hrtimer.c:1706 [inline]
 __hrtimer_run_queues+0xaac/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x111/0x1a0 mm/kasan/generic.c:189
Code: 44 89 c2 e8 a1 ea ff ff 83 f0 01 5b 5d 41 5c c3 cc cc cc cc 48 85 d2 74 4f 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 41 80 38 00 <74> f2 eb b2 41 bc 08 00 00 00 45 29 dc 49 8d 14 2c eb 0c 48 83 c0
RSP: 0018:ffffc90000a57a58 EFLAGS: 00000246
RAX: fffffbfff20289b3 RBX: fffffbfff20289b4 RCX: ffffffff8169d04b
RDX: fffffbfff20289b4 RSI: 0000000000000008 RDI: ffffffff90144d98
RBP: fffffbfff20289b3 R08: 0000000000000000 R09: fffffbfff20289b3
R10: ffffffff90144d9f R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8ddb9fe0 R15: 0000000000000000
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:562 [inline]
 cpu_online include/linux/cpumask.h:1105 [inline]
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0xbb/0x560 kernel/locking/lockdep.c:5730
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 batadv_bla_purge_claims+0x160/0x780 net/batman-adv/bridge_loop_avoidance.c:1289
 batadv_bla_periodic_work+0x51/0x9e0 net/batman-adv/bridge_loop_avoidance.c:1444
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/13 15:05 upstream 196145c606d0 73e8a465 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in batadv_bla_periodic_work
2026/01/02 03:34 linux-next cc3aa43b44bd d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in batadv_bla_periodic_work
2026/04/30 09:43 linux-next 0787c45ea08a 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in batadv_bla_periodic_work
2025/11/21 16:58 linux-next d724c6f85e80 c31c1b0b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in batadv_bla_periodic_work
* Struck through repros no longer work on HEAD.