syzbot

 sign-in | mailing list | source | docs
🐞 Open [303]
🐞 Fixed [1]
🐞 Invalid [0]
⬇ Missing Backports [9]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

INFO: rcu detected stall in corrupted

Status: upstream: reported C repro on 2025/06/23 09:19
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+3933334836e4dc9a4f6e@syzkaller.appspotmail.com
First crash: 62d, last: 4d00h
Fix commit to backport (bisect log) :
tree: upstream
commit 5f6bd380c7bdbe10f7b4e8ddcceed60ce0714c6d
Author: Peter Zijlstra <peterz@infradead.org>
Date: Mon May 27 12:06:55 2024 +0000

  sched/rt: Remove default bandwidth control

  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/06/30 linux-6.6.y (ToT) 3f5b4c104b7d C [report] INFO: rcu detected stall in corrupted
2025/06/30 upstream (ToT) d0b3b7b22dfa C Didn't crash
▶ ▼ Similar bugs (21)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: rcu detected stall in corrupted origin:upstream missing-backport 1 C inconclusive 3932 2d09h 895d 0/3 upstream: reported C repro on 2023/03/13 04:03
android-414 INFO: rcu detected stall in corrupted 1 C 3 2255d 2328d 0/1 public: reported C repro on 2019/04/10 16:04
android-49 INFO: rcu detected stall in corrupted 1 C 27 2140d 2325d 0/3 public: reported C repro on 2019/04/14 00:00
upstream INFO: rcu detected stall in corrupted (3) kernel 1 C done 1 2344d 2340d 0/29 closed as invalid on 2019/03/30 00:13
linux-4.14 INFO: rcu detected stall in corrupted (2) 1 C error 4 1898d 2059d 0/1 upstream: reported C repro on 2020/01/04 08:54
upstream INFO: rcu detected stall in corrupted (4) tipc 1 C done inconclusive 676 2d07h 1815d 0/29 upstream: reported C repro on 2020/09/04 18:49
upstream INFO: rcu detected stall in corrupted net 1 syz 1 2652d 2652d 8/29 fixed on 2018/07/09 18:05
linux-4.14 INFO: rcu detected stall in corrupted 1 C done 3 2172d 2194d 1/1 fixed on 2019/12/05 23:59
linux-4.19 INFO: rcu detected stall in corrupted 1 C error 2 1312d 2019d 0/1 upstream: reported C repro on 2020/02/13 05:06
upstream INFO: rcu detected stall in corrupted (2) kernel 1 syz 1 2584d 2584d 0/29 closed as invalid on 2018/07/29 11:55
linux-5.15 INFO: rcu detected stall in corrupted origin:lts-only 1 C error 40 6h15m 671d 0/3 upstream: reported C repro on 2023/10/23 02:41
upstream INFO: task hung in exit_aio (4) fs 1 6 254d 320d 0/29 auto-obsoleted due to no activity on 2025/03/13 05:51
android-5-15 BUG: soft lockup in corrupted origin:upstream 1 C error 33 344d 500d 0/2 upstream: reported C repro on 2024/04/11 09:01
upstream BUG: workqueue lockup (5) net 1 C done 13170 24m 2049d 0/29 upstream: reported C repro on 2020/01/14 22:04
upstream INFO: task hung in nsim_destroy (4) net 1 429 30d 450d 0/29 upstream: reported on 2024/05/31 11:16
upstream INFO: task hung in reg_process_self_managed_hints wireless 1 C done 835 4d06h 734d 0/29 upstream: reported C repro on 2023/08/21 16:36
linux-4.14 BUG: soft lockup in corrupted 1 C error 12 1120d 1603d 0/1 upstream: reported C repro on 2021/04/04 06:30
upstream INFO: task hung in reg_check_chans_work (7) wireless 1 C error 678 4h39m 335d 0/29 upstream: reported C repro on 2024/09/23 08:39
upstream INFO: task hung in linkwatch_event (4) net 1 C done 3285 2h53m 393d 0/29 upstream: reported C repro on 2024/07/27 06:21
upstream INFO: task hung in uevent_show (2) kernel 1 C inconclusive 8325 50d 288d 29/29 fixed on 2025/07/17 21:22
linux-4.19 BUG: soft lockup in corrupted 1 C error 3 1149d 1337d 0/1 upstream: reported C repro on 2021/12/26 20:46
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/07/15 19:07 7h37m fix candidate upstream OK (1) job log

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=7244/1/0x4000000000000000 softirq=10500/2332952 fqs=5227
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1185608    1173067            0
rcu: 	cputime:     1082      50269         1101   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=10101 q=424 ncpus=2)
CPU: 0 PID: 5904 Comm: syz-executor255 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_switch+0x96/0x120 kernel/kcov.c:350
Code: 41 54 53 48 8b 54 24 20 65 4c 8b 05 a4 29 7e 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 92 29 7e 7e <41> 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 00 00 75 d9 41 83 b8 1c
RSP: 0018:ffffc90000007428 EFLAGS: 00000202
RAX: 0000000000000020 RBX: 0000000000000004 RCX: 0000000000000005
RDX: ffffffff818755b5 RSI: ffffffff8cd79180 RDI: 0000000000000004
RBP: 0000000000000c80 R08: ffff88802fd68000 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000105 R12: dffffc0000000000
R13: f800000000000000 R14: ffff888018241560 R15: 00000000000929c4
FS:  000055558dca4380(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7456dca130 CR3: 00000000262ee000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 rb_event_length+0x45/0x3f0 kernel/trace/ring_buffer.c:198
 check_buffer+0x542/0x950 kernel/trace/ring_buffer.c:3491
 __rb_reserve_next+0x511/0xd50 kernel/trace/ring_buffer.c:3624
 rb_reserve_next_event kernel/trace/ring_buffer.c:3759 [inline]
 ring_buffer_lock_reserve+0xae1/0xed0 kernel/trace/ring_buffer.c:3818
 __trace_buffer_lock_reserve kernel/trace/trace.c:992 [inline]
 trace_event_buffer_lock_reserve+0x1d0/0x6e0 kernel/trace/trace.c:2902
 trace_event_buffer_reserve+0x29b/0x3c0 kernel/trace/trace_events.c:661
 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline]
 trace_event_raw_event_bpf_trace_printk+0x101/0x210 kernel/trace/bpf_trace.h:11
 trace_bpf_trace_printk+0x142/0x1a0 kernel/trace/bpf_trace.h:11
 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline]
 bpf_trace_printk+0x11f/0x190 kernel/trace/bpf_trace.c:371
 bpf_prog_9e1c00255e17e72e+0x38/0x3a
 bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
 __bpf_prog_run include/linux/filter.h:612 [inline]
 bpf_prog_run include/linux/filter.h:619 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2322 [inline]
 bpf_trace_run1+0x1c9/0x3b0 kernel/trace/bpf_trace.c:2360
 __bpf_trace_rcu_utilization+0xa2/0xe0 include/trace/events/rcu.h:27
 __traceiter_rcu_utilization+0x70/0xa0 include/trace/events/rcu.h:27
 trace_rcu_utilization+0x179/0x1a0 include/trace/events/rcu.h:27
 rcu_core+0x12d/0x1720 kernel/rcu/tree.c:2439
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 00 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 aa 8f f0 f6 48 89 df e8 c2 61 f1 f6 e8 7d fd 14 f7 fb bf 01 00 00 00 <e8> 12 7a e4 f6 65 8b 05 33 c9 8c 75 85 c0 74 02 5b c3 e8 10 ab 89
RSP: 0018:ffffc900045c7bf0 EFLAGS: 00000286
RAX: 50eb0e8a542e6a00 RBX: ffff88802bf22500 RCX: 50eb0e8a542e6a00
RDX: dffffc0000000000 RSI: ffffffff8aaab9c0 RDI: 0000000000000001
RBP: ffffc900045c7d50 R08: ffffffff8e4a882f R09: 1ffffffff1c95105
R10: dffffc0000000000 R11: fffffbfff1c95106 R12: ffff888029a070b0
R13: ffff88802fd68790 R14: dffffc0000000000 R15: ffff88802fd68918
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 acct_collect+0x595/0x750 kernel/acct.c:624
 do_exit+0x816/0x23c0 kernel/exit.c:853
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7456d4df79
Code: 90 49 c7 c0 b8 ff ff ff be e7 00 00 00 ba 3c 00 00 00 eb 12 0f 1f 44 00 00 89 d0 0f 05 48 3d 00 f0 ff ff 77 1c f4 89 f0 0f 05 <48> 3d 00 f0 ff ff 76 e7 f7 d8 64 41 89 00 eb df 0f 1f 80 00 00 00
RSP: 002b:00007ffdafba19a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7456d4df79
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007f7456dc92b0 R08: ffffffffffffffb8 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7456dc92b0
R13: 0000000000000000 R14: 00007f7456dc9d20 R15: 00007f7456d1f130
 </TASK>

Crashes (44):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/21 01:38 linux-6.6.y bb9c90ab9c5a 0b9605c8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/17 10:46 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/16 08:46 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/16 03:25 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/12 10:04 linux-6.6.y 3a8ababb8b6a c06e8995 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/11 11:35 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/11 08:42 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/11 06:28 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/11 03:51 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/11 03:43 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/11 01:07 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/10 19:17 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/10 16:15 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/09 18:01 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/07 17:51 linux-6.6.y 3a8ababb8b6a 04cffc22 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/06 21:26 linux-6.6.y 3a8ababb8b6a ffe1dd46 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/04 04:29 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/03 14:37 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/08/03 13:22 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/03 02:35 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/02 19:19 linux-6.6.y 3a8ababb8b6a 7368264b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/01 02:02 linux-6.6.y dbcb8d8e4163 0c075d67 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/07/28 06:35 linux-6.6.y dbcb8d8e4163 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/07/25 22:21 linux-6.6.y dbcb8d8e4163 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/20 22:08 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/07/13 08:18 linux-6.6.y 59a2de10b81a 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: rcu detected stall in corrupted
2025/07/13 03:48 linux-6.6.y 59a2de10b81a 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/12 23:12 linux-6.6.y 59a2de10b81a 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/12 17:50 linux-6.6.y 59a2de10b81a 3cda49cf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/07 09:51 linux-6.6.y a5df3a702b2c 4f67c4ae .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/06/29 11:43 linux-6.6.y 3f5b4c104b7d fc9d8ee5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/06/29 08:07 linux-6.6.y 3f5b4c104b7d fc9d8ee5 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/18 23:46 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/18 16:21 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/17 11:36 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/08/17 04:46 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/27 20:54 linux-6.6.y dbcb8d8e4163 fb8f743d .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/21 08:18 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/21 03:00 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/20 14:50 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/20 07:41 linux-6.6.y d96eb99e2f0e 7117feec .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/07/11 18:38 linux-6.6.y 59a2de10b81a 3cda49cf .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/06/23 17:50 linux-6.6.y 6282921b6825 d6cdfb8a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
2025/06/23 09:19 linux-6.6.y 6282921b6825 d6cdfb8a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: rcu detected stall in corrupted
* Struck through repros no longer work on HEAD.