syzbot


BUG: soft lockup in smp_call_function

Status: upstream: reported C repro on 2023/03/18 00:36
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+404835f31926b466eadd@syzkaller.appspotmail.com
First crash: 946d, last: 3d20h
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2024/11/30 upstream (ToT) 2ba9f676d0a2 C [report] BUG: soft lockup in smp_call_function
Similar bugs (15)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 BUG: soft lockup in smp_call_function origin:upstream missing-backport 1 C inconclusive 290 2d11h 565d 0/2 upstream: reported C repro on 2024/04/02 06:05
linux-4.19 BUG: soft lockup in smp_call_function 1 C error 2 1146d 1275d 0/1 upstream: reported C repro on 2022/04/23 05:26
upstream BUG: soft lockup in smp_call_function kernel 1 C done 1615 2d00h 1924d 0/29 upstream: reported C repro on 2020/07/12 23:02
android-54 BUG: soft lockup in smp_call_function 1 1 1444d 1444d 0/2 auto-closed as invalid on 2022/03/05 18:04
android-6-12 BUG: soft lockup in smp_call_function 1 1 79d 79d 0/1 premoderation: reported on 2025/08/01 09:22
linux-4.14 BUG: soft lockup in smp_call_function 1 C 1 973d 1275d 0/1 upstream: reported C repro on 2022/04/23 04:43
linux-5.15 BUG: soft lockup in smp_call_function missing-backport origin:lts-only 1 C error 275 3d17h 945d 0/3 upstream: reported C repro on 2023/03/19 12:10
android-5-15 BUG: soft lockup in smp_call_function origin:upstream 1 C error inconclusive 954 22h02m 959d 0/2 upstream: reported C repro on 2023/03/05 21:20
android-54 BUG: soft lockup in smp_call_function (2) 1 C 41 173d 630d 0/2 upstream: reported C repro on 2024/01/28 03:58
android-5-10 BUG: soft lockup in smp_call_function 1 C error 136 10d 819d 0/2 upstream: reported C repro on 2023/07/22 22:59
upstream INFO: rcu detected stall in smp_call_function perf 1 C 107 1653d 1908d 20/29 fixed on 2021/04/13 06:26
linux-6.6 INFO: rcu detected stall in smp_call_function origin:lts-only 1 C 15 13d 70d 0/2 upstream: reported C repro on 2025/08/10 04:01
upstream INFO: rcu detected stall in smp_call_function_single kernel 1 4 2676d 2714d 0/29 closed as invalid on 2018/07/20 09:38
android-49 INFO: rcu detected stall in smp_call_function_single 1 1 2625d 2625d 0/3 auto-closed as invalid on 2019/02/22 15:22
upstream INFO: rcu detected stall in smp_call_function_single (2) kernel 1 3 2601d 2626d 0/29 closed as invalid on 2018/09/05 12:51

Sample crash report:
watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [kworker/u4:2:39]
Modules linked in:
irq event stamp: 841622
hardirqs last  enabled at (841621): [<ffff800011958d4c>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (841621): [<ffff800011958d4c>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (841622): [<ffff800011956d60>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (841622): [<ffff800011956d60>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (836758): [<ffff8000081a967c>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (836758): [<ffff8000081a967c>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624
softirqs last disabled at (836725): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:630
CPU: 0 PID: 39 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: events_unbound toggle_allocation_gate
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : csd_lock_wait kernel/smp.c:424 [inline]
pc : smp_call_function_many_cond+0x1384/0x1460 kernel/smp.c:998
lr : csd_lock_wait kernel/smp.c:424 [inline]
lr : smp_call_function_many_cond+0x139c/0x1460 kernel/smp.c:998
sp : ffff80001cd87830
x29: ffff80001cd87890 x28: 0000000000000001 x27: ffff8000150bd000
x26: 0000000000000011 x25: ffff8000150c1140 x24: ffff00019f6d11c0
x23: 1fffe00033eda238 x22: dfff800000000000 x21: ffff00019f6f6a08
x20: 0000000000000001 x19: ffff8000152b9f60 x18: ffff800011abbcc0
x17: 1fffe00033ed797e x16: ffff8000082d22d4 x15: 0000000000000000
x14: 0000000000000001 x13: 1ffff00002a180b1 x12: 0000000000ff0100
x11: ff008000083ffe78 x10: 0000000000000000 x9 : 0000000000000000
x8 : 0000000000000011 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff8000083ffe6c
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:252 [inline]
 __cmpwait arch/arm64/include/asm/cmpxchg.h:278 [inline]
 csd_lock_wait kernel/smp.c:424 [inline]
 smp_call_function_many_cond+0x1384/0x1460 kernel/smp.c:998
 smp_call_function_many kernel/smp.c:1022 [inline]
 smp_call_function kernel/smp.c:1044 [inline]
 kick_all_cpus_sync+0x40/0xa0 kernel/smp.c:1190
 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34
 __jump_label_update+0x30c/0x334 kernel/jump_label.c:518
 jump_label_update+0x304/0x3b4 kernel/jump_label.c:864
 static_key_enable_cpuslocked+0x11c/0x220 kernel/jump_label.c:207
 static_key_enable+0x24/0x38 kernel/jump_label.c:220
 toggle_allocation_gate+0xc0/0x3f8 mm/kfence/core.c:805
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Crashes (161):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/09 01:53 linux-6.1.y 28c695c365e1 d291dd2d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/28 05:48 linux-6.1.y 3594f306da12 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/28 00:21 linux-6.1.y 3594f306da12 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/27 22:01 linux-6.1.y 3594f306da12 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/27 17:00 linux-6.1.y 3594f306da12 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/27 09:03 linux-6.1.y 3594f306da12 fb8f743d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/30 11:42 linux-6.1.y 8e60a714ba3b d3999433 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/04 18:39 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/04 16:06 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/03 18:55 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/26 01:13 linux-6.1.y 3a8358583626 d34966d1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/15 21:40 linux-6.1.y 0cbb5f65e52f 40a34ec9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/05 18:45 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/29 15:28 linux-6.1.y e4d90d63d385 5df23865 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/09/19 04:01 linux-6.1.y 3db754f56897 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in smp_call_function
2025/04/18 19:17 linux-6.1.y 420102835862 2a20f901 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/04/07 02:25 linux-6.1.y 8e60a714ba3b 1c65791e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/03 15:16 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/26 12:41 linux-6.1.y 3a8358583626 d34966d1 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/26 06:07 linux-6.1.y 3a8358583626 d34966d1 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/05 12:32 linux-6.1.y 0cbb5f65e52f 5896748e .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/07 18:33 linux-6.1.y e4d90d63d385 9ac0fdc6 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/08 00:44 linux-6.1.y 7c15117f9468 867e44df .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/10/31 21:40 linux-6.1.y 7ec6f9fa3d97 96eb609f .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/03 22:17 linux-6.1.y 3a8358583626 c3901742 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in smp_call_function
2024/11/18 04:58 linux-6.1.y b67dc5c9ade9 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: soft lockup in smp_call_function
2025/10/16 01:28 linux-6.1.y c2fda4b3f577 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/10/16 00:54 linux-6.1.y c2fda4b3f577 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/10/13 19:14 linux-6.1.y 882efbdd9d34 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/10/09 05:04 linux-6.1.y 882efbdd9d34 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/10/08 04:21 linux-6.1.y 882efbdd9d34 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/10/03 05:57 linux-6.1.y 882efbdd9d34 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/09/22 21:42 linux-6.1.y 363a599da6d9 0ac7291c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/09/03 01:30 linux-6.1.y f89b6e15694c 96a211bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/08/02 12:58 linux-6.1.y 3594f306da12 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/08/02 07:48 linux-6.1.y 3594f306da12 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/07/04 09:07 linux-6.1.y 7e69c33e4858 76ad128c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/05/31 20:40 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/05/30 10:54 linux-6.1.y da3c5173c55f 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/05/24 09:57 linux-6.1.y da3c5173c55f ed351ea7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/05/23 10:08 linux-6.1.y da3c5173c55f fa44301a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/04/27 05:43 linux-6.1.y 535ec20c5027 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/04/18 14:14 linux-6.1.y 420102835862 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/04/17 17:51 linux-6.1.y 420102835862 229db4cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/04/05 09:35 linux-6.1.y 8e60a714ba3b c53ea9c9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/03/23 15:22 linux-6.1.y 344a09659766 4e8d3850 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/25 18:01 linux-6.1.y 3a8358583626 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/23 19:04 linux-6.1.y 3a8358583626 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/14 10:54 linux-6.1.y 0cbb5f65e52f d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/02/10 21:41 linux-6.1.y 0cbb5f65e52f 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/30 10:24 linux-6.1.y 75cefdf153f5 afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/25 06:57 linux-6.1.y 75cefdf153f5 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/24 17:03 linux-6.1.y 75cefdf153f5 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/23 20:16 linux-6.1.y 75cefdf153f5 521b0ce3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/22 01:34 linux-6.1.y f4f677285b38 da72ac06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/15 06:33 linux-6.1.y c63962be84ef 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/13 21:06 linux-6.1.y c63962be84ef 249ceea9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2025/01/06 08:30 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/17 15:09 linux-6.1.y 52f863f820fd f93b2b55 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/12 23:17 linux-6.1.y e4d90d63d385 530e80f8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/10 19:10 linux-6.1.y e4d90d63d385 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/09 15:18 linux-6.1.y e4d90d63d385 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/12/06 21:56 linux-6.1.y e4d90d63d385 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/30 03:44 linux-6.1.y e4d90d63d385 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/29 22:52 linux-6.1.y e4d90d63d385 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/28 05:23 linux-6.1.y e4d90d63d385 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2024/11/25 22:33 linux-6.1.y e4d90d63d385 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 BUG: soft lockup in smp_call_function
2023/03/18 00:36 linux-6.1.y 7eaef76fbc46 7939252e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan BUG: soft lockup in smp_call_function
2025/09/21 11:59 linux-6.1.y 363a599da6d9 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-perf INFO: rcu detected stall in smp_call_function
2024/11/26 04:45 linux-6.1.y e4d90d63d385 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: rcu detected stall in smp_call_function
* Struck through repros no longer work on HEAD.