* [moderation/CI] Re: mm/slub: Removing unnecessary variable accesses in the get_freelist()
@ 2025-09-10 2:21 syzbot ci
2025-09-10 8:37 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2025-09-10 2:21 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v1] mm/slub: Removing unnecessary variable accesses in the get_freelist()
https://lore.kernel.org/all/20250910005957.54108-1-rgbi3307@gmail.com
* [PATCH] mm/slub: Removing unnecessary variable accesses in the get_freelist()
and found the following issue:
kernel BUG in __smpboot_create_thread
Full report is available here:
https://ci.syzbot.org/series/832d6128-4556-4bd1-ab18-0676b8e7dbc1
***
kernel BUG in __smpboot_create_thread
tree: torvalds
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base: f777d1112ee597d7f7dd3ca232220873a34ad0c8
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/7bff7792-4edd-4680-a5e7-3cc9d97ac5ed/config
smpboot: CPU0: Intel QEMU Virtual CPU version 2.5+ (family: 0xf, model: 0x6b, stepping: 0x1)
Performance Events: unsupported Netburst CPU model 107 no PMU driver, software events only.
signal: max sigframe size: 1440
------------[ cut here ]------------
kernel BUG at mm/slub.c:3832!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:___slab_alloc+0x13ab/0x1420
Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f
RSP: 0000:ffffc90000047750 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001
RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55
R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480
R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55
FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
<TASK>
__kmalloc_cache_node_noprof+0x29a/0x3d0
__smpboot_create_thread+0x11a/0x3b0
smpboot_register_percpu_thread+0xc6/0x420
spawn_ksoftirqd+0x2f/0xc0
do_one_initcall+0x236/0x820
do_pre_smp_initcalls+0x4c/0x80
kernel_init_freeable+0x30c/0x4b0
kernel_init+0x1d/0x1d0
ret_from_fork+0x3fc/0x770
ret_from_fork_asm+0x1a/0x30
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:___slab_alloc+0x13ab/0x1420
Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f
RSP: 0000:ffffc90000047750 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001
RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55
R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480
R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55
FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
The email will later be sent to:
[42.hyeyoo@gmail.com akpm@linux-foundation.org cl@linux.com iamjoonsoo.kim@lge.com linux-kernel@vger.kernel.org linux-mm@kvack.org penberg@kernel.org rgbi3307@gmail.com rgbi3307@naver.com rientjes@google.com roman.gushchin@linux.dev vbabka@suse.cz]
If the report looks fine to you, reply with:
#syz upstream
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: mm/slub: Removing unnecessary variable accesses in the get_freelist()
2025-09-10 2:21 [moderation/CI] Re: mm/slub: Removing unnecessary variable accesses in the get_freelist() syzbot ci
@ 2025-09-10 8:37 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2025-09-10 8:37 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Wed, Sep 10, 2025 at 4:21 AM syzbot ci
<syzbot+ci5ba01a2db6fa3664@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v1] mm/slub: Removing unnecessary variable accesses in the get_freelist()
> https://lore.kernel.org/all/20250910005957.54108-1-rgbi3307@gmail.com
> * [PATCH] mm/slub: Removing unnecessary variable accesses in the get_freelist()
>
> and found the following issue:
> kernel BUG in __smpboot_create_thread
>
> Full report is available here:
> https://ci.syzbot.org/series/832d6128-4556-4bd1-ab18-0676b8e7dbc1
>
> ***
>
> kernel BUG in __smpboot_create_thread
>
> tree: torvalds
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base: f777d1112ee597d7f7dd3ca232220873a34ad0c8
> arch: amd64
> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> config: https://ci.syzbot.org/builds/7bff7792-4edd-4680-a5e7-3cc9d97ac5ed/config
>
> smpboot: CPU0: Intel QEMU Virtual CPU version 2.5+ (family: 0xf, model: 0x6b, stepping: 0x1)
> Performance Events: unsupported Netburst CPU model 107 no PMU driver, software events only.
> signal: max sigframe size: 1440
> ------------[ cut here ]------------
> kernel BUG at mm/slub.c:3832!
> Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
> CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:___slab_alloc+0x13ab/0x1420
> Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f
> RSP: 0000:ffffc90000047750 EFLAGS: 00010046
> RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001
> RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980
> RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55
> R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480
> R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55
> FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> __kmalloc_cache_node_noprof+0x29a/0x3d0
> __smpboot_create_thread+0x11a/0x3b0
> smpboot_register_percpu_thread+0xc6/0x420
> spawn_ksoftirqd+0x2f/0xc0
> do_one_initcall+0x236/0x820
> do_pre_smp_initcalls+0x4c/0x80
> kernel_init_freeable+0x30c/0x4b0
> kernel_init+0x1d/0x1d0
> ret_from_fork+0x3fc/0x770
> ret_from_fork_asm+0x1a/0x30
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:___slab_alloc+0x13ab/0x1420
> Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f
> RSP: 0000:ffffc90000047750 EFLAGS: 00010046
> RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001
> RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980
> RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55
> R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480
> R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55
> FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> The email will later be sent to:
> [42.hyeyoo@gmail.com akpm@linux-foundation.org cl@linux.com iamjoonsoo.kim@lge.com linux-kernel@vger.kernel.org linux-mm@kvack.org penberg@kernel.org rgbi3307@gmail.com rgbi3307@naver.com rientjes@google.com roman.gushchin@linux.dev vbabka@suse.cz]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> --
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2025-09-10 2:21 [moderation/CI] Re: mm/slub: Removing unnecessary variable accesses in the get_freelist() syzbot ci
2025-09-10 8:37 ` Aleksandr Nogikh
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