* [moderation/CI] Re: mm: switch deferred split shrinker to list_lru
@ 2026-03-12 6:57 syzbot ci
2026-03-12 9:11 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-03-12 6:57 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v1] mm: switch deferred split shrinker to list_lru
https://lore.kernel.org/all/20260311154358.150977-1-hannes@cmpxchg.org
* [PATCH] mm: switch deferred split shrinker to list_lru
and found the following issue:
WARNING in folio_memcg
Full report is available here:
https://ci.syzbot.org/series/3cf5ecdb-21ef-4894-a22d-6eb1eb437395
***
WARNING in folio_memcg
tree: mm-new
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base: f543926f9d0c3f6dfb354adfe7fbaeedd1277c6b
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/6c96ae71-4f8b-4153-8306-440a79f2b2e8/config
C repro: https://ci.syzbot.org/findings/25285d24-81d9-42b6-b715-1749d43db688/c_repro
syz repro: https://ci.syzbot.org/findings/25285d24-81d9-42b6-b715-1749d43db688/syz_repro
------------[ cut here ]------------
debug_locks && !(rcu_read_lock_held() || lock_is_held(&(&cgroup_mutex)->dep_map))
WARNING: ./include/linux/memcontrol.h:376 at obj_cgroup_memcg include/linux/memcontrol.h:376 [inline], CPU#1: syz.0.17/5956
WARNING: ./include/linux/memcontrol.h:376 at folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:430, CPU#1: syz.0.17/5956
Modules linked in:
CPU: 1 UID: 0 PID: 5956 Comm: syz.0.17 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:obj_cgroup_memcg include/linux/memcontrol.h:376 [inline]
RIP: 0010:folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:430
Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 8f 59 fb ff 48 8b 03 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 b9 39 92 ff 90 <0f> 0b 90 eb ca 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff ff
RSP: 0018:ffffc90005d86b98 EFLAGS: 00010093
RAX: ffffffff823359c7 RBX: ffff8881749d1080 RCX: ffff88817250d7c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffea00068f8007 R09: 1ffffd4000d1f000
R10: dffffc0000000000 R11: fffff94000d1f001 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffea00068f8000 R15: ffffea00068f8030
FS: 0000555584c04500(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e563fff CR3: 0000000175ed0000 CR4: 00000000000006f0
Call Trace:
<TASK>
__folio_freeze_and_split_unmapped+0x1db/0x31f0 mm/huge_memory.c:3766
__folio_split+0xa99/0x1570 mm/huge_memory.c:4029
madvise_cold_or_pageout_pte_range+0xe3b/0x2220 mm/madvise.c:501
walk_pmd_range mm/pagewalk.c:129 [inline]
walk_pud_range mm/pagewalk.c:223 [inline]
walk_p4d_range mm/pagewalk.c:261 [inline]
walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:302
__walk_page_range+0x14c/0x710 mm/pagewalk.c:410
walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:714
madvise_pageout_page_range mm/madvise.c:620 [inline]
madvise_pageout mm/madvise.c:645 [inline]
madvise_vma_behavior+0x2883/0x44d0 mm/madvise.c:1356
madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1711
madvise_do_behavior+0x386/0x540 mm/madvise.c:1927
do_madvise+0x1fa/0x2e0 mm/madvise.c:2020
__do_sys_madvise mm/madvise.c:2029 [inline]
__se_sys_madvise mm/madvise.c:2027 [inline]
__x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2027
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb99159c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc93688748 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007fb991815fa0 RCX: 00007fb99159c799
RDX: 0000000000000015 RSI: 0000000000002000 RDI: 0000200000f0f000
RBP: 00007fb991632bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb991815fac R14: 00007fb991815fa0 R15: 00007fb991815fa0
</TASK>
***
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:
[akpm@linux-foundation.org david@fromorbit.com david@redhat.com hannes@cmpxchg.org kas@kernel.org liam.howlett@oracle.com linux-kernel@vger.kernel.org linux-mm@kvack.org roman.gushchin@linux.dev usama.arif@linux.dev ziy@nvidia.com]
If the report looks fine to you, reply with:
#syz upstream
If the report is a false positive, reply with
#syz invalid
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: mm: switch deferred split shrinker to list_lru
2026-03-12 6:57 [moderation/CI] Re: mm: switch deferred split shrinker to list_lru syzbot ci
@ 2026-03-12 9:11 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2026-03-12 9:11 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Thu, Mar 12, 2026 at 7:57 AM syzbot ci
<syzbot+ci6d4f8c81af5ed43e@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v1] mm: switch deferred split shrinker to list_lru
> https://lore.kernel.org/all/20260311154358.150977-1-hannes@cmpxchg.org
> * [PATCH] mm: switch deferred split shrinker to list_lru
>
> and found the following issue:
> WARNING in folio_memcg
>
> Full report is available here:
> https://ci.syzbot.org/series/3cf5ecdb-21ef-4894-a22d-6eb1eb437395
>
> ***
>
> WARNING in folio_memcg
>
> tree: mm-new
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
> base: f543926f9d0c3f6dfb354adfe7fbaeedd1277c6b
> arch: amd64
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/6c96ae71-4f8b-4153-8306-440a79f2b2e8/config
> C repro: https://ci.syzbot.org/findings/25285d24-81d9-42b6-b715-1749d43db688/c_repro
> syz repro: https://ci.syzbot.org/findings/25285d24-81d9-42b6-b715-1749d43db688/syz_repro
>
> ------------[ cut here ]------------
> debug_locks && !(rcu_read_lock_held() || lock_is_held(&(&cgroup_mutex)->dep_map))
> WARNING: ./include/linux/memcontrol.h:376 at obj_cgroup_memcg include/linux/memcontrol.h:376 [inline], CPU#1: syz.0.17/5956
> WARNING: ./include/linux/memcontrol.h:376 at folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:430, CPU#1: syz.0.17/5956
> Modules linked in:
> CPU: 1 UID: 0 PID: 5956 Comm: syz.0.17 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:obj_cgroup_memcg include/linux/memcontrol.h:376 [inline]
> RIP: 0010:folio_memcg+0x148/0x1c0 include/linux/memcontrol.h:430
> Code: 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 8f 59 fb ff 48 8b 03 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc e8 b9 39 92 ff 90 <0f> 0b 90 eb ca 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ef fe ff ff
> RSP: 0018:ffffc90005d86b98 EFLAGS: 00010093
> RAX: ffffffff823359c7 RBX: ffff8881749d1080 RCX: ffff88817250d7c0
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: ffffea00068f8007 R09: 1ffffd4000d1f000
> R10: dffffc0000000000 R11: fffff94000d1f001 R12: dffffc0000000000
> R13: dffffc0000000000 R14: ffffea00068f8000 R15: ffffea00068f8030
> FS: 0000555584c04500(0000) GS:ffff8882a9466000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2e563fff CR3: 0000000175ed0000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> __folio_freeze_and_split_unmapped+0x1db/0x31f0 mm/huge_memory.c:3766
> __folio_split+0xa99/0x1570 mm/huge_memory.c:4029
> madvise_cold_or_pageout_pte_range+0xe3b/0x2220 mm/madvise.c:501
> walk_pmd_range mm/pagewalk.c:129 [inline]
> walk_pud_range mm/pagewalk.c:223 [inline]
> walk_p4d_range mm/pagewalk.c:261 [inline]
> walk_pgd_range+0x1032/0x1d30 mm/pagewalk.c:302
> __walk_page_range+0x14c/0x710 mm/pagewalk.c:410
> walk_page_range_vma_unsafe+0x309/0x410 mm/pagewalk.c:714
> madvise_pageout_page_range mm/madvise.c:620 [inline]
> madvise_pageout mm/madvise.c:645 [inline]
> madvise_vma_behavior+0x2883/0x44d0 mm/madvise.c:1356
> madvise_walk_vmas+0x573/0xae0 mm/madvise.c:1711
> madvise_do_behavior+0x386/0x540 mm/madvise.c:1927
> do_madvise+0x1fa/0x2e0 mm/madvise.c:2020
> __do_sys_madvise mm/madvise.c:2029 [inline]
> __se_sys_madvise mm/madvise.c:2027 [inline]
> __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2027
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fb99159c799
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffc93688748 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
> RAX: ffffffffffffffda RBX: 00007fb991815fa0 RCX: 00007fb99159c799
> RDX: 0000000000000015 RSI: 0000000000002000 RDI: 0000200000f0f000
> RBP: 00007fb991632bd9 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007fb991815fac R14: 00007fb991815fa0 R15: 00007fb991815fa0
> </TASK>
>
>
> ***
>
> 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:
> [akpm@linux-foundation.org david@fromorbit.com david@redhat.com hannes@cmpxchg.org kas@kernel.org liam.howlett@oracle.com linux-kernel@vger.kernel.org linux-mm@kvack.org roman.gushchin@linux.dev usama.arif@linux.dev ziy@nvidia.com]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
> #syz invalid
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-upstream-moderation" group.
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2026-03-12 6:57 [moderation/CI] Re: mm: switch deferred split shrinker to list_lru syzbot ci
2026-03-12 9:11 ` Aleksandr Nogikh
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