From: syzbot ci <syzbot+cid6b2cf8227adc21a@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, ast@kernel.org,
cgroups@vger.kernel.org, gehao@kylinos.cn, hannes@cmpxchg.org,
hao.ge@linux.dev, harry.yoo@oracle.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mhocko@kernel.org, muchun.song@linux.dev,
roman.gushchin@linux.dev, shakeel.butt@linux.dev,
surenb@google.com, vbabka@suse.cz
Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot ci] Re: slab: Introduce __SECOND_OBJEXT_FLAG for objext_flags
Date: Tue, 14 Oct 2025 06:10:56 -0700 [thread overview]
Message-ID: <68ee4be0.050a0220.ac43.0104.GAE@google.com> (raw)
In-Reply-To: <20251014093124.300012-1-hao.ge@linux.dev>
syzbot ci has tested the following series
[v1] slab: Introduce __SECOND_OBJEXT_FLAG for objext_flags
https://lore.kernel.org/all/20251014093124.300012-1-hao.ge@linux.dev
* [PATCH] slab: Introduce __SECOND_OBJEXT_FLAG for objext_flags
and found the following issue:
general protection fault in percpu_ref_get_many
Full report is available here:
https://ci.syzbot.org/series/6fd66120-211f-479f-b6a1-35f990da2dc2
***
general protection fault in percpu_ref_get_many
tree: torvalds
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base: 0d97f2067c166eb495771fede9f7b73999c67f66
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/74de5bb7-695b-4115-9a4b-ee7d7fd0cca2/config
Oops: general protection fault, probably for non-canonical address 0xdffffc00177780ff: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000bbbc07f8-0x00000000bbbc07ff]
CPU: 1 UID: 0 PID: 6155 Comm: syz-executor 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:percpu_ref_get_many+0x8d/0x140
Code: 01 48 c7 c7 80 70 78 8b be 65 03 00 00 48 c7 c2 c0 70 78 8b e8 64 2b 6f ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 c4 50 f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90004df7500 EFLAGS: 00010206
RAX: 00000000177780ff RBX: ffffffff822de139 RCX: 14bab840e71f4400
RDX: 0000000000000000 RSI: ffffffff8bc074c0 RDI: ffffffff8bc07480
RBP: 0000000000000088 R08: 0000000000000000 R09: ffffffff822de139
R10: dffffc0000000000 R11: fffffbfff1f3c1ef R12: dffffc0000000000
R13: ffff88823c63b5c0 R14: 0000000000000001 R15: 00000000bbbc07f8
FS: 0000555570ae6500(0000) GS:ffff8882a9d12000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555562d8c5c8 CR3: 0000000113444000 CR4: 00000000000006f0
Call Trace:
<TASK>
refill_obj_stock+0x254/0x850
__memcg_slab_free_hook+0x123/0x3b0
kfree+0x3f7/0x6d0
kobject_uevent_env+0x361/0x8c0
netdev_queue_update_kobjects+0x346/0x6c0
netdev_register_kobject+0x258/0x310
register_netdevice+0x126c/0x1ae0
__ip_tunnel_create+0x3e7/0x560
ip_tunnel_init_net+0x2ba/0x800
ops_init+0x35c/0x5c0
setup_net+0xfe/0x320
copy_net_ns+0x34e/0x4e0
create_new_namespaces+0x3f3/0x720
unshare_nsproxy_namespaces+0x11c/0x170
ksys_unshare+0x4c8/0x8c0
__x64_sys_unshare+0x38/0x50
do_syscall_64+0xfa/0xfa0
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f85c81906c7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe57c0ca58 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f85c81906c7
RDX: 00007f85c818eec9 RSI: 00007ffe57c0ca20 RDI: 0000000040000000
RBP: 00007ffe57c0cac0 R08: 00007f85c83a69d0 R09: 00007f85c83a69d0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe57c0cac0
R13: 00007ffe57c0cac8 R14: 0000000000000009 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:percpu_ref_get_many+0x8d/0x140
Code: 01 48 c7 c7 80 70 78 8b be 65 03 00 00 48 c7 c2 c0 70 78 8b e8 64 2b 6f ff 49 bc 00 00 00 00 00 fc ff df 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 c4 50 f7 ff 49 8b 07 a8 03 75 62
RSP: 0018:ffffc90004df7500 EFLAGS: 00010206
RAX: 00000000177780ff RBX: ffffffff822de139 RCX: 14bab840e71f4400
RDX: 0000000000000000 RSI: ffffffff8bc074c0 RDI: ffffffff8bc07480
RBP: 0000000000000088 R08: 0000000000000000 R09: ffffffff822de139
R10: dffffc0000000000 R11: fffffbfff1f3c1ef R12: dffffc0000000000
R13: ffff88823c63b5c0 R14: 0000000000000001 R15: 00000000bbbc07f8
FS: 0000555570ae6500(0000) GS:ffff8882a9d12000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555562d8c5c8 CR3: 0000000113444000 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.
prev parent reply other threads:[~2025-10-14 13:10 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-14 9:31 [PATCH] slab: Introduce __SECOND_OBJEXT_FLAG for objext_flags Hao Ge
2025-10-14 10:27 ` Harry Yoo
2025-10-14 11:18 ` Hao Ge
2025-10-14 12:49 ` Vlastimil Babka
2025-10-14 13:18 ` Hao Ge
2025-10-14 13:10 ` syzbot ci [this message]
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