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e9e14a558f8ab-42f873d62c7mr267953315ab.18.1760447456621; Tue, 14 Oct 2025 06:10:56 -0700 (PDT) Date: Tue, 14 Oct 2025 06:10:56 -0700 In-Reply-To: <20251014093124.300012-1-hao.ge@linux.dev> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68ee4be0.050a0220.ac43.0104.GAE@google.com> Subject: [syzbot ci] Re: slab: Introduce __SECOND_OBJEXT_FLAG for objext_flags From: syzbot ci 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 Content-Type: text/plain; charset="UTF-8" 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: 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 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.