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AJvYcCUYWbj1erblx3kJR3b1izCHuLQ/Wbde6t86V9GpjFsaToHmUoSd5+Ik0ThhY1ez15ldcKUTpDCUWgHPpf8=@vger.kernel.org X-Gm-Message-State: AOJu0Yy1DkKAjvUJ6WQUDHJ2gB3gxH+Aj+F6qq6uGDtCrY7MmeCZcbKO fHUcNfiNRZ4pcYDiTR4bcttRq5OVgWasvdGCkpS4vGDdNPbdQOAy+eE6loaX614KaMZSR+NKiAd fVYQrjpU1Am7SDS5S8Xi/1y2M6zW3ZdVzv3oGMCgF3BH4YS2OwVwikKBXXL4= X-Google-Smtp-Source: AGHT+IG0/Sg8YvnECSK7GV2NJsTOXSLgXIRXiVuzVAgRUG1C8KfWcQJ5eUQr5G0dAEr10p0umA0y5+yLQeAuCnx18GqAJ1pXvjgJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:2197:b0:430:b32d:c197 with SMTP id e9e14a558f8ab-430b32dc94bmr22039435ab.27.1760554037558; Wed, 15 Oct 2025 11:47:17 -0700 (PDT) Date: Wed, 15 Oct 2025 11:47:17 -0700 In-Reply-To: <20251015125945.481950-1-hao.ge@linux.dev> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68efec35.050a0220.91a22.02cb.GAE@google.com> Subject: [syzbot ci] Re: slab: clear OBJEXTS_ALLOC_FAIL when freeing a slab From: syzbot ci To: akpm@linux-foundation.org, ast@kernel.org, cl@gentwo.org, gehao@kylinos.cn, hao.ge@linux.dev, harry.yoo@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rientjes@google.com, 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 [v4] slab: clear OBJEXTS_ALLOC_FAIL when freeing a slab https://lore.kernel.org/all/20251015125945.481950-1-hao.ge@linux.dev * [PATCH v4] slab: clear OBJEXTS_ALLOC_FAIL when freeing a slab and found the following issue: kernel BUG in __free_slab Full report is available here: https://ci.syzbot.org/series/61ff4fe1-2e84-410d-ad85-42ead772d9c8 *** kernel BUG in __free_slab tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: 3a8660878839faadb4f1a6dd72c3179c1df56787 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/e5875084-ea86-418c-979d-5b00cded86ca/config syz repro: https://ci.syzbot.org/findings/1f8913d8-6d9a-448a-9419-90b758c82c3b/syz_repro ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f ------------[ cut here ]------------ kernel BUG at mm/slab.h:544! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/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_obj_exts mm/slab.h:543 [inline] RIP: 0010:free_slab_obj_exts mm/slub.c:2178 [inline] RIP: 0010:unaccount_slab mm/slub.c:3186 [inline] RIP: 0010:__free_slab+0x1b8/0x1e0 mm/slub.c:3286 Code: e8 2d 8a 0c ff 90 0f 0b 48 89 df 48 c7 c6 18 ad 91 8d e8 1b 8a 0c ff 90 0f 0b 48 89 df 48 c7 c6 9d 66 95 8d e8 09 8a 0c ff 90 <0f> 0b 48 89 df 48 c7 c6 18 ad 91 8d e8 f7 89 0c ff 90 0f 0b 48 89 RSP: 0000:ffffc900001478b0 EFLAGS: 00010246 RAX: 680205e52e87ff00 RBX: ffffea00044c3c80 RCX: 680205e52e87ff00 RDX: 0000000000000000 RSI: ffffffff8d7e835a RDI: ffffffff8bc076e0 RBP: 0000000000000001 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: ffffffff821b61b0 R13: ffffffff81a82877 R14: ffff888160415a00 R15: ffffea00044c3c98 FS: 0000000000000000(0000) GS:ffff88818e70c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef42bb12f8 CR3: 000000000df38000 CR4: 00000000000006f0 Call Trace: rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x286/0x870 kernel/softirq.c:622 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1063 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:slab_obj_exts mm/slab.h:543 [inline] RIP: 0010:free_slab_obj_exts mm/slub.c:2178 [inline] RIP: 0010:unaccount_slab mm/slub.c:3186 [inline] RIP: 0010:__free_slab+0x1b8/0x1e0 mm/slub.c:3286 Code: e8 2d 8a 0c ff 90 0f 0b 48 89 df 48 c7 c6 18 ad 91 8d e8 1b 8a 0c ff 90 0f 0b 48 89 df 48 c7 c6 9d 66 95 8d e8 09 8a 0c ff 90 <0f> 0b 48 89 df 48 c7 c6 18 ad 91 8d e8 f7 89 0c ff 90 0f 0b 48 89 RSP: 0000:ffffc900001478b0 EFLAGS: 00010246 RAX: 680205e52e87ff00 RBX: ffffea00044c3c80 RCX: 680205e52e87ff00 RDX: 0000000000000000 RSI: ffffffff8d7e835a RDI: ffffffff8bc076e0 RBP: 0000000000000001 R08: ffffffff8f9e1177 R09: 1ffffffff1f3c22e R10: dffffc0000000000 R11: fffffbfff1f3c22f R12: ffffffff821b61b0 R13: ffffffff81a82877 R14: ffff888160415a00 R15: ffffea00044c3c98 FS: 0000000000000000(0000) GS:ffff88818e70c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fef42bb12f8 CR3: 000000000df38000 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.