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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" X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 8B8BB180005 X-Stat-Signature: 75a96jy3dnhu4az61r5tx1fp9tjnrsnm X-Rspam-User: X-HE-Tag: 1760554038-838898 X-HE-Meta: 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 e2ovR/A8 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.