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Wed, 10 Sep 2025 01:39:29 -0700 (PDT) Date: Wed, 10 Sep 2025 01:39:29 -0700 In-Reply-To: <20250910005957.54108-1-rgbi3307@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68c13941.050a0220.3c6139.001d.GAE@google.com> Subject: [syzbot ci] Re: mm/slub: Removing unnecessary variable accesses in the get_freelist() From: syzbot ci To: 42.hyeyoo@gmail.com, akpm@linux-foundation.org, cl@linux.com, iamjoonsoo.kim@lge.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, penberg@kernel.org, rgbi3307@gmail.com, rgbi3307@naver.com, rientjes@google.com, roman.gushchin@linux.dev, vbabka@suse.cz Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 78CFCC0004 X-Stat-Signature: eyajoyurghk944ycs1obp4tf1i9ti7en X-Rspam-User: X-HE-Tag: 1757493570-876920 X-HE-Meta: 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 N1+WDCxS 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 3T1xFvA+ CQ4+3GcV9J/lFcqElNckQldywl0OiqxQnuABv5eWFAiacmL4QmFGu/dPa8IA6dQF 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 [v1] mm/slub: Removing unnecessary variable accesses in the get_freelist() https://lore.kernel.org/all/20250910005957.54108-1-rgbi3307@gmail.com * [PATCH] mm/slub: Removing unnecessary variable accesses in the get_freelist() and found the following issue: kernel BUG in __smpboot_create_thread Full report is available here: https://ci.syzbot.org/series/832d6128-4556-4bd1-ab18-0676b8e7dbc1 *** kernel BUG in __smpboot_create_thread tree: torvalds URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux base: f777d1112ee597d7f7dd3ca232220873a34ad0c8 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/7bff7792-4edd-4680-a5e7-3cc9d97ac5ed/config smpboot: CPU0: Intel QEMU Virtual CPU version 2.5+ (family: 0xf, model: 0x6b, stepping: 0x1) Performance Events: unsupported Netburst CPU model 107 no PMU driver, software events only. signal: max sigframe size: 1440 ------------[ cut here ]------------ kernel BUG at mm/slub.c:3832! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 1 Comm: swapper/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_alloc+0x13ab/0x1420 Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f RSP: 0000:ffffc90000047750 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001 RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55 R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480 R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55 FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88813ffff000 CR3: 000000000df36000 CR4: 00000000000006f0 Call Trace: __kmalloc_cache_node_noprof+0x29a/0x3d0 __smpboot_create_thread+0x11a/0x3b0 smpboot_register_percpu_thread+0xc6/0x420 spawn_ksoftirqd+0x2f/0xc0 do_one_initcall+0x236/0x820 do_pre_smp_initcalls+0x4c/0x80 kernel_init_freeable+0x30c/0x4b0 kernel_init+0x1d/0x1d0 ret_from_fork+0x3fc/0x770 ret_from_fork_asm+0x1a/0x30 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:___slab_alloc+0x13ab/0x1420 Code: ff ff 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 3e 4f 0f ff 90 0f 0b 90 0f 0b 48 89 f7 48 c7 c6 3a a1 a0 8d e8 29 4f 0f ff 90 0f 0b 90 <0f> 0b 90 0f 0b 4c 89 e7 48 c7 c6 3a a1 a0 8d e8 11 4f 0f ff 90 0f RSP: 0000:ffffc90000047750 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff888100028000 RCX: 0000000000800001 RDX: 0000000000800001 RSI: ffffffff8dba8965 RDI: ffffffff8be33980 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff82189e55 R10: dffffc0000000000 R11: fffffbfff1f47407 R12: ffff88804b03e480 R13: ffff88801a441640 R14: ffff88804b03e460 R15: ffffffff82189e55 FS: 0000000000000000(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88813ffff000 CR3: 000000000df36000 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.