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Message-ID: <0000000000004dbd4f06196af76f@google.com> Date: Mon, 27 May 2024 01:04:26 -0700 From: syzbot <syzbot+79388700e25aa19555b9@...kaller.appspotmail.com> To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...hat.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org Subject: [syzbot] [kernel?] BUG: unable to handle kernel NULL pointer dereference in deactivate_slab Hello, syzbot found the following issue on: HEAD commit: 1613e604df0c Linux 6.10-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15410752980000 kernel config: https://syzkaller.appspot.com/x/.config?x=733cc7a95171d8e7 dashboard link: https://syzkaller.appspot.com/bug?extid=79388700e25aa19555b9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-1613e604.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bdfe02141e4c/vmlinux-1613e604.xz kernel image: https://storage.googleapis.com/syzbot-assets/9e655c2629f1/bzImage-1613e604.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+79388700e25aa19555b9@...kaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000001 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 256e3067 P4D 256e3067 PUD 4977c067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 3 PID: 56 Comm: kworker/3:1 Not tainted 6.10.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: slub_flushwq flush_cpu_slab RIP: 0010:PagePoisoned include/linux/page-flags.h:296 [inline] RIP: 0010:page_to_nid include/linux/mm.h:1664 [inline] RIP: 0010:folio_nid include/linux/mm.h:1670 [inline] RIP: 0010:slab_nid mm/slab.h:194 [inline] RIP: 0010:deactivate_slab+0x1b/0x4a0 mm/slub.c:2880 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 89 f6 41 55 41 54 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 08 48 83 f8 ff 0f 84 c3 03 00 00 48 8b 06 48 RSP: 0018:ffffc9000076fbb0 EFLAGS: 00010282 RAX: 0000000000000002 RBX: ffffe8ffad339190 RCX: 1ffffffff28415f8 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888021133540 RBP: ffffc9000076fc88 R08: 0000000000000001 R09: fffffbfff283ee5e R10: ffffffff941f72f7 R11: ffffffff81e16fea R12: 0000000000000200 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000001 CR3: 000000001b47c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> flush_slab mm/slub.c:3100 [inline] flush_cpu_slab+0x141/0x410 mm/slub.c:3146 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Modules linked in: CR2: 0000000000000001 ---[ end trace 0000000000000000 ]--- RIP: 0010:PagePoisoned include/linux/page-flags.h:296 [inline] RIP: 0010:page_to_nid include/linux/mm.h:1664 [inline] RIP: 0010:folio_nid include/linux/mm.h:1670 [inline] RIP: 0010:slab_nid mm/slab.h:194 [inline] RIP: 0010:deactivate_slab+0x1b/0x4a0 mm/slub.c:2880 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56 49 89 f6 41 55 41 54 53 48 83 e4 f0 48 81 ec b0 00 00 00 <48> 8b 06 48 89 54 24 08 48 83 f8 ff 0f 84 c3 03 00 00 48 8b 06 48 RSP: 0018:ffffc9000076fbb0 EFLAGS: 00010282 RAX: 0000000000000002 RBX: ffffe8ffad339190 RCX: 1ffffffff28415f8 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888021133540 RBP: ffffc9000076fc88 R08: 0000000000000001 R09: fffffbfff283ee5e R10: ffffffff941f72f7 R11: ffffffff81e16fea R12: 0000000000000200 R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000001 CR3: 000000001b47c000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 55 push %rbp 10: 48 89 e5 mov %rsp,%rbp 13: 41 57 push %r15 15: 41 56 push %r14 17: 49 89 f6 mov %rsi,%r14 1a: 41 55 push %r13 1c: 41 54 push %r12 1e: 53 push %rbx 1f: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp 23: 48 81 ec b0 00 00 00 sub $0xb0,%rsp * 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction 2d: 48 89 54 24 08 mov %rdx,0x8(%rsp) 32: 48 83 f8 ff cmp $0xffffffffffffffff,%rax 36: 0f 84 c3 03 00 00 je 0x3ff 3c: 48 8b 06 mov (%rsi),%rax 3f: 48 rex.W --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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