+ linux-mm syzbot folks: might wanna refresh your patterns on how this automated thing is deciding who to Cc. This is clearly a mm issue. On Mon, May 27, 2024 at 01:04:26AM -0700, syzbot wrote: > 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@xxxxxxxxxxxxxxxxxxxxxxxxx > > 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@xxxxxxxxxxxxxxxx. > > 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 -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
