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Message-ID: <675bfbdc.050a0220.1a2d0d.0007.GAE@google.com> Date: Fri, 13 Dec 2024 01:18:20 -0800 From: syzbot <syzbot+a4aee0aec9e2bdcac817@...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 (2) Hello, syzbot found the following issue on: HEAD commit: 231825b2e1ff Revert "unicode: Don't special case ignorable.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1232acdf980000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7c9f223bfe8924e dashboard link: https://syzkaller.appspot.com/bug?extid=a4aee0aec9e2bdcac817 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/dc23b60ff29a/disk-231825b2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/377c8f65d53a/vmlinux-231825b2.xz kernel image: https://storage.googleapis.com/syzbot-assets/09bc1abb7c7a/bzImage-231825b2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a4aee0aec9e2bdcac817@...kaller.appspotmail.com BUG: kernel NULL pointer dereference, address: 0000000000000002 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 800000002f379067 P4D 800000002f379067 PUD 31b4e067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.13.0-rc2-syzkaller-00036-g231825b2e1ff #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: slub_flushwq flush_cpu_slab RIP: 0010:PagePoisoned include/linux/page-flags.h:293 [inline] RIP: 0010:page_to_nid include/linux/mm.h:1647 [inline] RIP: 0010:folio_nid include/linux/mm.h:1653 [inline] RIP: 0010:slab_nid mm/slab.h:201 [inline] RIP: 0010:deactivate_slab+0x1f/0x370 mm/slub.c:3028 Code: 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 48 49 89 f7 65 48 8b 04 25 28 00 00 00 48 89 44 24 40 <48> 8b 06 48 83 f8 ff 0f 84 12 03 00 00 49 89 fd 48 c1 e8 3a 48 8b RSP: 0018:ffffc900000e7ad8 EFLAGS: 00010296 RAX: 07d990de08412b00 RBX: 0000000000000202 RCX: ffffffff817b117a RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88802f7cb3c0 RBP: 0000000000000000 R08: ffffffff9426d8b7 R09: 1ffffffff284db16 R10: dffffc0000000000 R11: fffffbfff284db17 R12: 0000607f4766a0e0 R13: ffff88801bee0000 R14: ffff8880b8600000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000002 CR3: 000000007e682000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> flush_slab mm/slub.c:3248 [inline] flush_cpu_slab+0x195/0x450 mm/slub.c:3294 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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: 0000000000000002 ---[ end trace 0000000000000000 ]--- RIP: 0010:PagePoisoned include/linux/page-flags.h:293 [inline] RIP: 0010:page_to_nid include/linux/mm.h:1647 [inline] RIP: 0010:folio_nid include/linux/mm.h:1653 [inline] RIP: 0010:slab_nid mm/slab.h:201 [inline] RIP: 0010:deactivate_slab+0x1f/0x370 mm/slub.c:3028 Code: 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 48 49 89 f7 65 48 8b 04 25 28 00 00 00 48 89 44 24 40 <48> 8b 06 48 83 f8 ff 0f 84 12 03 00 00 49 89 fd 48 c1 e8 3a 48 8b RSP: 0018:ffffc900000e7ad8 EFLAGS: 00010296 RAX: 07d990de08412b00 RBX: 0000000000000202 RCX: ffffffff817b117a RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88802f7cb3c0 RBP: 0000000000000000 R08: ffffffff9426d8b7 R09: 1ffffffff284db16 R10: dffffc0000000000 R11: fffffbfff284db17 R12: 0000607f4766a0e0 R13: ffff88801bee0000 R14: ffff8880b8600000 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000002 CR3: 000000007e682000 CR4: 00000000003526f0 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: 55 push %rbp c: 41 57 push %r15 e: 41 56 push %r14 10: 41 55 push %r13 12: 41 54 push %r12 14: 53 push %rbx 15: 48 83 ec 48 sub $0x48,%rsp 19: 49 89 f7 mov %rsi,%r15 1c: 65 48 8b 04 25 28 00 mov %gs:0x28,%rax 23: 00 00 25: 48 89 44 24 40 mov %rax,0x40(%rsp) * 2a: 48 8b 06 mov (%rsi),%rax <-- trapping instruction 2d: 48 83 f8 ff cmp $0xffffffffffffffff,%rax 31: 0f 84 12 03 00 00 je 0x349 37: 49 89 fd mov %rdi,%r13 3a: 48 c1 e8 3a shr $0x3a,%rax 3e: 48 rex.W 3f: 8b .byte 0x8b --- 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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