Hello, syzbot found the following issue on: HEAD commit: a47fc304d2b6 Add linux-next specific files for 20230831 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1709eb67a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ecd2a74f20953b9 dashboard link: https://syzkaller.appspot.com/bug?extid=de4269ef04437bffcaa9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103ea770680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13206d04680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b2e8f4217527/disk-a47fc304.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed6cdcc09339/vmlinux-a47fc304.xz kernel image: https://storage.googleapis.com/syzbot-assets/bd9b2475bf5a/bzImage-a47fc304.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2c0bbd58005c/mount_1.gz Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=173b59afa80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=14bb59afa80000 console output: https://syzkaller.appspot.com/x/log.txt?x=10bb59afa80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de4269ef04437bffcaa9@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: 00000076000400c8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 4494 Comm: udevd Not tainted 6.5.0-next-20230831-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:__kmem_cache_alloc_bulk mm/slub.c:3986 [inline] RIP: 0010:kmem_cache_alloc_bulk+0x16a/0x7c0 mm/slub.c:4049 Code: 00 0f 85 1b 05 00 00 45 31 d2 4c 89 3c 24 65 48 8b 0c 25 c0 bc 03 00 4d 89 d7 48 89 4d 28 31 ed 48 89 4c 24 18 eb 2d 8b 43 28 <48> 8b 04 07 49 89 04 24 49 89 3b 0f 1f 44 00 00 4c 8b 1c 24 41 81 RSP: 0018:ffffc900031af878 EFLAGS: 00010006 RAX: 0000000000000080 RBX: ffff88801364d000 RCX: ffff88807d56bb80 RDX: 0000000000000000 RSI: ffffffff8ae925a0 RDI: 0000007600040048 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1d9c40a R10: 0000000000000000 R11: ffff888073edee10 R12: ffff8880b9841830 R13: 000000000000000e R14: ffff888073edee10 R15: 0000000000000000 FS: 00007ff1acb30c80(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000076000400c8 CR3: 00000000290ce000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> mt_alloc_bulk lib/maple_tree.c:165 [inline] mas_alloc_nodes+0x39c/0x830 lib/maple_tree.c:1271 mas_node_count_gfp+0x105/0x130 lib/maple_tree.c:1329 mas_node_count lib/maple_tree.c:1343 [inline] mas_expected_entries+0x116/0x200 lib/maple_tree.c:5577 vma_iter_bulk_alloc include/linux/mm.h:985 [inline] dup_mmap+0x4f8/0x1d80 kernel/fork.c:681 dup_mm kernel/fork.c:1686 [inline] copy_mm kernel/fork.c:1735 [inline] copy_process+0x6c11/0x7400 kernel/fork.c:2501 kernel_clone+0xfd/0x930 kernel/fork.c:2909 __do_sys_clone+0xba/0x100 kernel/fork.c:3052 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff1ac6fca12 Code: 41 5d 41 5e 41 5f c3 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 e7 43 0f 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fffc6413228 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000562ccc95ee01 RCX: 00007ff1ac6fca12 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000562ccc94b910 R10: 00007ff1acb30f50 R11: 0000000000000246 R12: 0000562ccc973450 R13: 0000000000000000 R14: 0000000000000000 R15: 0000562ccc94b910 </TASK> Modules linked in: CR2: 00000076000400c8 ---[ end trace 0000000000000000 ]--- RIP: 0010:__kmem_cache_alloc_bulk mm/slub.c:3986 [inline] RIP: 0010:kmem_cache_alloc_bulk+0x16a/0x7c0 mm/slub.c:4049 Code: 00 0f 85 1b 05 00 00 45 31 d2 4c 89 3c 24 65 48 8b 0c 25 c0 bc 03 00 4d 89 d7 48 89 4d 28 31 ed 48 89 4c 24 18 eb 2d 8b 43 28 <48> 8b 04 07 49 89 04 24 49 89 3b 0f 1f 44 00 00 4c 8b 1c 24 41 81 RSP: 0018:ffffc900031af878 EFLAGS: 00010006 RAX: 0000000000000080 RBX: ffff88801364d000 RCX: ffff88807d56bb80 RDX: 0000000000000000 RSI: ffffffff8ae925a0 RDI: 0000007600040048 RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1d9c40a R10: 0000000000000000 R11: ffff888073edee10 R12: ffff8880b9841830 R13: 000000000000000e R14: ffff888073edee10 R15: 0000000000000000 FS: 00007ff1acb30c80(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000076000400c8 CR3: 00000000290ce000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 0f add %cl,(%rdi) 2: 85 1b test %ebx,(%rbx) 4: 05 00 00 45 31 add $0x31450000,%eax 9: d2 4c 89 3c rorb %cl,0x3c(%rcx,%rcx,4) d: 24 65 and $0x65,%al f: 48 8b 0c 25 c0 bc 03 mov 0x3bcc0,%rcx 16: 00 17: 4d 89 d7 mov %r10,%r15 1a: 48 89 4d 28 mov %rcx,0x28(%rbp) 1e: 31 ed xor %ebp,%ebp 20: 48 89 4c 24 18 mov %rcx,0x18(%rsp) 25: eb 2d jmp 0x54 27: 8b 43 28 mov 0x28(%rbx),%eax * 2a: 48 8b 04 07 mov (%rdi,%rax,1),%rax <-- trapping instruction 2e: 49 89 04 24 mov %rax,(%r12) 32: 49 89 3b mov %rdi,(%r11) 35: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 3a: 4c 8b 1c 24 mov (%rsp),%r11 3e: 41 rex.B 3f: 81 .byte 0x81 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
