syzbot has found a reproducer for the following issue on: HEAD commit: bdffb18b5dd8 Add linux-next specific files for 20230804 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1625c47da80000 kernel config: https://syzkaller.appspot.com/x/.config?x=4edf5fc5e1e5446f dashboard link: https://syzkaller.appspot.com/bug?extid=0ad741797f4565e7e2d2 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=14b893bea80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16764a71a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9d65b99a07c2/disk-bdffb18b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8b9623d8bd2e/vmlinux-bdffb18b.xz kernel image: https://storage.googleapis.com/syzbot-assets/3e6c96c97edb/bzImage-bdffb18b.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/17c4ca724160/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0ad741797f4565e7e2d2@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc000000003a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001d0-0x00000000000001d7] CPU: 0 PID: 5323 Comm: segctord Not tainted 6.5.0-rc4-next-20230804-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] RIP: 0010:do_raw_spin_lock+0x6e/0x2b0 kernel/locking/spinlock_debug.c:114 Code: 81 48 8d 54 05 00 c7 02 f1 f1 f1 f1 c7 42 04 04 f3 f3 f3 65 48 8b 14 25 28 00 00 00 48 89 54 24 60 31 d2 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e3 RSP: 0018:ffffc9000507f6e8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 00000000000001d0 RCX: 0000000000000000 RDX: 000000000000003a RSI: ffffffff8ac889a0 RDI: 00000000000001d4 RBP: 1ffff92000a0fede R08: 0000000000000000 R09: fffffbfff1d598ca R10: ffffffff8eacc657 R11: 000000000000004e R12: 0000000000000000 R13: ffffea0001ca6bc0 R14: ffff888072088d98 R15: ffffea0001ca6bd8 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000480 CR3: 0000000027f80000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> spin_lock include/linux/spinlock.h:351 [inline] folio_create_empty_buffers+0xb0/0x470 fs/buffer.c:1657 nilfs_lookup_dirty_data_buffers+0x5a1/0x720 fs/nilfs2/segment.c:730 nilfs_segctor_scan_file+0x1b1/0x6f0 fs/nilfs2/segment.c:1080 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1202 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1529 [inline] nilfs_segctor_do_construct+0x2f11/0x8bf0 fs/nilfs2/segment.c:2077 nilfs_segctor_construct+0x924/0xb50 fs/nilfs2/segment.c:2411 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2519 [inline] nilfs_segctor_thread+0x38f/0xe90 fs/nilfs2/segment.c:2602 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] RIP: 0010:do_raw_spin_lock+0x6e/0x2b0 kernel/locking/spinlock_debug.c:114 Code: 81 48 8d 54 05 00 c7 02 f1 f1 f1 f1 c7 42 04 04 f3 f3 f3 65 48 8b 14 25 28 00 00 00 48 89 54 24 60 31 d2 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e3 RSP: 0018:ffffc9000507f6e8 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: 00000000000001d0 RCX: 0000000000000000 RDX: 000000000000003a RSI: ffffffff8ac889a0 RDI: 00000000000001d4 RBP: 1ffff92000a0fede R08: 0000000000000000 R09: fffffbfff1d598ca R10: ffffffff8eacc657 R11: 000000000000004e R12: 0000000000000000 R13: ffffea0001ca6bc0 R14: ffff888072088d98 R15: ffffea0001ca6bd8 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000480 CR3: 0000000027f80000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 81 48 8d 54 05 00 c7 orl $0xc7000554,-0x73(%rax) 7: 02 f1 add %cl,%dh 9: f1 int1 a: f1 int1 b: f1 int1 c: c7 42 04 04 f3 f3 f3 movl $0xf3f3f304,0x4(%rdx) 13: 65 48 8b 14 25 28 00 mov %gs:0x28,%rdx 1a: 00 00 1c: 48 89 54 24 60 mov %rdx,0x60(%rsp) 21: 31 d2 xor %edx,%edx 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 03 add $0x3,%eax 37: 38 d0 cmp %dl,%al 39: 7c 08 jl 0x43 3b: 84 d2 test %dl,%dl 3d: 0f .byte 0xf 3e: 85 e3 test %esp,%ebx --- 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.
