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Message-ID: <000000000000b4cf9a062114d132@google.com> Date: Sun, 01 Sep 2024 13:39:21 -0700 From: syzbot <syzbot+9bff4c7b992038a7409f@...kaller.appspotmail.com> To: konishi.ryusuke@...il.com, linux-kernel@...r.kernel.org, linux-nilfs@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [nilfs?] general protection fault in nilfs_btree_insert (2) Hello, syzbot found the following issue on: HEAD commit: 86987d84b968 Merge tag 'v6.11-rc5-client-fixes' of git://g.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c2b835980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0455552d0b27491 dashboard link: https://syzkaller.appspot.com/bug?extid=9bff4c7b992038a7409f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16fcc40d980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=143f1643980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/87692913ef45/disk-86987d84.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a27da6973d7f/vmlinux-86987d84.xz kernel image: https://storage.googleapis.com/syzbot-assets/2e28d02ce725/bzImage-86987d84.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e3fe6fbe935d/mount_0.gz Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17f5280d980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=140d280d980000 console output: https://syzkaller.appspot.com/x/log.txt?x=100d280d980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9bff4c7b992038a7409f@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 5220 Comm: syz-executor243 Not tainted 6.11.0-rc5-syzkaller-00057-g86987d84b968 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline] RIP: 0010:nilfs_btree_prepare_insert fs/nilfs2/btree.c:1091 [inline] RIP: 0010:nilfs_btree_insert+0x6d3/0x1c10 fs/nilfs2/btree.c:1252 Code: 8d 9f 80 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ab 89 8a fe 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 8e 89 8a fe 4c 89 64 24 28 48 8b RSP: 0018:ffffc9000352f4e0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 1ffff1100f66a0ee RDX: ffff88807d6f9e00 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffffc9000352f670 R08: ffffffff836d1ea6 R09: 1ffff1100469939a R10: dffffc0000000000 R11: ffffed100469939b R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88807fbd9680 FS: 0000555573e9d380(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc785a110f8 CR3: 000000007ea40000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> nilfs_bmap_do_insert fs/nilfs2/bmap.c:129 [inline] nilfs_bmap_insert+0x25e/0x3c0 fs/nilfs2/bmap.c:155 nilfs_get_block+0x428/0x8e0 fs/nilfs2/inode.c:101 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2125 __block_write_begin fs/buffer.c:2174 [inline] block_write_begin+0x9b/0x1e0 fs/buffer.c:2235 nilfs_write_begin+0xa0/0x110 fs/nilfs2/inode.c:262 generic_perform_write+0x399/0x840 mm/filemap.c:4019 generic_file_write_iter+0xaf/0x310 mm/filemap.c:4147 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc785999a99 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff8363c328 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc785999a99 RDX: 0000000000004000 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007fc785a0d5f0 R08: 0000555573e9e4c0 R09: 0000555573e9e4c0 R10: 0000000000000a83 R11: 0000000000000246 R12: 00007fff8363c350 R13: 00007fff8363c578 R14: 431bde82d7b634db R15: 00007fc7859e203b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline] RIP: 0010:nilfs_btree_prepare_insert fs/nilfs2/btree.c:1091 [inline] RIP: 0010:nilfs_btree_insert+0x6d3/0x1c10 fs/nilfs2/btree.c:1252 Code: 8d 9f 80 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 ab 89 8a fe 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 8e 89 8a fe 4c 89 64 24 28 48 8b RSP: 0018:ffffc9000352f4e0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 1ffff1100f66a0ee RDX: ffff88807d6f9e00 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffffc9000352f670 R08: ffffffff836d1ea6 R09: 1ffff1100469939a R10: dffffc0000000000 R11: ffffed100469939b R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88807fbd9680 FS: 0000555573e9d380(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005582b0414000 CR3: 000000007ea40000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8d 9f 80 00 00 00 lea 0x80(%rdi),%ebx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 ab 89 8a fe call 0xfe8a89c7 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 28 add $0x28,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 8e 89 8a fe call 0xfe8a89c7 39: 4c 89 64 24 28 mov %r12,0x28(%rsp) 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, 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 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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