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Message-ID: <6745a8df.050a0220.1286eb.0015.GAE@google.com> Date: Tue, 26 Nov 2024 02:54:23 -0800 From: syzbot <syzbot+e37a1730d63d207fe403@...kaller.appspotmail.com> To: gregkh@...uxfoundation.org, kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tj@...nel.org Subject: [syzbot] [kernfs?] [bcachefs?] general protection fault in kernfs_dop_revalidate Hello, syzbot found the following issue on: HEAD commit: 28eb75e178d3 Merge tag 'drm-next-2024-11-21' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17955b78580000 kernel config: https://syzkaller.appspot.com/x/.config?x=402159daa216c89d dashboard link: https://syzkaller.appspot.com/bug?extid=e37a1730d63d207fe403 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=163706e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e3c9c97af7d9/disk-28eb75e1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1e22f3d29103/vmlinux-28eb75e1.xz kernel image: https://storage.googleapis.com/syzbot-assets/8ff56ec30fa6/bzImage-28eb75e1.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/92ddc9fa5ec9/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e37a1730d63d207fe403@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] CPU: 0 UID: 0 PID: 5210 Comm: udevd Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] RIP: 0010:kernfs_dop_revalidate+0x8e/0x560 fs/kernfs/dir.c:1158 Code: c5 80 04 00 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 ef e8 c1 9e c1 ff 4c 8b 7d 00 4d 8d 67 30 4c 89 e3 48 c1 eb 03 <42> 80 3c 33 00 74 08 4c 89 e7 e8 a3 9e c1 ff 49 8b 6f 30 48 85 ed RSP: 0018:ffffc900033efa90 EFLAGS: 00010206 RAX: 1ffff1100c748639 RBX: 000000000000000a RCX: ffff88807deada00 RDX: ffff88807deada00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888063a431c8 R08: ffffffff823b3da8 R09: 1ffffffff20391a6 R10: dffffc0000000000 R11: ffffffff823b3d80 R12: 0000000000000051 R13: ffff88807affb318 R14: dffffc0000000000 R15: 0000000000000021 FS: 00007fa024cb5c80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe48c1ff000 CR3: 000000007d586000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> lookup_fast+0x1f4/0x4a0 walk_component+0x57/0x410 fs/namei.c:2108 lookup_last fs/namei.c:2610 [inline] path_lookupat+0x16f/0x450 fs/namei.c:2634 filename_lookup+0x2a3/0x670 fs/namei.c:2663 do_readlinkat+0xf0/0x3a0 fs/stat.c:562 __do_sys_readlink fs/stat.c:599 [inline] __se_sys_readlink fs/stat.c:596 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:596 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: 0033:0x7fa024917d47 Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdac68fa58 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffdac68fa68 RCX: 00007fa024917d47 RDX: 0000000000000400 RSI: 00007ffdac68fa68 RDI: 00007ffdac68ff48 RBP: 0000000000000400 R08: 000055b53fcce374 R09: 0000000000000000 R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffdac68ff48 R13: 00007ffdac68feb8 R14: 000055b53fcc3910 R15: 0000000000000000 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] RIP: 0010:kernfs_dop_revalidate+0x8e/0x560 fs/kernfs/dir.c:1158 Code: c5 80 04 00 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 ef e8 c1 9e c1 ff 4c 8b 7d 00 4d 8d 67 30 4c 89 e3 48 c1 eb 03 <42> 80 3c 33 00 74 08 4c 89 e7 e8 a3 9e c1 ff 49 8b 6f 30 48 85 ed RSP: 0018:ffffc900033efa90 EFLAGS: 00010206 RAX: 1ffff1100c748639 RBX: 000000000000000a RCX: ffff88807deada00 RDX: ffff88807deada00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888063a431c8 R08: ffffffff823b3da8 R09: 1ffffffff20391a6 R10: dffffc0000000000 R11: ffffffff823b3d80 R12: 0000000000000051 R13: ffff88807affb318 R14: dffffc0000000000 R15: 0000000000000021 FS: 00007fa024cb5c80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ee5ffff CR3: 000000007d586000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 80 04 00 00 addb $0x0,(%rax,%rax,1) 4: 48 89 e8 mov %rbp,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 10: 74 08 je 0x1a 12: 48 89 ef mov %rbp,%rdi 15: e8 c1 9e c1 ff call 0xffc19edb 1a: 4c 8b 7d 00 mov 0x0(%rbp),%r15 1e: 4d 8d 67 30 lea 0x30(%r15),%r12 22: 4c 89 e3 mov %r12,%rbx 25: 48 c1 eb 03 shr $0x3,%rbx * 29: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 a3 9e c1 ff call 0xffc19edb 38: 49 8b 6f 30 mov 0x30(%r15),%rbp 3c: 48 85 ed test %rbp,%rbp --- 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 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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