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kernel BUG at fs/namei.c:LINE!

Status: fixed on 2020/02/18 14:31
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+79eb0f3df962caf839ed@syzkaller.appspotmail.com
Fix commit: c64cd6e34ea3 reimplement path_mountpoint() with less magic
First crash: 1725d, last: 1724d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
kernel BUG at fs/namei.c:LINE! 1 (2) 2020/01/14 06:58

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/namei.c:684!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9654 Comm: syz-executor.0 Not tainted 5.5.0-rc5-next-20200113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unlazy_walk+0x306/0x3b0 fs/namei.c:684
Code: ff ff ff e8 6c 3f a1 ff e8 e7 d8 b3 ff 48 c7 c6 74 6c c1 81 48 c7 c7 00 f7 ba 89 e8 e4 97 99 ff e9 d8 fe ff ff e8 ca d8 b3 ff <0f> 0b e8 c3 d8 b3 ff 0f 0b e8 bc d8 b3 ff e8 27 86 a0 ff 31 ff 89
RSP: 0018:ffffc9000260fba0 EFLAGS: 00010293
RAX: ffff888094ec4180 RBX: ffffc9000260fc60 RCX: ffffffff81c16a16
RDX: 0000000000000000 RSI: ffffffff81c16ca6 RDI: 0000000000000005
RBP: ffffc9000260fbd0 R08: ffff888094ec4180 R09: ffff888094ec4a18
R10: fffffbfff1549b88 R11: ffffffff8aa4dc47 R12: 0000000000000009
R13: ffffc9000260fc68 R14: ffff888091f9ae40 R15: 0000000000000000
FS:  0000000000b7b940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00048d000 CR3: 000000007d64c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 path_mountpoint.isra.0+0x1d5/0x340 fs/namei.c:2788
 filename_mountpoint+0x181/0x380 fs/namei.c:2809
 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2839
 ksys_umount+0x164/0xef0 fs/namespace.c:1683
 __do_sys_umount fs/namespace.c:1709 [inline]
 __se_sys_umount fs/namespace.c:1707 [inline]
 __x64_sys_umount+0x54/0x80 fs/namespace.c:1707
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d977
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fffb95eaec8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 000000000001a3ee RCX: 000000000045d977
RDX: 0000000000403720 RSI: 0000000000000002 RDI: 00007fffb95eaf70
RBP: 0000000000000002 R08: 0000000000000000 R09: 000000000000000e
R10: 000000000000000a R11: 0000000000000206 R12: 00007fffb95ec000
R13: 0000000000b7c940 R14: 0000000000000000 R15: 00007fffb95ec000
Modules linked in:
---[ end trace 5d55e60d2bb74bed ]---
RIP: 0010:unlazy_walk+0x306/0x3b0 fs/namei.c:684
Code: ff ff ff e8 6c 3f a1 ff e8 e7 d8 b3 ff 48 c7 c6 74 6c c1 81 48 c7 c7 00 f7 ba 89 e8 e4 97 99 ff e9 d8 fe ff ff e8 ca d8 b3 ff <0f> 0b e8 c3 d8 b3 ff 0f 0b e8 bc d8 b3 ff e8 27 86 a0 ff 31 ff 89
RSP: 0018:ffffc9000260fba0 EFLAGS: 00010293
RAX: ffff888094ec4180 RBX: ffffc9000260fc60 RCX: ffffffff81c16a16
RDX: 0000000000000000 RSI: ffffffff81c16ca6 RDI: 0000000000000005
RBP: ffffc9000260fbd0 R08: ffff888094ec4180 R09: ffff888094ec4a18
R10: fffffbfff1549b88 R11: ffffffff8aa4dc47 R12: 0000000000000009
R13: ffffc9000260fc68 R14: ffff888091f9ae40 R15: 0000000000000000
FS:  0000000000b7b940(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000b84978 CR3: 000000007d64c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3593):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/01/14 06:50 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:43 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:35 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:26 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:19 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:11 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 06:03 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:55 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:47 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:39 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:31 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:24 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:16 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:08 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 05:00 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:51 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:43 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:35 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:28 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:20 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:13 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 04:06 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:57 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:49 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:42 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:34 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:26 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:18 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 03:09 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:57 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:49 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:41 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:33 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:26 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:18 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:10 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 02:02 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 01:55 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 01:47 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 01:40 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 01:32 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/14 01:24 linux-next 8a28e614e1db 32881205 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/13 19:28 linux-next 8a28e614e1db 99565c1a .config console log report ci-upstream-linux-next-kasan-gce-root
2020/01/13 07:35 linux-next 8a28e614e1db 53faa9fe .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.