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general protection fault in d_alloc_pseudo

Status: closed as invalid on 2019/06/23 05:33
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+57dc50baaee299931092@syzkaller.appspotmail.com
First crash: 1838d, last: 1837d
Cause bisection: introduced by (bisect log) :
commit 56deac897903018e2672de8b784749f948e44be1
Author: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat Mar 16 02:23:19 2019 +0000

  dcache: sort the freeing-without-RCU-delay mess for good.

Crash: general protection fault in d_alloc_pseudo (log)
Repro: C syz .config
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
general protection fault in d_alloc_pseudo 0 (1) 2019/04/08 11:34

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 7543 Comm: syz-executor982 Not tainted 5.1.0-rc3-next-20190408 #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:d_alloc_pseudo+0x33/0x70 fs/dcache.c:1752
Code: 41 54 49 89 fc 48 83 ec 08 e8 39 d9 b7 ff 4c 89 ee 4c 89 e7 e8 1e f1 ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <0f> b6 14 11 84 d2 74 05 80 fa 03 7e 10 81 08 00 00 00 40 48 83 c4
RSP: 0018:ffff88808e77fd28 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff11011ceffad RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81b8a01f RDI: 0000000000000282
RBP: ffff88808e77fd40 R08: ffff8880913c2380 R09: ffffed1015d25bc8
R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: ffff88821b742cc0
R13: ffff88808e77fd88 R14: ffff88821b6a0628 R15: ffff888095d1f0f0
FS:  000000000195e880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004b6058 CR3: 000000008dafa000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 alloc_file_pseudo+0xe2/0x280 fs/file_table.c:224
 sock_alloc_file+0x4d/0x170 net/socket.c:406
 sock_map_fd net/socket.c:429 [inline]
 __sys_socket+0x150/0x220 net/socket.c:1495
 __do_sys_socket net/socket.c:1500 [inline]
 __se_sys_socket net/socket.c:1498 [inline]
 __x64_sys_socket+0x73/0xb0 net/socket.c:1498
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4412e9
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 0b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdb62abef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004412e9
RDX: 0000000000000073 RSI: 0000000000000002 RDI: 0000000000000002
RBP: 00000000006cc018 R08: 0000000000000001 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402180
R13: 0000000000402210 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 8205b4b5db42318a ]---
RIP: 0010:d_alloc_pseudo+0x33/0x70 fs/dcache.c:1752
Code: 41 54 49 89 fc 48 83 ec 08 e8 39 d9 b7 ff 4c 89 ee 4c 89 e7 e8 1e f1 ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <0f> b6 14 11 84 d2 74 05 80 fa 03 7e 10 81 08 00 00 00 40 48 83 c4
RSP: 0018:ffff88808e77fd28 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 1ffff11011ceffad RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff81b8a01f RDI: 0000000000000282
RBP: ffff88808e77fd40 R08: ffff8880913c2380 R09: ffffed1015d25bc8
R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: ffff88821b742cc0
R13: ffff88808e77fd88 R14: ffff88821b6a0628 R15: ffff888095d1f0f0
FS:  000000000195e880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004b6058 CR3: 000000008dafa000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (149):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/04/08 07:30 linux-next ac5b84a1ffe9 c34fde03 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/04/09 07:18 linux-next ac5b84a1ffe9 995065ff .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 06:48 linux-next ac5b84a1ffe9 995065ff .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 05:17 linux-next ac5b84a1ffe9 995065ff .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 03:47 linux-next ac5b84a1ffe9 995065ff .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 02:12 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 02:01 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/09 00:55 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 23:48 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 22:50 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 21:18 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 20:09 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 19:09 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 17:53 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 16:45 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 16:39 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 15:38 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 14:36 linux-next ac5b84a1ffe9 0dfb0452 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:30 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:30 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:21 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:10 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:10 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:05 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 13:03 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 12:59 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 12:46 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 12:22 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 12:12 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:51 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:43 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:30 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:27 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:21 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:15 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:05 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 11:04 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 10:51 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 10:44 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 10:39 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 10:37 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/04/08 10:37 linux-next ac5b84a1ffe9 c34fde03 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.