syzbot


kernel BUG at mm/gup.c:LINE!

Status: fixed on 2018/07/24 12:55
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+5dcb560fe12aa5091c06@syzkaller.appspotmail.com
Fix commit: 24962af7e104 fs, elf: make sure to page align bss in load_elf_library bb177a732c43 mm: do not bug_on on incorrect length in __mm_populate()
First crash: 2159d, last: 2157d
Discussions (9)
Title Replies (including bot) Last reply
[PATCH 3.16 000/366] 3.16.61-rc1 review 375 (376) 2019/01/02 17:44
[PATCH 4.4 000/160] 4.4.164-stable review 169 (169) 2018/11/21 07:59
[PATCH 4.9 00/83] 4.9.138-stable review 89 (89) 2018/11/20 20:39
[PATCH 4.17 00/67] 4.17.7-stable review 74 (74) 2018/07/17 09:41
[PATCH 4.9 00/32] 4.9.113-stable review 53 (53) 2018/07/17 08:14
[PATCH 4.14 00/54] 4.14.56-stable review 57 (57) 2018/07/17 08:04
[PATCH] fs, elf: Make sure to page align bss in load_elf_library 5 (5) 2018/07/06 22:55
Re: [PATCH] mm: do not bug_on on incorrect lenght in __mm_populate 3 (3) 2018/07/06 09:02
kernel BUG at mm/gup.c:LINE! 15 (16) 2018/07/06 07:40

Sample crash report:
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
------------[ cut here ]------------
kernel BUG at mm/gup.c:1242!
invalid opcode: 0000 [#1] SMP KASAN
CPU: 1 PID: 4837 Comm: syz-executor0 Not tainted 4.18.0-rc2+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__mm_populate+0x472/0x520 mm/gup.c:1242
Code: ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e aa 00 00 00 44 8b 75 98 45 31 e4 e9 58 ff ff ff e8 b5 9e d1 ff 0f 0b e8 ae 9e d1 ff <0f> 0b 48 8b bd 60 ff ff ff e8 d0 72 0f 00 e9 52 fc ff ff 48 8b bd 
RSP: 0018:ffff8801aae77ae0 EFLAGS: 00010293
RAX: ffff8801cfb48280 RBX: 0000000000008000 RCX: ffffffff81aa6a68
RDX: 0000000000000000 RSI: ffffffff81aa6dc2 RDI: 0000000000000006
RBP: ffff8801aae77ba0 R08: ffff8801cfb48280 R09: fffffbfff133d66a
R10: 0000000000000003 R11: 0000000000000000 R12: 000000007bf81000
R13: 0000000000007676 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:000000000865b900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080e3a94 CR3: 00000001cb021000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 mm_populate include/linux/mm.h:2296 [inline]
 vm_brk_flags+0x1fe/0x240 mm/mmap.c:3038
 vm_brk+0x1f/0x30 mm/mmap.c:3045
 load_elf_library+0x711/0x8e0 fs/binfmt_elf.c:1266
 __do_sys_uselib fs/exec.c:161 [inline]
 __se_sys_uselib fs/exec.c:120 [inline]
 __ia32_sys_uselib+0x37e/0x4c0 fs/exec.c:120
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7fcbcb9
Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000ff8df4ac EFLAGS: 00000282 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace f964ea7008b66351 ]---
RIP: 0010:__mm_populate+0x472/0x520 mm/gup.c:1242
Code: ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e aa 00 00 00 44 8b 75 98 45 31 e4 e9 58 ff ff ff e8 b5 9e d1 ff 0f 0b e8 ae 9e d1 ff <0f> 0b 48 8b bd 60 ff ff ff e8 d0 72 0f 00 e9 52 fc ff ff 48 8b bd 
RSP: 0018:ffff8801aae77ae0 EFLAGS: 00010293
RAX: ffff8801cfb48280 RBX: 0000000000008000 RCX: ffffffff81aa6a68
RDX: 0000000000000000 RSI: ffffffff81aa6dc2 RDI: 0000000000000006
RBP: ffff8801aae77ba0 R08: ffff8801cfb48280 R09: fffffbfff133d66a
R10: 0000000000000003 R11: 0000000000000000 R12: 000000007bf81000
R13: 0000000000007676 R14: dffffc0000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801daf00000(0063) knlGS:000000000865b900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080e3a94 CR3: 00000001cb021000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/02 01:24 upstream d3bc0e67f852 dba0b50e .config console log report syz ci-upstream-kasan-gce-386
2018/06/30 03:50 upstream 2cd3ae212973 dba0b50e .config console log report syz ci-upstream-kasan-gce-386
2018/07/02 00:23 upstream d3bc0e67f852 dba0b50e .config console log report ci-upstream-kasan-gce-386
2018/06/30 03:14 upstream 2cd3ae212973 dba0b50e .config console log report ci-upstream-kasan-gce-386
* Struck through repros no longer work on HEAD.