syzbot


WARNING in kmem_cache_create_usercopy

Status: fixed on 2019/01/15 20:25
Subsystems: v9fs
[Documentation on labels]
Reported-by: syzbot+0c1d61e4db7db94102ca@syzkaller.appspotmail.com
Fix commit: 574d356b7a02 9p/net: put a lower bound on msize
First crash: 1975d, last: 1879d
Discussions (9)
Title Replies (including bot) Last reply
[PATCH 3.16 00/99] 3.16.65-rc1 review 106 (106) 2019/05/07 18:38
[PATCH 4.20 00/65] 4.20.2-stable review 75 (75) 2019/01/14 08:10
[PATCH 3.18 00/47] 3.18.132-stable review 52 (52) 2019/01/13 07:44
[PATCH 4.14 000/105] 4.14.93-stable review 116 (116) 2019/01/13 07:10
[PATCH 4.19 000/148] 4.19.15-stable review 152 (152) 2019/01/12 17:44
[PATCH 4.9 00/63] 4.9.150-stable review 67 (67) 2019/01/12 17:43
[PATCH 4.4 00/88] 4.4.170-stable review 102 (102) 2019/01/12 17:42
[PATCH] 9p/net: put a lower bound on msize 2 (2) 2018/11/20 06:03
WARNING in kmem_cache_create_usercopy 2 (3) 2018/11/07 02:29

Sample crash report:
WARNING: CPU: 0 PID: 6065 at mm/slab_common.c:473 kmem_cache_create_usercopy+0xad/0x240 mm/slab_common.c:473
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6065 Comm: syz-executor140 Not tainted 4.19.0-rc5-next-20180928+ #84
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d3/0x2c4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969
RIP: 0010:kmem_cache_create_usercopy+0xad/0x240 mm/slab_common.c:473
Code: 44 89 f0 25 00 60 de 04 45 85 ed 89 45 cc 75 0b 8b 45 d0 85 c0 0f 85 8e 01 00 00 44 39 eb 72 0a 89 d8 44 29 e8 3b 45 d0 73 7e <0f> 0b c7 45 d0 00 00 00 00 4c 8b 45 10 44 89 fa 89 de 4c 89 e7 8b
RSP: 0018:ffff8801bc23f5d0 EFLAGS: 00010213
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000006
RDX: 0000000000000000 RSI: 0000000000000020 RDI: ffffffff88b04b20
RBP: ffff8801bc23f608 R08: fffffbfff1283a2d R09: fffffbfff1283a2c
R10: ffff8801bc23f5c0 R11: ffffffff8941d167 R12: ffffffff88b04b20
R13: 00000000fffffffd R14: 0000000000000000 R15: 0000000000000000
 p9_client_create+0xa58/0x1769 net/9p/client.c:1054
 v9fs_session_init+0x217/0x1bb0 fs/9p/v9fs.c:421
 v9fs_mount+0x7c/0x8f0 fs/9p/vfs_super.c:135
 legacy_get_tree+0x131/0x460 fs/fs_context.c:718
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1795
 do_new_mount fs/namespace.c:2648 [inline]
 do_mount+0x70c/0x1d90 fs/namespace.c:2974
 ksys_mount+0x12d/0x140 fs/namespace.c:3190
 __do_sys_mount fs/namespace.c:3204 [inline]
 __se_sys_mount fs/namespace.c:3201 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3201
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440189
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdd30ec3c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 0000000000440189
RDX: 00000000200008c0 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00000000006ca018 R08: 0000000020000a80 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401a10
R13: 0000000000401aa0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/09/29 15:10 linux-next 4794a36bf08d 41e4b329 .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2018/12/31 07:50 upstream 195303136f19 2b42fdc8 .config console log report ci-upstream-kasan-gce-smack-root
2018/12/25 09:15 upstream 8fe28cb58bcb 8a41a0ad .config console log report ci-upstream-kasan-gce-selinux-root
2018/12/23 10:53 upstream 9105b8aa50c1 e3bd7ab8 .config console log report ci-upstream-kasan-gce-selinux-root
2018/12/10 22:55 upstream 40e020c129cf 6565f24d .config console log report ci-upstream-kasan-gce-selinux-root
2018/11/22 05:44 linux-next 442b8cea2477 9db828b5 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/11/15 11:13 linux-next 442b8cea2477 5f5f6d14 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/10/14 09:52 linux-next 774ea0551a29 caf12900 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/29 14:55 linux-next 4794a36bf08d 41e4b329 .config console log report ci-upstream-linux-next-kasan-gce-root
2018/09/26 20:01 linux-next 9aa0219c6a4c 455b6354 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.