Messages in this thread | | | Date | Sat, 12 May 2018 10:01:02 -0700 | Subject | general protection fault in kernfs_kill_sb (2) | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: f0ab773f5c96 Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=140ce817800000 kernel config: https://syzkaller.appspot.com/x/.config?x=fcce42b221691ff9 dashboard link: https://syzkaller.appspot.com/bug?extid=481ad819c717f6b78df9 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15078e97800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12bf3697800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+481ad819c717f6b78df9@syzkaller.appspotmail.com
RBP: 00007ffc558bda60 R08: 0000000000000000 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000004 R14: 0000000000001380 R15: 00007ffc558bd2f8 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 4540 Comm: syz-executor884 Not tainted 4.17.0-rc4+ #43 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51 RSP: 0018:ffff8801aca6f860 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8801ac528498 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801ac5284a0 RBP: ffff8801aca6f878 R08: fffffbfff11cc855 R09: fffffbfff11cc854 R10: ffff8801aca6f878 R11: ffffffff88e642a7 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801aca6f908 R15: ffff8801ac528498 FS: 0000000000f86880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004b6f3c CR3: 00000001d9730000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:117 [inline] list_del include/linux/list.h:125 [inline] kernfs_kill_sb+0xa0/0x350 fs/kernfs/mount.c:361 sysfs_kill_sb+0x22/0x40 fs/sysfs/mount.c:50 deactivate_locked_super+0x97/0x100 fs/super.c:316 kernfs_mount_ns+0x753/0x8e0 fs/kernfs/mount.c:335 sysfs_mount+0xdf/0x200 fs/sysfs/mount.c:36 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4426a9 RSP: 002b:00007ffc558bd1b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004426a9 RDX: 00000000200000c0 RSI: 0000000020000080 RDI: 0000000020000040 RBP: 00007ffc558bda60 R08: 0000000000000000 R09: 0000000300000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000004 R14: 0000000000001380 R15: 00007ffc558bd2f8 Code: c5 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 48 b8 RIP: __list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51 RSP: ffff8801aca6f860 ---[ end trace d148f307a34e229f ]---
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syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.
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