Messages in this thread | | | Date | Fri, 28 Dec 2018 18:41:04 -0800 | Subject | BUG: unable to handle kernel paging request in slhc_free | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 8fe28cb58bcb Linux 4.20 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16771b15400000 kernel config: https://syzkaller.appspot.com/x/.config?x=7d581260bae0899a dashboard link: https://syzkaller.appspot.com/bug?extid=6c5d567447bfa30f78e2 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136130fd400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1607c563400000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6c5d567447bfa30f78e2@syzkaller.appspotmail.com
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440359 RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000001 R09: 0000000000000039 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 BUG: unable to handle kernel paging request at fffffffffffffff4 PGD 946d067 P4D 946d067 PUD 946f067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8225 Comm: syz-executor096 Not tainted 4.20.0 #167 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:slhc_free+0x30/0xb0 drivers/net/slip/slhc.c:159 Code: 53 48 89 fb e8 71 04 ad fc 48 85 db 74 74 e8 67 04 ad fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 69 <4c> 8b 23 4d 85 e4 74 0d e8 43 04 ad fc 4c 89 e7 e8 bb e1 ef fc e8 RSP: 0018:ffff8881c1a0f770 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 1ffff1103408b936 RDX: 1ffffffffffffffe RSI: ffffffff84d15439 RDI: fffffffffffffff4 RBP: ffff8881c1a0f780 R08: ffff8881a045c9b0 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881a045c0c0 R12: 00000000ffffff97 R13: ffff8881c0ca04c0 R14: ffff8881c0daed00 R15: ffff8881c2152ac0 FS: 000000000078a880(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 00000001b0909000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: sl_alloc_bufs drivers/net/slip/slip.c:196 [inline] slip_open+0xdee/0x1107 drivers/net/slip/slip.c:821 tty_ldisc_open.isra.1+0x8b/0xe0 drivers/tty/tty_ldisc.c:453 tty_set_ldisc+0x2dc/0x6a0 drivers/tty/tty_ldisc.c:578 tiocsetd drivers/tty/tty_io.c:2321 [inline] tty_ioctl+0x39d/0x17d0 drivers/tty/tty_io.c:2581 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x440359 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff63454bb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440359 RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000001 R09: 0000000000000039 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: fffffffffffffff4 ---[ end trace 45b654871fafdc18 ]--- RIP: 0010:slhc_free+0x30/0xb0 drivers/net/slip/slhc.c:159 Code: 53 48 89 fb e8 71 04 ad fc 48 85 db 74 74 e8 67 04 ad fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 69 <4c> 8b 23 4d 85 e4 74 0d e8 43 04 ad fc 4c 89 e7 e8 bb e1 ef fc e8 RSP: 0018:ffff8881c1a0f770 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: 1ffff1103408b936 RDX: 1ffffffffffffffe RSI: ffffffff84d15439 RDI: fffffffffffffff4 RBP: ffff8881c1a0f780 R08: ffff8881a045c9b0 R09: 0000000000000006 R10: 0000000000000000 R11: ffff8881a045c0c0 R12: 00000000ffffff97 R13: ffff8881c0ca04c0 R14: ffff8881c0daed00 R15: ffff8881c2152ac0 FS: 000000000078a880(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff4 CR3: 00000001b0909000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
--- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.
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