Messages in this thread | | | From | Dmitry Vyukov <> | Date | Fri, 29 May 2020 15:20:21 +0200 | Subject | Re: PANIC: double fault in fixup_bad_iret |
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On Fri, May 29, 2020 at 3:14 PM syzbot <syzbot+dc1fa714cb070b184db5@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 7b4cb0a4 Add linux-next specific files for 20200525 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=15dc34ba100000 > kernel config: https://syzkaller.appspot.com/x/.config?x=47b0740d89299c10 > dashboard link: https://syzkaller.appspot.com/bug?extid=dc1fa714cb070b184db5 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14678626100000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1017ef06100000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+dc1fa714cb070b184db5@syzkaller.appspotmail.com
From the reproducer it seems to be either x86 related or ptrace related.
> traps: PANIC: double fault, error_code: 0x0 > double fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 7280 Comm: syz-executor776 Not tainted 5.7.0-rc7-next-20200525-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:fixup_bad_iret+0x24/0x170 arch/x86/kernel/traps.c:665 > Code: eb cb 0f 1f 40 00 41 55 49 bd 00 00 00 00 00 fc ff df 41 54 55 48 89 fd 48 c7 c7 80 8a 25 88 53 48 81 ec 40 01 00 00 48 89 e3 <48> c7 04 24 b3 8a b5 41 48 c7 44 24 08 bf d3 49 89 48 c1 eb 03 48 > RSP: 0018:fffffe0000001fb8 EFLAGS: 00010086 > RAX: fffffffffffffff7 RBX: fffffe0000001fb8 RCX: ffffffff87e00d57 > RDX: 0000000000000000 RSI: ffffffff87e009c8 RDI: ffffffff88258a80 > RBP: fffffe0000002120 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000001f65880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: fffffe0000001fa8 CR3: 00000000a02aa000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <ENTRY_TRAMPOLINE> > error_entry+0xb8/0xc0 arch/x86/entry/entry_64.S:1375 > RIP: 0010:native_irq_return_iret+0x0/0x2 > Code: 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 10 00 00 00 90 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57 0f 01 f8 0f 1f 00 65 48 8b 3c 25 00 b0 01 00 48 89 07 48 > RSP: 0018:fffffe00000021d8 EFLAGS: 00010046 ORIG_RAX: 0000000000000000 > RAX: fffffffffffffff7 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000100 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > RIP: 0033:0x3bfd19e0df38d197 > Code: Bad RIP value. > RSP: 002b:00007fffaaa547c8 EFLAGS: 00000346 </ENTRY_TRAMPOLINE> > Modules linked in: > ---[ end trace d6561a908e3835a1 ]--- > RIP: 0010:fixup_bad_iret+0x24/0x170 arch/x86/kernel/traps.c:665 > Code: eb cb 0f 1f 40 00 41 55 49 bd 00 00 00 00 00 fc ff df 41 54 55 48 89 fd 48 c7 c7 80 8a 25 88 53 48 81 ec 40 01 00 00 48 89 e3 <48> c7 04 24 b3 8a b5 41 48 c7 44 24 08 bf d3 49 89 48 c1 eb 03 48 > RSP: 0018:fffffe0000001fb8 EFLAGS: 00010086 > RAX: fffffffffffffff7 RBX: fffffe0000001fb8 RCX: ffffffff87e00d57 > RDX: 0000000000000000 RSI: ffffffff87e009c8 RDI: ffffffff88258a80 > RBP: fffffe0000002120 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000001f65880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: fffffe0000001fa8 CR3: 00000000a02aa000 CR4: 00000000001406f0 > 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. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000d2474c05a6c938fe%40google.com.
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