* Re: WARNING in format_decode (2) [not found] <000000000000e12d4105746dcb0d@google.com> @ 2018-08-27 17:46 ` Steven Rostedt 2018-08-28 4:05 ` Alexei Starovoitov 2018-11-10 8:42 ` syzbot 1 sibling, 1 reply; 3+ messages in thread From: Steven Rostedt @ 2018-08-27 17:46 UTC (permalink / raw) To: syzbot Cc: linux-kernel, mingo, syzkaller-bugs, Alexei Starovoitov, Daniel Borkmann, netdev On Mon, 27 Aug 2018 10:10:04 -0700 syzbot <syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 2ad0d5269970 Merge git://git.kernel.org/pub/scm/linux/kern.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=15b8efba400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=79e695838ce7a210 > dashboard link: https://syzkaller.appspot.com/bug?extid=1ec5c5ec949c4adaa0c4 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1626f761400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com > > ** ** > ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > ********************************************************** > ------------[ cut here ]------------ > Please remove unsupported %WARNING: CPU: 0 PID: 6453 at lib/vsprintf.c:2149 format_decode+0x8fc/0xaf0 > lib/vsprintf.c:2149 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 0 PID: 6453 Comm: syz-executor7 Not tainted 4.18.0+ #190 > 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+0x1c9/0x2b4 lib/dump_stack.c:113 > panic+0x238/0x4e7 kernel/panic.c:184 > __warn.cold.8+0x163/0x1ba kernel/panic.c:536 > report_bug+0x252/0x2d0 lib/bug.c:186 > fixup_bug arch/x86/kernel/traps.c:178 [inline] > do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 > invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 > RIP: 0010:format_decode+0x8fc/0xaf0 lib/vsprintf.c:2149 > Code: e8 59 59 c9 fa 41 c6 04 24 12 e9 94 fd ff ff e8 4a 59 c9 fa 0f be f3 > 48 c7 c7 60 bc 89 87 c6 05 28 aa d2 01 01 e8 e4 e9 93 fa <0f> 0b 4d 8b 7d > c0 e9 56 fe ff ff 48 8b bd 68 ff ff ff e8 cd 4f 08 > RSP: 0018:ffff8801b6b27688 EFLAGS: 00010282 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff816422b1 RDI: ffff8801b6b27378 > RBP: ffff8801b6b27730 R08: ffff8801b69a0040 R09: 0000000000000006 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b6b277a8 > R13: ffff8801b6b27708 R14: 0000000000000000 R15: ffff8801b6b27b04 > vsnprintf+0x185/0x1b60 lib/vsprintf.c:2245 > vscnprintf+0x2d/0x80 lib/vsprintf.c:2396 > __trace_array_vprintk.part.60+0xc7/0x330 kernel/trace/trace.c:2990 > __trace_array_vprintk kernel/trace/trace.c:3021 [inline] > trace_array_vprintk kernel/trace/trace.c:3021 [inline] > trace_vprintk+0x5f/0x90 kernel/trace/trace.c:3059 > __trace_printk+0xce/0x120 kernel/trace/trace_printk.c:237 > ____bpf_trace_printk kernel/trace/bpf_trace.c:274 [inline] Looks like a bug in the bpf trace printk code. -- Steve > bpf_trace_printk+0xb16/0xc30 kernel/trace/bpf_trace.c:166 > bpf_prog_e51deac1441bc083+0x94a/0x1000 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > 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#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: WARNING in format_decode (2) 2018-08-27 17:46 ` WARNING in format_decode (2) Steven Rostedt @ 2018-08-28 4:05 ` Alexei Starovoitov 0 siblings, 0 replies; 3+ messages in thread From: Alexei Starovoitov @ 2018-08-28 4:05 UTC (permalink / raw) To: Steven Rostedt Cc: syzbot, linux-kernel, mingo, syzkaller-bugs, Daniel Borkmann, netdev On Mon, Aug 27, 2018 at 01:46:26PM -0400, Steven Rostedt wrote: > On Mon, 27 Aug 2018 10:10:04 -0700 > syzbot <syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com> wrote: > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: 2ad0d5269970 Merge git://git.kernel.org/pub/scm/linux/kern.. > > git tree: net-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=15b8efba400000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=79e695838ce7a210 > > dashboard link: https://syzkaller.appspot.com/bug?extid=1ec5c5ec949c4adaa0c4 > > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1626f761400000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com > > > > ** ** > > ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** > > ********************************************************** > > ------------[ cut here ]------------ > > Please remove unsupported %WARNING: CPU: 0 PID: 6453 at lib/vsprintf.c:2149 format_decode+0x8fc/0xaf0 > > lib/vsprintf.c:2149 > > Kernel panic - not syncing: panic_on_warn set ... > > > > CPU: 0 PID: 6453 Comm: syz-executor7 Not tainted 4.18.0+ #190 > > 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+0x1c9/0x2b4 lib/dump_stack.c:113 > > panic+0x238/0x4e7 kernel/panic.c:184 > > __warn.cold.8+0x163/0x1ba kernel/panic.c:536 > > report_bug+0x252/0x2d0 lib/bug.c:186 > > fixup_bug arch/x86/kernel/traps.c:178 [inline] > > do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 > > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 > > invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:993 > > RIP: 0010:format_decode+0x8fc/0xaf0 lib/vsprintf.c:2149 > > Code: e8 59 59 c9 fa 41 c6 04 24 12 e9 94 fd ff ff e8 4a 59 c9 fa 0f be f3 > > 48 c7 c7 60 bc 89 87 c6 05 28 aa d2 01 01 e8 e4 e9 93 fa <0f> 0b 4d 8b 7d > > c0 e9 56 fe ff ff 48 8b bd 68 ff ff ff e8 cd 4f 08 > > RSP: 0018:ffff8801b6b27688 EFLAGS: 00010282 > > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: ffffffff816422b1 RDI: ffff8801b6b27378 > > RBP: ffff8801b6b27730 R08: ffff8801b69a0040 R09: 0000000000000006 > > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801b6b277a8 > > R13: ffff8801b6b27708 R14: 0000000000000000 R15: ffff8801b6b27b04 > > vsnprintf+0x185/0x1b60 lib/vsprintf.c:2245 > > vscnprintf+0x2d/0x80 lib/vsprintf.c:2396 > > __trace_array_vprintk.part.60+0xc7/0x330 kernel/trace/trace.c:2990 > > __trace_array_vprintk kernel/trace/trace.c:3021 [inline] > > trace_array_vprintk kernel/trace/trace.c:3021 [inline] > > trace_vprintk+0x5f/0x90 kernel/trace/trace.c:3059 > > __trace_printk+0xce/0x120 kernel/trace/trace_printk.c:237 > > ____bpf_trace_printk kernel/trace/bpf_trace.c:274 [inline] > > Looks like a bug in the bpf trace printk code. yes. looks like %p% slipped past bpf_trace_printk() runtime checks. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: WARNING in format_decode (2) [not found] <000000000000e12d4105746dcb0d@google.com> 2018-08-27 17:46 ` WARNING in format_decode (2) Steven Rostedt @ 2018-11-10 8:42 ` syzbot 1 sibling, 0 replies; 3+ messages in thread From: syzbot @ 2018-11-10 8:42 UTC (permalink / raw) To: alexei.starovoitov, daniel, linux-kernel, mingo, netdev, rostedt, syzkaller-bugs syzbot has found a reproducer for the following crash on: HEAD commit: da85d8bfd151 kselftests/bpf: use ping6 as the default ipv6.. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=116bf533400000 kernel config: https://syzkaller.appspot.com/x/.config?x=8f559fee2fc3375a dashboard link: https://syzkaller.appspot.com/bug?extid=1ec5c5ec949c4adaa0c4 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16d03247400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=104f5533400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+1ec5c5ec949c4adaa0c4@syzkaller.appspotmail.com ** ** ** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ** ********************************************************** ------------[ cut here ]------------ Please remove unsupported %\0 in format string WARNING: CPU: 0 PID: 5654 at lib/vsprintf.c:2152 format_decode+0x8fc/0xaf0 lib/vsprintf.c:2152 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 5654 Comm: syz-executor818 Not tainted 4.20.0-rc1+ #80 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+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 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:format_decode+0x8fc/0xaf0 lib/vsprintf.c:2152 Code: e8 c9 37 b5 f9 41 c6 45 00 12 e9 9b fd ff ff e8 ba 37 b5 f9 0f be f3 48 c7 c7 c0 f1 d5 88 c6 05 d2 08 47 02 01 e8 74 99 7e f9 <0f> 0b 4d 8b 66 c0 e9 59 fe ff ff 48 8b bd 70 ff ff ff e8 6d 84 f8 RSP: 0018:ffff8801ba76f670 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165e9b5 RDI: 0000000000000005 RBP: ffff8801ba76f718 R08: ffff8801b6cfc0c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ba76faec R13: ffff8801ba76f790 R14: ffff8801ba76f6f0 R15: 0000000000000000 vsnprintf+0x185/0x1b60 lib/vsprintf.c:2248 vscnprintf+0x2d/0x80 lib/vsprintf.c:2399 __trace_array_vprintk.part.59+0x5b/0x2f0 kernel/trace/trace.c:2992 __trace_array_vprintk kernel/trace/trace.c:3023 [inline] trace_array_vprintk kernel/trace/trace.c:3023 [inline] trace_vprintk+0x71/0x90 kernel/trace/trace.c:3061 __trace_printk+0xce/0x120 kernel/trace/trace_printk.c:238 ____bpf_trace_printk kernel/trace/bpf_trace.c:271 [inline] bpf_trace_printk+0xb30/0xc50 kernel/trace/bpf_trace.c:163 bpf_prog_12183cdb1cd51dab+0x3e7/0x1000 Kernel Offset: disabled Rebooting in 86400 seconds.. ^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-08-27 17:46 ` WARNING in format_decode (2) Steven Rostedt
2018-08-28 4:05 ` Alexei Starovoitov
2018-11-10 8:42 ` syzbot
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