Hello,
syzkaller hit the following crash on
61233580f1f33c50e159c50e24d80ffd2ba2e06b
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299" dev="sda1"
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
IPv6: Can't replace route, no match found
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: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009b70840
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
sock_sendmsg_nosec net/socket.c:636 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:646
sock_write_iter+0x31a/0x5d0 net/socket.c:915
call_write_iter include/linux/fs.h:1772 [inline]
do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
compat_writev+0x225/0x420 fs/read_write.c:1246
do_compat_writev+0x115/0x220 fs/read_write.c:1267
C_SYSC_writev fs/read_write.c:1278 [inline]
compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f1fc79
RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8 db
a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00
0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
---[ end trace 956c65133fcfff88 ]---
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to [email protected].
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.
[ [email protected] ]
On 1/2/18 3:58 PM, syzbot wrote:
> Hello,
>
> syzkaller hit the following crash on
> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached
> Raw console output is attached.
> C reproducer is attached
> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> for information about syzkaller reproducers
>
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
>
> audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
> pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299"
> dev="sda1" ino=16481
> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
> IPv6: Can't replace route, no match found
> 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: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
> RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
> RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
> RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
> R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
> FS: 0000000000000000(0000) GS:ffff8801db200000(0063)
> knlGS:0000000009b70840
> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
> ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
> inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
> rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
> netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
> netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
> netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
> netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
> sock_sendmsg_nosec net/socket.c:636 [inline]
> sock_sendmsg+0xca/0x110 net/socket.c:646
> sock_write_iter+0x31a/0x5d0 net/socket.c:915
> call_write_iter include/linux/fs.h:1772 [inline]
> do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
> do_iter_write+0x154/0x540 fs/read_write.c:932
> compat_writev+0x225/0x420 fs/read_write.c:1246
> do_compat_writev+0x115/0x220 fs/read_write.c:1267
> C_SYSC_writev fs/read_write.c:1278 [inline]
> compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
> RIP: 0023:0xf7f1fc79
> RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
> RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
> RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8
> db a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c
> 02 00 0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
> RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
> ---[ end trace 956c65133fcfff88 ]---
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to [email protected].
>
> 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.
On Wed, Jan 3, 2018 at 8:16 AM, David Ahern <[email protected]> wrote:
> [ [email protected] ]
>
> On 1/2/18 3:58 PM, syzbot wrote:
>> Hello,
>>
>> syzkaller hit the following crash on
>> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>> C reproducer is attached
>> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> for information about syzkaller reproducers
>>
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: [email protected]
>> It will help syzbot understand when the bug is fixed. See footer for
>> details.
>> If you forward the report, please keep this part and the footer.
>>
>> audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
>> pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299"
>> dev="sda1" ino=16481
>> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
>> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
>> IPv6: Can't replace route, no match found
>> 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: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
pn could be NULL if fib6_add_1() failed. Will submit a fix for this.
>> RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
>> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
>> RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
>> RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
>> R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
>> FS: 0000000000000000(0000) GS:ffff8801db200000(0063)
>> knlGS:0000000009b70840
>> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
>> ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
>> inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
>> rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
>> netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
>> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
>> netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
>> netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
>> netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
>> sock_sendmsg_nosec net/socket.c:636 [inline]
>> sock_sendmsg+0xca/0x110 net/socket.c:646
>> sock_write_iter+0x31a/0x5d0 net/socket.c:915
>> call_write_iter include/linux/fs.h:1772 [inline]
>> do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
>> do_iter_write+0x154/0x540 fs/read_write.c:932
>> compat_writev+0x225/0x420 fs/read_write.c:1246
>> do_compat_writev+0x115/0x220 fs/read_write.c:1267
>> C_SYSC_writev fs/read_write.c:1278 [inline]
>> compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
>> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
>> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
>> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
>> RIP: 0023:0xf7f1fc79
>> RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
>> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
>> RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
>> RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8
>> db a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c
>> 02 00 0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
>> RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
>> ---[ end trace 956c65133fcfff88 ]---
>>
>>
>> ---
>> This bug is generated by a dumb bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for details.
>> Direct all questions to [email protected].
>>
>> 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.
>
On Wed, Jan 03, 2018 at 10:53:02AM -0800, 'Wei Wang' via syzkaller-bugs wrote:
> On Wed, Jan 3, 2018 at 8:16 AM, David Ahern <[email protected]> wrote:
> > [ [email protected] ]
> >
> > On 1/2/18 3:58 PM, syzbot wrote:
> >> Hello,
> >>
> >> syzkaller hit the following crash on
> >> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
> >> compiler: gcc (GCC) 7.1.1 20170620
> >> .config is attached
> >> Raw console output is attached.
> >> C reproducer is attached
> >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
> >> for information about syzkaller reproducers
> >>
> >>
> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> >> Reported-by: [email protected]
> >> It will help syzbot understand when the bug is fixed. See footer for
> >> details.
> >> If you forward the report, please keep this part and the footer.
This crash seemed to stop occurring around Jan 8. Wei, next time can you please
use the suggested Reported-by line so that syzbot knows which commit is meant to
fix the bug? I assume it was this one:
#syz fix: ipv6: fix general protection fault in fib6_add()
Thanks!
- Eric
> >>
> >> audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
> >> pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299"
> >> dev="sda1" ino=16481
> >> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
> >> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
> >> IPv6: Can't replace route, no match found
> >> 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: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> >> Google 01/01/2011
> >> RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
>
> pn could be NULL if fib6_add_1() failed. Will submit a fix for this.
>
> >> RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
> >> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
> >> RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
> >> RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
> >> R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
> >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
> >> FS: 0000000000000000(0000) GS:ffff8801db200000(0063)
> >> knlGS:0000000009b70840
> >> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> >> CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
> >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> >> Call Trace:
> >> __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
> >> ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
> >> inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
> >> rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
> >> netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
> >> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
> >> netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
> >> netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
> >> netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
> >> sock_sendmsg_nosec net/socket.c:636 [inline]
> >> sock_sendmsg+0xca/0x110 net/socket.c:646
> >> sock_write_iter+0x31a/0x5d0 net/socket.c:915
> >> call_write_iter include/linux/fs.h:1772 [inline]
> >> do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
> >> do_iter_write+0x154/0x540 fs/read_write.c:932
> >> compat_writev+0x225/0x420 fs/read_write.c:1246
> >> do_compat_writev+0x115/0x220 fs/read_write.c:1267
> >> C_SYSC_writev fs/read_write.c:1278 [inline]
> >> compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
> >> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
> >> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
> >> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
> >> RIP: 0023:0xf7f1fc79
> >> RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
> >> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
> >> RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
> >> RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
> >> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> >> Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8
> >> db a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c
> >> 02 00 0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
> >> RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
> >> ---[ end trace 956c65133fcfff88 ]---
> >>
> >>
> >> ---
> >> This bug is generated by a dumb bot. It may contain errors.
> >> See https://goo.gl/tpsmEJ for details.
> >> Direct all questions to [email protected].
> >>
> >> 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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On Tue, Jan 30, 2018 at 5:16 PM, Eric Biggers <[email protected]> wrote:
> On Wed, Jan 03, 2018 at 10:53:02AM -0800, 'Wei Wang' via syzkaller-bugs wrote:
>> On Wed, Jan 3, 2018 at 8:16 AM, David Ahern <[email protected]> wrote:
>> > [ [email protected] ]
>> >
>> > On 1/2/18 3:58 PM, syzbot wrote:
>> >> Hello,
>> >>
>> >> syzkaller hit the following crash on
>> >> 61233580f1f33c50e159c50e24d80ffd2ba2e06b
>> >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
>> >> compiler: gcc (GCC) 7.1.1 20170620
>> >> .config is attached
>> >> Raw console output is attached.
>> >> C reproducer is attached
>> >> syzkaller reproducer is attached. See https://goo.gl/kgGztJ
>> >> for information about syzkaller reproducers
>> >>
>> >>
>> >> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> >> Reported-by: [email protected]
>> >> It will help syzbot understand when the bug is fixed. See footer for
>> >> details.
>> >> If you forward the report, please keep this part and the footer.
>
> This crash seemed to stop occurring around Jan 8. Wei, next time can you please
> use the suggested Reported-by line so that syzbot knows which commit is meant to
> fix the bug? I assume it was this one:
Noted. Will do.
>
> #syz fix: ipv6: fix general protection fault in fib6_add()
>
Yes. Correct.
> Thanks!
>
> - Eric
>
>> >>
>> >> audit: type=1400 audit(1514594846.496:7): avc: denied { map } for
>> >> pid=3201 comm="syzkaller001778" path="/root/syzkaller001778299"
>> >> dev="sda1" ino=16481
>> >> scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023
>> >> tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
>> >> IPv6: Can't replace route, no match found
>> >> 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: 0 PID: 3201 Comm: syzkaller001778 Not tainted 4.15.0-rc5+ #151
>> >> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> >> Google 01/01/2011
>> >> RIP: 0010:fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244
>>
>> pn could be NULL if fib6_add_1() failed. Will submit a fix for this.
>>
>> >> RSP: 0018:ffff8801c7626a70 EFLAGS: 00010202
>> >> RAX: dffffc0000000000 RBX: 0000000000000020 RCX: ffffffff84794465
>> >> RDX: 0000000000000004 RSI: ffff8801d38935f0 RDI: 0000000000000282
>> >> RBP: ffff8801c7626da0 R08: 1ffff10038ec4c35 R09: 0000000000000000
>> >> R10: ffff8801c7626c68 R11: 0000000000000000 R12: 00000000fffffffe
>> >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
>> >> FS: 0000000000000000(0000) GS:ffff8801db200000(0063)
>> >> knlGS:0000000009b70840
>> >> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>> >> CR2: 0000000020be1000 CR3: 00000001d585a006 CR4: 00000000001606f0
>> >> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> >> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> >> Call Trace:
>> >> __ip6_ins_rt+0x6c/0x90 net/ipv6/route.c:1006
>> >> ip6_route_multipath_add+0xd14/0x16c0 net/ipv6/route.c:3833
>> >> inet6_rtm_newroute+0xdc/0x160 net/ipv6/route.c:3957
>> >> rtnetlink_rcv_msg+0x733/0x1020 net/core/rtnetlink.c:4411
>> >> netlink_rcv_skb+0x21e/0x460 net/netlink/af_netlink.c:2408
>> >> rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4423
>> >> netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
>> >> netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1301
>> >> netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
>> >> sock_sendmsg_nosec net/socket.c:636 [inline]
>> >> sock_sendmsg+0xca/0x110 net/socket.c:646
>> >> sock_write_iter+0x31a/0x5d0 net/socket.c:915
>> >> call_write_iter include/linux/fs.h:1772 [inline]
>> >> do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
>> >> do_iter_write+0x154/0x540 fs/read_write.c:932
>> >> compat_writev+0x225/0x420 fs/read_write.c:1246
>> >> do_compat_writev+0x115/0x220 fs/read_write.c:1267
>> >> C_SYSC_writev fs/read_write.c:1278 [inline]
>> >> compat_SyS_writev+0x26/0x30 fs/read_write.c:1274
>> >> do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
>> >> do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
>> >> entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
>> >> RIP: 0023:0xf7f1fc79
>> >> RSP: 002b:00000000ffb61bfc EFLAGS: 00000203 ORIG_RAX: 0000000000000092
>> >> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000204aaff0
>> >> RDX: 0000000000000001 RSI: 0000000000000167 RDI: 0000000000000010
>> >> RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
>> >> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
>> >> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> >> Code: f1 a9 f6 fc e8 2c f2 e2 fc 85 c0 0f 85 d5 03 00 00 49 8d 5e 20 e8
>> >> db a9 f6 fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c
>> >> 02 00 0f 85 5a 0c 00 00 4d 39 ee 4d 8b 7e 20 0f 95 c0 4c
>> >> RIP: fib6_add+0x736/0x15a0 net/ipv6/ip6_fib.c:1244 RSP: ffff8801c7626a70
>> >> ---[ end trace 956c65133fcfff88 ]---
>> >>
>> >>
>> >> ---
>> >> This bug is generated by a dumb bot. It may contain errors.
>> >> See https://goo.gl/tpsmEJ for details.
>> >> Direct all questions to [email protected].
>> >>
>> >> 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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