* KMSAN: uninit-value in br_mdb_ip_get
@ 2019-01-28 19:13 syzbot
2019-02-21 10:56 ` Dmitry Vyukov
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-01-28 19:13 UTC (permalink / raw)
To: bridge, davem, glider, linux-kernel, netdev, nikolay, roopa,
syzkaller-bugs
Hello,
syzbot found the following crash on:
HEAD commit: 02f2d5aea531 kmsan: (presumably) fix dma_map_page_attrs()
git tree: kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=173a7310c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=52c9737ec5618f82
dashboard link: https://syzkaller.appspot.com/bug?extid=8dfe5ee27aa6d2e396c2
compiler: clang version 8.0.0 (trunk 350509)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8dfe5ee27aa6d2e396c2@syzkaller.appspotmail.com
==================================================================
BUG: KMSAN: uninit-value in __rhashtable_lookup
include/linux/rhashtable.h:505 [inline]
BUG: KMSAN: uninit-value in rhashtable_lookup
include/linux/rhashtable.h:534 [inline]
BUG: KMSAN: uninit-value in br_mdb_ip_get+0x52b/0x740
net/bridge/br_multicast.c:97
CPU: 0 PID: 11379 Comm: udevd Not tainted 5.0.0-rc1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x173/0x1d0 lib/dump_stack.c:113
kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
__msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
__rhashtable_lookup include/linux/rhashtable.h:505 [inline]
rhashtable_lookup include/linux/rhashtable.h:534 [inline]
br_mdb_ip_get+0x52b/0x740 net/bridge/br_multicast.c:97
br_multicast_new_group+0xa7/0x1640 net/bridge/br_multicast.c:467
br_multicast_add_group+0x242/0xf00 net/bridge/br_multicast.c:552
br_ip4_multicast_add_group net/bridge/br_multicast.c:606 [inline]
br_ip4_multicast_igmp3_report net/bridge/br_multicast.c:972 [inline]
br_multicast_ipv4_rcv net/bridge/br_multicast.c:1615 [inline]
br_multicast_rcv+0x3a88/0x6560 net/bridge/br_multicast.c:1701
br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
__netdev_start_xmit include/linux/netdevice.h:4382 [inline]
netdev_start_xmit include/linux/netdevice.h:4391 [inline]
xmit_one net/core/dev.c:3278 [inline]
dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
__dev_queue_xmit+0x2e48/0x3b80 net/core/dev.c:3864
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
neigh_hh_output include/net/neighbour.h:498 [inline]
neigh_output include/net/neighbour.h:506 [inline]
ip_finish_output2+0x156d/0x1820 net/ipv4/ip_output.c:229
ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip_output+0x53f/0x610 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:444 [inline]
ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
igmpv3_sendpack net/ipv4/igmp.c:417 [inline]
igmpv3_send_cr net/ipv4/igmp.c:705 [inline]
igmp_ifc_timer_expire+0x12cb/0x1aa0 net/ipv4/igmp.c:793
call_timer_fn+0x285/0x600 kernel/time/timer.c:1325
expire_timers kernel/time/timer.c:1362 [inline]
__run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681
run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694
__do_softirq+0x53f/0x93a kernel/softirq.c:293
invoke_softirq kernel/softirq.c:375 [inline]
irq_exit+0x214/0x250 kernel/softirq.c:416
exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536
smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1064
apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814
</IRQ>
RIP: 0010:__msan_chain_origin+0x93/0xe0 mm/kmsan/kmsan_instr.c:201
Code: 89 f7 e8 f0 e0 ff ff 89 c3 65 ff 0c 25 04 90 03 00 65 8b 04 25 04 90
03 00 85 c0 75 30 e8 f5 a2 3f ff 4c 89 7d d0 ff 75 d0 9d <65> 48 8b 04 25
28 00 00 00 48 3b 45 e0 75 0d 89 d8 48 83 c4 18 5b
RSP: 0018:ffff8880a53cf6f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00000000a06000af RCX: c7641d3373f0d000
RDX: 0000000000000003 RSI: 0000000000480020 RDI: 0000000085c0000c
RBP: ffff8880a53cf720 R08: 0000000000000003 R09: ffff8880a53cf4ac
R10: ffffffff8ae01788 R11: 0000000000000000 R12: ffff8880a53cfcd0
R13: ffff8880a53cfcc8 R14: 0000000085c0000c R15: 0000000000000246
step_into+0x70c/0x1b90 fs/namei.c:1778
walk_component+0x1d0/0xba0 fs/namei.c:1829
link_path_walk+0xa9e/0x2160 fs/namei.c:2135
path_openat+0x30e/0x6b90 fs/namei.c:3533
do_filp_open+0x2b8/0x710 fs/namei.c:3564
do_sys_open+0x642/0xa30 fs/open.c:1063
__do_sys_open fs/open.c:1081 [inline]
__se_sys_open+0xad/0xc0 fs/open.c:1076
__x64_sys_open+0x4a/0x70 fs/open.c:1076
do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x7f4526cc5120
Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90
90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
RSP: 002b:00007ffdb010be48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000ee2fd0 RCX: 00007f4526cc5120
RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007ffdb010bf20
RBP: 00007ffdb010bec0 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 000000000041f57a R14: 0000000000ed3250 R15: 000000000000000b
Local variable description: ----br_group.i.i@br_multicast_rcv
Variable was created at:
br_multicast_rcv+0x1e7/0x6560 net/bridge/br_multicast.c:1690
br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
==================================================================
---
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KMSAN: uninit-value in br_mdb_ip_get
2019-01-28 19:13 KMSAN: uninit-value in br_mdb_ip_get syzbot
@ 2019-02-21 10:56 ` Dmitry Vyukov
2019-05-31 11:28 ` Dmitry Vyukov
0 siblings, 1 reply; 3+ messages in thread
From: Dmitry Vyukov @ 2019-02-21 10:56 UTC (permalink / raw)
To: syzbot
Cc: bridge, David Miller, Alexander Potapenko, LKML, netdev,
Nikolay Aleksandrov, Roopa Prabhu, syzkaller-bugs, Herbert Xu
On Mon, Jan 28, 2019 at 8:13 PM syzbot
<syzbot+8dfe5ee27aa6d2e396c2@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 02f2d5aea531 kmsan: (presumably) fix dma_map_page_attrs()
> git tree: kmsan
> console output: https://syzkaller.appspot.com/x/log.txt?x=173a7310c00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=52c9737ec5618f82
> dashboard link: https://syzkaller.appspot.com/bug?extid=8dfe5ee27aa6d2e396c2
> compiler: clang version 8.0.0 (trunk 350509)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+8dfe5ee27aa6d2e396c2@syzkaller.appspotmail.com
There is also a use-after-free reported at around the same stack:
https://groups.google.com/forum/#!topic/syzkaller-bugs/8V7VqxxTEzc
The question is: can these reports be related? One is root cause of another?
> ==================================================================
> BUG: KMSAN: uninit-value in __rhashtable_lookup
> include/linux/rhashtable.h:505 [inline]
> BUG: KMSAN: uninit-value in rhashtable_lookup
> include/linux/rhashtable.h:534 [inline]
> BUG: KMSAN: uninit-value in br_mdb_ip_get+0x52b/0x740
> net/bridge/br_multicast.c:97
> CPU: 0 PID: 11379 Comm: udevd Not tainted 5.0.0-rc1+ #7
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x173/0x1d0 lib/dump_stack.c:113
> kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
> __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
> __rhashtable_lookup include/linux/rhashtable.h:505 [inline]
> rhashtable_lookup include/linux/rhashtable.h:534 [inline]
> br_mdb_ip_get+0x52b/0x740 net/bridge/br_multicast.c:97
> br_multicast_new_group+0xa7/0x1640 net/bridge/br_multicast.c:467
> br_multicast_add_group+0x242/0xf00 net/bridge/br_multicast.c:552
> br_ip4_multicast_add_group net/bridge/br_multicast.c:606 [inline]
> br_ip4_multicast_igmp3_report net/bridge/br_multicast.c:972 [inline]
> br_multicast_ipv4_rcv net/bridge/br_multicast.c:1615 [inline]
> br_multicast_rcv+0x3a88/0x6560 net/bridge/br_multicast.c:1701
> br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
> __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
> netdev_start_xmit include/linux/netdevice.h:4391 [inline]
> xmit_one net/core/dev.c:3278 [inline]
> dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
> __dev_queue_xmit+0x2e48/0x3b80 net/core/dev.c:3864
> dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
> neigh_hh_output include/net/neighbour.h:498 [inline]
> neigh_output include/net/neighbour.h:506 [inline]
> ip_finish_output2+0x156d/0x1820 net/ipv4/ip_output.c:229
> ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317
> NF_HOOK_COND include/linux/netfilter.h:278 [inline]
> ip_output+0x53f/0x610 net/ipv4/ip_output.c:405
> dst_output include/net/dst.h:444 [inline]
> ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
> igmpv3_sendpack net/ipv4/igmp.c:417 [inline]
> igmpv3_send_cr net/ipv4/igmp.c:705 [inline]
> igmp_ifc_timer_expire+0x12cb/0x1aa0 net/ipv4/igmp.c:793
> call_timer_fn+0x285/0x600 kernel/time/timer.c:1325
> expire_timers kernel/time/timer.c:1362 [inline]
> __run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681
> run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694
> __do_softirq+0x53f/0x93a kernel/softirq.c:293
> invoke_softirq kernel/softirq.c:375 [inline]
> irq_exit+0x214/0x250 kernel/softirq.c:416
> exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536
> smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1064
> apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814
> </IRQ>
> RIP: 0010:__msan_chain_origin+0x93/0xe0 mm/kmsan/kmsan_instr.c:201
> Code: 89 f7 e8 f0 e0 ff ff 89 c3 65 ff 0c 25 04 90 03 00 65 8b 04 25 04 90
> 03 00 85 c0 75 30 e8 f5 a2 3f ff 4c 89 7d d0 ff 75 d0 9d <65> 48 8b 04 25
> 28 00 00 00 48 3b 45 e0 75 0d 89 d8 48 83 c4 18 5b
> RSP: 0018:ffff8880a53cf6f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> RAX: 0000000000000000 RBX: 00000000a06000af RCX: c7641d3373f0d000
> RDX: 0000000000000003 RSI: 0000000000480020 RDI: 0000000085c0000c
> RBP: ffff8880a53cf720 R08: 0000000000000003 R09: ffff8880a53cf4ac
> R10: ffffffff8ae01788 R11: 0000000000000000 R12: ffff8880a53cfcd0
> R13: ffff8880a53cfcc8 R14: 0000000085c0000c R15: 0000000000000246
> step_into+0x70c/0x1b90 fs/namei.c:1778
> walk_component+0x1d0/0xba0 fs/namei.c:1829
> link_path_walk+0xa9e/0x2160 fs/namei.c:2135
> path_openat+0x30e/0x6b90 fs/namei.c:3533
> do_filp_open+0x2b8/0x710 fs/namei.c:3564
> do_sys_open+0x642/0xa30 fs/open.c:1063
> __do_sys_open fs/open.c:1081 [inline]
> __se_sys_open+0xad/0xc0 fs/open.c:1076
> __x64_sys_open+0x4a/0x70 fs/open.c:1076
> do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
> entry_SYSCALL_64_after_hwframe+0x63/0xe7
> RIP: 0033:0x7f4526cc5120
> Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90
> 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff
> ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
> RSP: 002b:00007ffdb010be48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> RAX: ffffffffffffffda RBX: 0000000000ee2fd0 RCX: 00007f4526cc5120
> RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007ffdb010bf20
> RBP: 00007ffdb010bec0 R08: 0000000000000008 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
> R13: 000000000041f57a R14: 0000000000ed3250 R15: 000000000000000b
>
> Local variable description: ----br_group.i.i@br_multicast_rcv
> Variable was created at:
> br_multicast_rcv+0x1e7/0x6560 net/bridge/br_multicast.c:1690
> br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
> ==================================================================
>
>
> ---
> 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.
>
> --
> 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/00000000000047d84e058089773f%40google.com.
> For more options, visit https://groups.google.com/d/optout.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: KMSAN: uninit-value in br_mdb_ip_get
2019-02-21 10:56 ` Dmitry Vyukov
@ 2019-05-31 11:28 ` Dmitry Vyukov
0 siblings, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2019-05-31 11:28 UTC (permalink / raw)
To: syzbot, Nikolay Aleksandrov
Cc: bridge, David Miller, Alexander Potapenko, LKML, netdev,
Roopa Prabhu, syzkaller-bugs, Herbert Xu
On Thu, Feb 21, 2019 at 11:56 AM Dmitry Vyukov <dvyukov@google.com> wrote:
>
> On Mon, Jan 28, 2019 at 8:13 PM syzbot
> <syzbot+8dfe5ee27aa6d2e396c2@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: 02f2d5aea531 kmsan: (presumably) fix dma_map_page_attrs()
> > git tree: kmsan
> > console output: https://syzkaller.appspot.com/x/log.txt?x=173a7310c00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=52c9737ec5618f82
> > dashboard link: https://syzkaller.appspot.com/bug?extid=8dfe5ee27aa6d2e396c2
> > compiler: clang version 8.0.0 (trunk 350509)
> >
> > Unfortunately, I don't have any reproducer for this crash yet.
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+8dfe5ee27aa6d2e396c2@syzkaller.appspotmail.com
>
>
> There is also a use-after-free reported at around the same stack:
> https://groups.google.com/forum/#!topic/syzkaller-bugs/8V7VqxxTEzc
> The question is: can these reports be related? One is root cause of another?
>
>
> > ==================================================================
> > BUG: KMSAN: uninit-value in __rhashtable_lookup
> > include/linux/rhashtable.h:505 [inline]
> > BUG: KMSAN: uninit-value in rhashtable_lookup
> > include/linux/rhashtable.h:534 [inline]
> > BUG: KMSAN: uninit-value in br_mdb_ip_get+0x52b/0x740
> > net/bridge/br_multicast.c:97
> > CPU: 0 PID: 11379 Comm: udevd Not tainted 5.0.0-rc1+ #7
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Call Trace:
> > <IRQ>
> > __dump_stack lib/dump_stack.c:77 [inline]
> > dump_stack+0x173/0x1d0 lib/dump_stack.c:113
> > kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
> > __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
> > __rhashtable_lookup include/linux/rhashtable.h:505 [inline]
> > rhashtable_lookup include/linux/rhashtable.h:534 [inline]
> > br_mdb_ip_get+0x52b/0x740 net/bridge/br_multicast.c:97
> > br_multicast_new_group+0xa7/0x1640 net/bridge/br_multicast.c:467
> > br_multicast_add_group+0x242/0xf00 net/bridge/br_multicast.c:552
> > br_ip4_multicast_add_group net/bridge/br_multicast.c:606 [inline]
> > br_ip4_multicast_igmp3_report net/bridge/br_multicast.c:972 [inline]
> > br_multicast_ipv4_rcv net/bridge/br_multicast.c:1615 [inline]
> > br_multicast_rcv+0x3a88/0x6560 net/bridge/br_multicast.c:1701
> > br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
> > __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
> > netdev_start_xmit include/linux/netdevice.h:4391 [inline]
> > xmit_one net/core/dev.c:3278 [inline]
> > dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
> > __dev_queue_xmit+0x2e48/0x3b80 net/core/dev.c:3864
> > dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
> > neigh_hh_output include/net/neighbour.h:498 [inline]
> > neigh_output include/net/neighbour.h:506 [inline]
> > ip_finish_output2+0x156d/0x1820 net/ipv4/ip_output.c:229
> > ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317
> > NF_HOOK_COND include/linux/netfilter.h:278 [inline]
> > ip_output+0x53f/0x610 net/ipv4/ip_output.c:405
> > dst_output include/net/dst.h:444 [inline]
> > ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124
> > igmpv3_sendpack net/ipv4/igmp.c:417 [inline]
> > igmpv3_send_cr net/ipv4/igmp.c:705 [inline]
> > igmp_ifc_timer_expire+0x12cb/0x1aa0 net/ipv4/igmp.c:793
> > call_timer_fn+0x285/0x600 kernel/time/timer.c:1325
> > expire_timers kernel/time/timer.c:1362 [inline]
> > __run_timers+0xdb4/0x11d0 kernel/time/timer.c:1681
> > run_timer_softirq+0x2e/0x50 kernel/time/timer.c:1694
> > __do_softirq+0x53f/0x93a kernel/softirq.c:293
> > invoke_softirq kernel/softirq.c:375 [inline]
> > irq_exit+0x214/0x250 kernel/softirq.c:416
> > exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536
> > smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1064
> > apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:814
> > </IRQ>
> > RIP: 0010:__msan_chain_origin+0x93/0xe0 mm/kmsan/kmsan_instr.c:201
> > Code: 89 f7 e8 f0 e0 ff ff 89 c3 65 ff 0c 25 04 90 03 00 65 8b 04 25 04 90
> > 03 00 85 c0 75 30 e8 f5 a2 3f ff 4c 89 7d d0 ff 75 d0 9d <65> 48 8b 04 25
> > 28 00 00 00 48 3b 45 e0 75 0d 89 d8 48 83 c4 18 5b
> > RSP: 0018:ffff8880a53cf6f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> > RAX: 0000000000000000 RBX: 00000000a06000af RCX: c7641d3373f0d000
> > RDX: 0000000000000003 RSI: 0000000000480020 RDI: 0000000085c0000c
> > RBP: ffff8880a53cf720 R08: 0000000000000003 R09: ffff8880a53cf4ac
> > R10: ffffffff8ae01788 R11: 0000000000000000 R12: ffff8880a53cfcd0
> > R13: ffff8880a53cfcc8 R14: 0000000085c0000c R15: 0000000000000246
> > step_into+0x70c/0x1b90 fs/namei.c:1778
> > walk_component+0x1d0/0xba0 fs/namei.c:1829
> > link_path_walk+0xa9e/0x2160 fs/namei.c:2135
> > path_openat+0x30e/0x6b90 fs/namei.c:3533
> > do_filp_open+0x2b8/0x710 fs/namei.c:3564
> > do_sys_open+0x642/0xa30 fs/open.c:1063
> > __do_sys_open fs/open.c:1081 [inline]
> > __se_sys_open+0xad/0xc0 fs/open.c:1076
> > __x64_sys_open+0x4a/0x70 fs/open.c:1076
> > do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
> > entry_SYSCALL_64_after_hwframe+0x63/0xe7
> > RIP: 0033:0x7f4526cc5120
> > Code: 48 8b 15 1b 4d 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90
> > 90 90 90 83 3d d5 a4 2b 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff
> > ff 73 31 c3 48 83 ec 08 e8 5e 8c 01 00 48 89 04 24
> > RSP: 002b:00007ffdb010be48 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
> > RAX: ffffffffffffffda RBX: 0000000000ee2fd0 RCX: 00007f4526cc5120
> > RDX: 00000000000001b6 RSI: 0000000000080000 RDI: 00007ffdb010bf20
> > RBP: 00007ffdb010bec0 R08: 0000000000000008 R09: 0000000000000001
> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
> > R13: 000000000041f57a R14: 0000000000ed3250 R15: 000000000000000b
> >
> > Local variable description: ----br_group.i.i@br_multicast_rcv
> > Variable was created at:
> > br_multicast_rcv+0x1e7/0x6560 net/bridge/br_multicast.c:1690
> > br_dev_xmit+0xbc5/0x16a0 net/bridge/br_device.c:93
> > ==================================================================
Nikolay seems to fix this with the following commit:
commit 1515a63fc413f160d20574ab0894e7f1020c7be2
Author: Nikolay Aleksandrov
Date: Wed Apr 3 23:27:24 2019 +0300
net: bridge: always clear mcast matching struct on reports and leaves
Let's close the bug:
#syz fix:
net: bridge: always clear mcast matching struct on reports and leaves
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2019-01-28 19:13 KMSAN: uninit-value in br_mdb_ip_get syzbot
2019-02-21 10:56 ` Dmitry Vyukov
2019-05-31 11:28 ` Dmitry Vyukov
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