UBSAN: undefined-behaviour in tabledist
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syzbot
Oct 8, 2020, 11:40:18 PM10/8/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16a14dbf900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d48cfc...@syzkaller.appspotmail.com
FAT-fs (loop3): Unrecognized mount option "time_nffset=0hff�4U� �Xz��? i�%K��L" or missing value
ptrace attach of "/root/syz-executor.5"[26761] was attempted by "/root/syz-executor.5"[26766]
================================================================================
UBSAN: Undefined behaviour in net/sched/sch_netem.c:333:16
division by zero
CPU: 1 PID: 6438 Comm: kworker/u4:5 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_divrem_overflow.cold+0xa4/0xcf lib/ubsan.c:257
tabledist.part.0.cold+0x16/0x1b net/sched/sch_netem.c:333
tabledist net/sched/sch_netem.c:534 [inline]
netem_enqueue+0x45e/0x318a net/sched/sch_netem.c:534
__dev_xmit_skb net/core/dev.c:3494 [inline]
__dev_queue_xmit+0x14e1/0x2ec0 net/core/dev.c:3807
neigh_resolve_output+0x55a/0x950 net/core/neighbour.c:1374
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0x1184/0x2370 net/ipv6/ip6_output.c:120
ip6_finish_output+0x610/0xcc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x205/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:455 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
mld_sendpack+0x6c1/0x1120 net/ipv6/mcast.c:1684
mld_send_cr net/ipv6/mcast.c:1980 [inline]
mld_ifc_timer_expire+0x616/0xc00 net/ipv6/mcast.c:2479
call_timer_fn+0x177/0x760 kernel/time/timer.c:1338
expire_timers+0x243/0x500 kernel/time/timer.c:1375
__run_timers kernel/time/timer.c:1703 [inline]
run_timer_softirq+0x259/0x730 kernel/time/timer.c:1716
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3910
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 dd 01 00 00 48 83 3d 09 8e 0b 08 00 0f 84 4e 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff88808aadfbf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff8880a3c364c0 RCX: 00000000ea9a094e
RDX: dffffc0000000000 RSI: ffff8880a3c36d48 RDI: 0000000000000286
RBP: ffffffff89735220 R08: 000000001e758529 R09: 0000000000000000
R10: 0000000000000050 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:627 [inline]
batadv_nc_process_nc_paths.part.0+0xec/0x410 net/batman-adv/network-coding.c:698
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:690 [inline]
batadv_nc_worker+0x9f4/0xd90 net/batman-adv/network-coding.c:739
process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
================================================================================
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6438 Comm: kworker/u4:5 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 00000000155a2f4c RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff88809fd587ac R14: 00000000155a2f4c R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32321000 CR3: 0000000099b60000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
tabledist net/sched/sch_netem.c:534 [inline]
netem_enqueue+0x45e/0x318a net/sched/sch_netem.c:534
__dev_xmit_skb net/core/dev.c:3494 [inline]
__dev_queue_xmit+0x14e1/0x2ec0 net/core/dev.c:3807
neigh_resolve_output+0x55a/0x950 net/core/neighbour.c:1374
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0x1184/0x2370 net/ipv6/ip6_output.c:120
ip6_finish_output+0x610/0xcc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x205/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:455 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
mld_sendpack+0x6c1/0x1120 net/ipv6/mcast.c:1684
mld_send_cr net/ipv6/mcast.c:1980 [inline]
mld_ifc_timer_expire+0x616/0xc00 net/ipv6/mcast.c:2479
call_timer_fn+0x177/0x760 kernel/time/timer.c:1338
expire_timers+0x243/0x500 kernel/time/timer.c:1375
__run_timers kernel/time/timer.c:1703 [inline]
run_timer_softirq+0x259/0x730 kernel/time/timer.c:1716
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3910
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 dd 01 00 00 48 83 3d 09 8e 0b 08 00 0f 84 4e 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff88808aadfbf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff8880a3c364c0 RCX: 00000000ea9a094e
RDX: dffffc0000000000 RSI: ffff8880a3c36d48 RDI: 0000000000000286
RBP: ffffffff89735220 R08: 000000001e758529 R09: 0000000000000000
R10: 0000000000000050 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:627 [inline]
batadv_nc_process_nc_paths.part.0+0xec/0x410 net/batman-adv/network-coding.c:698
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:690 [inline]
batadv_nc_worker+0x9f4/0xd90 net/batman-adv/network-coding.c:739
process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace a17d2da8c6c9575f ]---
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 00000000155a2f4c RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff88809fd587ac R14: 00000000155a2f4c R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32321000 CR3: 0000000099b60000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This report 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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16a14dbf900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d48cfc...@syzkaller.appspotmail.com
FAT-fs (loop3): Unrecognized mount option "time_nffset=0hff�4U� �Xz��? i�%K��L" or missing value
ptrace attach of "/root/syz-executor.5"[26761] was attempted by "/root/syz-executor.5"[26766]
================================================================================
UBSAN: Undefined behaviour in net/sched/sch_netem.c:333:16
division by zero
CPU: 1 PID: 6438 Comm: kworker/u4:5 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x22c/0x33e lib/dump_stack.c:118
ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
__ubsan_handle_divrem_overflow.cold+0xa4/0xcf lib/ubsan.c:257
tabledist.part.0.cold+0x16/0x1b net/sched/sch_netem.c:333
tabledist net/sched/sch_netem.c:534 [inline]
netem_enqueue+0x45e/0x318a net/sched/sch_netem.c:534
__dev_xmit_skb net/core/dev.c:3494 [inline]
__dev_queue_xmit+0x14e1/0x2ec0 net/core/dev.c:3807
neigh_resolve_output+0x55a/0x950 net/core/neighbour.c:1374
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0x1184/0x2370 net/ipv6/ip6_output.c:120
ip6_finish_output+0x610/0xcc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x205/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:455 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
mld_sendpack+0x6c1/0x1120 net/ipv6/mcast.c:1684
mld_send_cr net/ipv6/mcast.c:1980 [inline]
mld_ifc_timer_expire+0x616/0xc00 net/ipv6/mcast.c:2479
call_timer_fn+0x177/0x760 kernel/time/timer.c:1338
expire_timers+0x243/0x500 kernel/time/timer.c:1375
__run_timers kernel/time/timer.c:1703 [inline]
run_timer_softirq+0x259/0x730 kernel/time/timer.c:1716
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3910
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 dd 01 00 00 48 83 3d 09 8e 0b 08 00 0f 84 4e 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff88808aadfbf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff8880a3c364c0 RCX: 00000000ea9a094e
RDX: dffffc0000000000 RSI: ffff8880a3c36d48 RDI: 0000000000000286
RBP: ffffffff89735220 R08: 000000001e758529 R09: 0000000000000000
R10: 0000000000000050 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:627 [inline]
batadv_nc_process_nc_paths.part.0+0xec/0x410 net/batman-adv/network-coding.c:698
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:690 [inline]
batadv_nc_worker+0x9f4/0xd90 net/batman-adv/network-coding.c:739
process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
================================================================================
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6438 Comm: kworker/u4:5 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 00000000155a2f4c RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff88809fd587ac R14: 00000000155a2f4c R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32321000 CR3: 0000000099b60000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
tabledist net/sched/sch_netem.c:534 [inline]
netem_enqueue+0x45e/0x318a net/sched/sch_netem.c:534
__dev_xmit_skb net/core/dev.c:3494 [inline]
__dev_queue_xmit+0x14e1/0x2ec0 net/core/dev.c:3807
neigh_resolve_output+0x55a/0x950 net/core/neighbour.c:1374
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0x1184/0x2370 net/ipv6/ip6_output.c:120
ip6_finish_output+0x610/0xcc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x205/0x7c0 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:455 [inline]
NF_HOOK include/linux/netfilter.h:289 [inline]
mld_sendpack+0x6c1/0x1120 net/ipv6/mcast.c:1684
mld_send_cr net/ipv6/mcast.c:1980 [inline]
mld_ifc_timer_expire+0x616/0xc00 net/ipv6/mcast.c:2479
call_timer_fn+0x177/0x760 kernel/time/timer.c:1338
expire_timers+0x243/0x500 kernel/time/timer.c:1375
__run_timers kernel/time/timer.c:1703 [inline]
run_timer_softirq+0x259/0x730 kernel/time/timer.c:1716
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:3910
Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 dd 01 00 00 48 83 3d 09 8e 0b 08 00 0f 84 4e 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b
RSP: 0018:ffff88808aadfbf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12c713d RBX: ffff8880a3c364c0 RCX: 00000000ea9a094e
RDX: dffffc0000000000 RSI: ffff8880a3c36d48 RDI: 0000000000000286
RBP: ffffffff89735220 R08: 000000001e758529 R09: 0000000000000000
R10: 0000000000000050 R11: 0000000000000002 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:627 [inline]
batadv_nc_process_nc_paths.part.0+0xec/0x410 net/batman-adv/network-coding.c:698
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:690 [inline]
batadv_nc_worker+0x9f4/0xd90 net/batman-adv/network-coding.c:739
process_one_work+0x796/0x14e0 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Modules linked in:
---[ end trace a17d2da8c6c9575f ]---
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 00000000155a2f4c RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff88809fd587ac R14: 00000000155a2f4c R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32321000 CR3: 0000000099b60000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This report 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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Oct 9, 2020, 12:39:18 AM10/9/20
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15047a9f900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155a0920500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d48cfc...@syzkaller.appspotmail.com
netlink: 12 bytes leftover after parsing attributes in process `syz-executor289'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor289'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor289'.
RIP: 0010:console_unlock+0xd82/0x1080 kernel/printk/printk.c:2468
Code: 89 48 c1 e8 03 42 80 3c 38 00 0f 85 e9 02 00 00 48 83 3d 08 79 08 08 00 0f 84 ce 00 00 00 e8 75 c1 16 00 48 8b 7c 24 18 57 9d <0f> 1f 44 00 00 e9 fb fc ff ff e8 5f c1 16 00 0f 0b 48 c7 c7 00 16
RSP: 0018:ffff8880a3f4eec8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a47c2140 RBX: 0000000000000200 RCX: 1ffff110148f8542
RDX: 0000000000000000 RSI: ffffffff815b10eb RDI: 0000000000000293
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000061
R13: ffffffff84ae3b60 R14: ffffffff8a6eec10 R15: dffffc0000000000
vprintk_emit+0x2b8/0x7c0 kernel/printk/printk.c:1965
vprintk_func+0x77/0x224 kernel/printk/printk_safe.c:397
printk+0xba/0xed kernel/printk/printk.c:2040
nla_parse.cold+0x26/0x37 lib/nlattr.c:267
nla_parse_nested include/net/netlink.h:765 [inline]
rtnl_newlink+0x3a3/0x15b0 net/core/rtnetlink.c:2987
rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc7/0x130 net/socket.c:632
___sys_sendmsg+0x7bb/0x8f0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441e19
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd142df2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441e19
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000402ba0 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000715880(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
RIP: 0010:console_unlock+0xd82/0x1080 kernel/printk/printk.c:2468
Code: 89 48 c1 e8 03 42 80 3c 38 00 0f 85 e9 02 00 00 48 83 3d 08 79 08 08 00 0f 84 ce 00 00 00 e8 75 c1 16 00 48 8b 7c 24 18 57 9d <0f> 1f 44 00 00 e9 fb fc ff ff e8 5f c1 16 00 0f 0b 48 c7 c7 00 16
RSP: 0018:ffff8880a3f4eec8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a47c2140 RBX: 0000000000000200 RCX: 1ffff110148f8542
RDX: 0000000000000000 RSI: ffffffff815b10eb RDI: 0000000000000293
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000061
R13: ffffffff84ae3b60 R14: ffffffff8a6eec10 R15: dffffc0000000000
vprintk_emit+0x2b8/0x7c0 kernel/printk/printk.c:1965
vprintk_func+0x77/0x224 kernel/printk/printk_safe.c:397
printk+0xba/0xed kernel/printk/printk.c:2040
nla_parse.cold+0x26/0x37 lib/nlattr.c:267
nla_parse_nested include/net/netlink.h:765 [inline]
rtnl_newlink+0x3a3/0x15b0 net/core/rtnetlink.c:2987
rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc7/0x130 net/socket.c:632
___sys_sendmsg+0x7bb/0x8f0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441e19
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd142df2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441e19
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000402ba0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e3bbdaadbbdd9162 ]---
FS: 0000000000715880(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135f874f900000
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
compiler: gcc (GCC) 10.1.0-syz 20200507
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155a0920500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d48cfc...@syzkaller.appspotmail.com
netlink: 12 bytes leftover after parsing attributes in process `syz-executor289'.
netlink: 12 bytes leftover after parsing attributes in process `syz-executor289'.
================================================================================
UBSAN: Undefined behaviour in net/sched/sch_netem.c:333:16
division by zero
CPU: 1 PID: 6515 Comm: syz-executor289 Not tainted 4.19.150-syzkaller #0
UBSAN: Undefined behaviour in net/sched/sch_netem.c:333:16
division by zero
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Code: 89 48 c1 e8 03 42 80 3c 38 00 0f 85 e9 02 00 00 48 83 3d 08 79 08 08 00 0f 84 ce 00 00 00 e8 75 c1 16 00 48 8b 7c 24 18 57 9d <0f> 1f 44 00 00 e9 fb fc ff ff e8 5f c1 16 00 0f 0b 48 c7 c7 00 16
RSP: 0018:ffff8880a3f4eec8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a47c2140 RBX: 0000000000000200 RCX: 1ffff110148f8542
RDX: 0000000000000000 RSI: ffffffff815b10eb RDI: 0000000000000293
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000061
R13: ffffffff84ae3b60 R14: ffffffff8a6eec10 R15: dffffc0000000000
vprintk_emit+0x2b8/0x7c0 kernel/printk/printk.c:1965
vprintk_func+0x77/0x224 kernel/printk/printk_safe.c:397
printk+0xba/0xed kernel/printk/printk.c:2040
nla_parse.cold+0x26/0x37 lib/nlattr.c:267
nla_parse_nested include/net/netlink.h:765 [inline]
rtnl_newlink+0x3a3/0x15b0 net/core/rtnetlink.c:2987
rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc7/0x130 net/socket.c:632
___sys_sendmsg+0x7bb/0x8f0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441e19
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd142df2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441e19
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000402ba0 R14: 0000000000000000 R15: 0000000000000000
================================================================================
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6515 Comm: syz-executor289 Not tainted 4.19.150-syzkaller #0
divide error: 0000 [#1] PREEMPT SMP KASAN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 0000000099732b17 RBX: 0000000000000000 RCX: 0000000000000000
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff8880a3e850ac R14: 0000000099732b17 R15: 0000000000000000
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
FS: 0000000000715880(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000009e9af000 CR4: 00000000001406e0
Code: 89 48 c1 e8 03 42 80 3c 38 00 0f 85 e9 02 00 00 48 83 3d 08 79 08 08 00 0f 84 ce 00 00 00 e8 75 c1 16 00 48 8b 7c 24 18 57 9d <0f> 1f 44 00 00 e9 fb fc ff ff e8 5f c1 16 00 0f 0b 48 c7 c7 00 16
RSP: 0018:ffff8880a3f4eec8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a47c2140 RBX: 0000000000000200 RCX: 1ffff110148f8542
RDX: 0000000000000000 RSI: ffffffff815b10eb RDI: 0000000000000293
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000061
R13: ffffffff84ae3b60 R14: ffffffff8a6eec10 R15: dffffc0000000000
vprintk_emit+0x2b8/0x7c0 kernel/printk/printk.c:1965
vprintk_func+0x77/0x224 kernel/printk/printk_safe.c:397
printk+0xba/0xed kernel/printk/printk.c:2040
nla_parse.cold+0x26/0x37 lib/nlattr.c:267
nla_parse_nested include/net/netlink.h:765 [inline]
rtnl_newlink+0x3a3/0x15b0 net/core/rtnetlink.c:2987
rtnetlink_rcv_msg+0x498/0xc10 net/core/rtnetlink.c:4778
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc7/0x130 net/socket.c:632
___sys_sendmsg+0x7bb/0x8f0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441e19
Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd142df2a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441e19
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000402ba0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e3bbdaadbbdd9162 ]---
RIP: 0010:tabledist.part.0+0x25f/0x320 net/sched/sch_netem.c:333
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RAX: 0000000099732b17 RBX: 0000000000000000 RCX: 0000000000000000
Code: fe ff ff e8 53 6b 36 fb 8d 5c 2d 00 31 ff 89 de e8 b6 6c 36 fb 85 db 0f 84 c9 44 00 00 e8 39 6b 36 fb 44 89 f0 31 d2 49 29 ec <f7> f3 49 01 d4 e9 15 ff ff ff e8 22 6b 36 fb 48 81 eb 00 10 00 00
RSP: 0018:ffff8880ae307518 EFLAGS: 00010207
RDX: 0000000000000000 RSI: ffffffff863b6727 RDI: 0000000000000001
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
R13: ffff8880a3e850ac R14: 0000000099732b17 R15: 0000000000000000
RBP: ffffffff80000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000080000000
FS: 0000000000715880(0000) GS:ffff8880ae300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000009e9af000 CR4: 00000000001406e0
syzbot
Nov 8, 2020, 2:38:06 AM11/8/20
to syzkaller...@googlegroups.com
syzbot suspects this issue was fixed by commit:
commit 95ba2236b8e69de3cb9b12e1cd6c4252a1574a19
Author: Aleksandr Nogikh <nog...@google.com>
Date: Wed Oct 28 17:07:31 2020 +0000
netem: fix zero division in tabledist
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1015bb46500000
start commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
#syz fix: netem: fix zero division in tabledist
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 95ba2236b8e69de3cb9b12e1cd6c4252a1574a19
Author: Aleksandr Nogikh <nog...@google.com>
Date: Wed Oct 28 17:07:31 2020 +0000
netem: fix zero division in tabledist
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1015bb46500000
start commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
dashboard link: https://syzkaller.appspot.com/bug?extid=d48cfc7f5529f4bcc2ee
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135f874f900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155a0920500000
If the result looks correct, please mark the issue as fixed by replying with:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155a0920500000
#syz fix: netem: fix zero division in tabledist
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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