bisecting fixing commit since f116b96685a046a89c25d4a6ba2da489145c8888
building syzkaller on d01bb02a96019cda0fa8c46e5c6d5eb66a273f17
testing commit f116b96685a046a89c25d4a6ba2da489145c8888 with gcc (GCC) 8.1.0
kernel signature: 3492f56fdf483b3a02cdda93d3c23e825e6f59d1154adf90afa757696cdd2a86
all runs: crashed: divide error in tabledist
testing current HEAD fdfa3a6778b194974df77b384cc71eb2e503639a
testing commit fdfa3a6778b194974df77b384cc71eb2e503639a with gcc (GCC) 8.1.0
kernel signature: 043143feb8eaed858a5b4e27e84f28b410cf0f391252c1a93869efdeb96d529c
all runs: crashed: divide error in tabledist
revisions tested: 2, total time: 19m32.99625972s (build: 12m7.263291536s, test: 6m38.034268162s)
the crash still happens on HEAD
commit msg: Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
crash: divide error in tabledist
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 2789 Comm: kworker/1:151 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:tabledist.part.20+0x10b/0x150 net/sched/sch_netem.c:333
Code: 3c 18 49 8d 80 ff 1f 00 00 49 0f 49 c0 48 83 c4 08 5b 48 c1 f8 0d 41 5c 48 01 f8 41 5d 5d c3 43 8d 4c 2d 00 31 d2 48 83 c4 08 <f7> f1 49 63 c5 48 29 c3 48 8d 04 1a 5b 41 5c 41 5d 5d c3 4c 89 e7
RSP: 0018:ffff8880a0546d28 EFLAGS: 00010286
RAX: 000000000f82256b RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffffff8a23e7a0
RBP: ffff8880a0546d40 R08: 0000000000000001 R09: ffff8880801c6840
R10: ffffed101003822e R11: ffff8880801c1177 R12: 0000000000000000
R13: 0000000080000000 R14: ffff8880801c1000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 00000000a4b12000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 tabledist net/sched/sch_netem.c:536 [inline]
 netem_enqueue+0xdae/0x2f40 net/sched/sch_netem.c:536
 __dev_xmit_skb net/core/dev.c:3721 [inline]
 __dev_queue_xmit+0x103e/0x2e80 net/core/dev.c:4032
 dev_queue_xmit+0xb/0x10 net/core/dev.c:4096
 br_dev_queue_push_xmit+0x14b/0x560 net/bridge/br_forward.c:52
 NF_HOOK include/linux/netfilter.h:307 [inline]
 br_forward_finish+0xdd/0x2f0 net/bridge/br_forward.c:65
 NF_HOOK include/linux/netfilter.h:307 [inline]
 __br_forward+0x4c6/0x890 net/bridge/br_forward.c:109
 deliver_clone+0x54/0xa0 net/bridge/br_forward.c:125
 maybe_deliver+0x205/0x2f0 net/bridge/br_forward.c:181
 br_flood+0x170/0x2f0 net/bridge/br_forward.c:223
 br_dev_xmit+0xabf/0x11f0 net/bridge/br_device.c:99
 __netdev_start_xmit include/linux/netdevice.h:4510 [inline]
 netdev_start_xmit include/linux/netdevice.h:4524 [inline]
 xmit_one net/core/dev.c:3470 [inline]
 dev_hard_start_xmit+0x16a/0x780 net/core/dev.c:3486
 __dev_queue_xmit+0x1f69/0x2e80 net/core/dev.c:4063
 dev_queue_xmit+0xb/0x10 net/core/dev.c:4096
 neigh_resolve_output+0x494/0x800 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:510 [inline]
 ip6_finish_output2+0xcc4/0x2340 net/ipv6/ip6_output.c:116
 __ip6_finish_output+0x36c/0x930 net/ipv6/ip6_output.c:142
 ip6_finish_output+0x27/0x170 net/ipv6/ip6_output.c:152
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x1e4/0x750 net/ipv6/ip6_output.c:175
 dst_output include/net/dst.h:436 [inline]
 NF_HOOK include/linux/netfilter.h:307 [inline]
 ndisc_send_skb+0xcac/0x12a0 net/ipv6/ndisc.c:505
 ndisc_send_ns+0x2cb/0x7e0 net/ipv6/ndisc.c:647
 addrconf_dad_work+0xa3e/0xff0 net/ipv6/addrconf.c:4120
 process_one_work+0x88b/0x1680 kernel/workqueue.c:2264
 worker_thread+0x85/0xb60 kernel/workqueue.c:2410
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 8e8b46fc9b655d89 ]---
RIP: 0010:tabledist.part.20+0x10b/0x150 net/sched/sch_netem.c:333
Code: 3c 18 49 8d 80 ff 1f 00 00 49 0f 49 c0 48 83 c4 08 5b 48 c1 f8 0d 41 5c 48 01 f8 41 5d 5d c3 43 8d 4c 2d 00 31 d2 48 83 c4 08 <f7> f1 49 63 c5 48 29 c3 48 8d 04 1a 5b 41 5c 41 5d 5d c3 4c 89 e7
RSP: 0018:ffff8880a0546d28 EFLAGS: 00010286
RAX: 000000000f82256b RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000080000000 RDI: ffffffff8a23e7a0
RBP: ffff8880a0546d40 R08: 0000000000000001 R09: ffff8880801c6840
R10: ffffed101003822e R11: ffff8880801c1177 R12: 0000000000000000
R13: 0000000080000000 R14: ffff8880801c1000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000075c000 CR3: 000000000866d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400