divide error in netem

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	divide error in netem_enqueue	C	done	done	332	841d	1854d	0/28	closed as invalid on 2022/11/15 21:20
android-5-10	divide error in netem_enqueue				2	906d	917d	0/2	auto-closed as invalid on 2022/08/28 08:54
linux-4.19	divide error in netem_enqueue	C		error	55	672d	1457d	0/1	upstream: reported C repro on 2020/11/25 15:52
linux-4.14	divide error in netem_enqueue	C		error	32	899d	1791d	0/1	upstream: reported C repro on 2019/12/26 23:17

divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 26198 Comm: syz-executor.0 Not tainted 5.10.140-syzkaller-00825-g59390358870a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 RIP: 0010:netem_enqueue+0x29e6/0x3900 net/sched/sch_netem.c:516 Code: 45 8b 75 70 4c 89 6c 24 28 49 83 c5 74 4c 89 e9 48 c1 e9 03 8a 14 31 84 d2 48 8b 5c 24 10 0f 85 32 08 00 00 45 2b 75 00 31 d2 <41> f7 f6 49 01 d4 4c 89 e0 48 c1 e8 03 8a 04 30 84 c0 0f 85 45 08 RSP: 0018:ffffc900062cf280 EFLAGS: 00010246 RAX: 000000008d289fa4 RBX: ffff88810fb7b800 RCX: 1ffff11021932686 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88810c993430 RBP: ffffc900062cf3b0 R08: ffffffff824a5832 R09: 0000000000000003 R10: fffff52000c59db5 R11: 1ffff92000c59db4 R12: ffff88811779d080 R13: ffff88810c993434 R14: 0000000000000000 R15: 0000000000000020 FS: 00007f8b6cd83700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000010ff1a000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: netem_enqueue+0x12cb/0x3900 net/sched/sch_netem.c:483 __dev_xmit_skb net/core/dev.c:3827 [inline] __dev_queue_xmit+0xd71/0x2a20 net/core/dev.c:4140 dev_queue_xmit+0x17/0x20 net/core/dev.c:4208 packet_snd net/packet/af_packet.c:3022 [inline] packet_sendmsg+0x4cfc/0x6880 net/packet/af_packet.c:3054 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2343 ___sys_sendmsg net/socket.c:2397 [inline] __sys_sendmsg+0x37b/0x460 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2437 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7f8b6dc0d409 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b6cd83168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f8b6dd1ff80 RCX: 00007f8b6dc0d409 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007f8b6dc68367 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdca3caf2f R14: 00007f8b6cd83300 R15: 0000000000022000 Modules linked in: ---[ end trace 115618bc7d405e35 ]--- RIP: 0010:netem_enqueue+0x29e6/0x3900 net/sched/sch_netem.c:516 Code: 45 8b 75 70 4c 89 6c 24 28 49 83 c5 74 4c 89 e9 48 c1 e9 03 8a 14 31 84 d2 48 8b 5c 24 10 0f 85 32 08 00 00 45 2b 75 00 31 d2 <41> f7 f6 49 01 d4 4c 89 e0 48 c1 e8 03 8a 04 30 84 c0 0f 85 45 08 RSP: 0018:ffffc900062cf280 EFLAGS: 00010246 RAX: 000000008d289fa4 RBX: ffff88810fb7b800 RCX: 1ffff11021932686 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88810c993430 RBP: ffffc900062cf3b0 R08: ffffffff824a5832 R09: 0000000000000003 R10: fffff52000c59db5 R11: 1ffff92000c59db4 R12: ffff88811779d080 R13: ffff88810c993434 R14: 0000000000000000 R15: 0000000000000020 FS: 00007f8b6cd83700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000010ff1a000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 45 8b 75 70 mov 0x70(%r13),%r14d 4: 4c 89 6c 24 28 mov %r13,0x28(%rsp) 9: 49 83 c5 74 add $0x74,%r13 d: 4c 89 e9 mov %r13,%rcx 10: 48 c1 e9 03 shr $0x3,%rcx 14: 8a 14 31 mov (%rcx,%rsi,1),%dl 17: 84 d2 test %dl,%dl 19: 48 8b 5c 24 10 mov 0x10(%rsp),%rbx 1e: 0f 85 32 08 00 00 jne 0x856 24: 45 2b 75 00 sub 0x0(%r13),%r14d 28: 31 d2 xor %edx,%edx * 2a: 41 f7 f6 div %r14d <-- trapping instruction 2d: 49 01 d4 add %rdx,%r12 30: 4c 89 e0 mov %r12,%rax 33: 48 c1 e8 03 shr $0x3,%rax 37: 8a 04 30 mov (%rax,%rsi,1),%al 3a: 84 c0 test %al,%al 3c: 0f .byte 0xf 3d: 85 45 08 test %eax,0x8(%rbp)