divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 309 Comm: syz-executor121 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:netem_enqueue+0x17f8/0x3750 net/sched/sch_netem.c:511 Code: 00 4c 89 e9 45 8b 6d 70 48 89 4c 24 28 4c 8d 61 74 4c 89 e1 48 c1 e9 03 0f b6 0c 31 84 c9 0f 85 34 19 00 00 45 2b 2c 24 31 d2 <41> f7 f5 48 01 d3 48 89 d8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85 45 RSP: 0018:ffffc90000a573e0 EFLAGS: 00010246 RAX: 00000000fc1fc2f4 RBX: ffff88810f5ae880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88810d7c7570 RBP: ffffc90000a57510 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200014ade4 R12: ffff88810d7c7574 R13: 0000000000000000 R14: 0000000000000080 R15: 0000000000000000 FS: 00005555752c53c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010c95c000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: netem_enqueue+0x1928/0x3750 net/sched/sch_netem.c:534 dev_qdisc_enqueue net/core/dev.c:3873 [inline] __dev_xmit_skb net/core/dev.c:3957 [inline] __dev_queue_xmit+0xc35/0x2d60 net/core/dev.c:4274 dev_queue_xmit+0x17/0x20 net/core/dev.c:4355 tpacket_snd net/packet/af_packet.c:2897 [inline] packet_sendmsg+0x224d/0x5060 net/packet/af_packet.c:3123 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1080 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x831/0xfd0 fs/read_write.c:594 ksys_write+0x14a/0x260 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:656 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0dbd304a89 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 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 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdaa013098 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0dbd304a89 RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffdaa0130e0 Modules linked in: ---[ end trace 5558f3f345470bd9 ]--- RIP: 0010:netem_enqueue+0x17f8/0x3750 net/sched/sch_netem.c:511 Code: 00 4c 89 e9 45 8b 6d 70 48 89 4c 24 28 4c 8d 61 74 4c 89 e1 48 c1 e9 03 0f b6 0c 31 84 c9 0f 85 34 19 00 00 45 2b 2c 24 31 d2 <41> f7 f5 48 01 d3 48 89 d8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85 45 RSP: 0018:ffffc90000a573e0 EFLAGS: 00010246 RAX: 00000000fc1fc2f4 RBX: ffff88810f5ae880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: dffffc0000000000 RDI: ffff88810d7c7570 RBP: ffffc90000a57510 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200014ade4 R12: ffff88810d7c7574 R13: 0000000000000000 R14: 0000000000000080 R15: 0000000000000000 FS: 00005555752c53c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010c95c000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 4c 89 e9 add %cl,-0x17(%rcx,%rcx,4) 4: 45 8b 6d 70 mov 0x70(%r13),%r13d 8: 48 89 4c 24 28 mov %rcx,0x28(%rsp) d: 4c 8d 61 74 lea 0x74(%rcx),%r12 11: 4c 89 e1 mov %r12,%rcx 14: 48 c1 e9 03 shr $0x3,%rcx 18: 0f b6 0c 31 movzbl (%rcx,%rsi,1),%ecx 1c: 84 c9 test %cl,%cl 1e: 0f 85 34 19 00 00 jne 0x1958 24: 45 2b 2c 24 sub (%r12),%r13d 28: 31 d2 xor %edx,%edx * 2a: 41 f7 f5 div %r13d <-- trapping instruction 2d: 48 01 d3 add %rdx,%rbx 30: 48 89 d8 mov %rbx,%rax 33: 48 c1 e8 03 shr $0x3,%rax 37: 0f b6 04 30 movzbl (%rax,%rsi,1),%eax 3b: 84 c0 test %al,%al 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: 45 rex.RB