divide error in taprio_update_queue_max

Title	Replies (including bot)	Last reply
[syzbot] [net?] divide error in taprio_update_queue_max_sdu (2)	0 (1)	2025/06/06 18:07

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	divide error in taprio_update_queue_max_sdu net				1	381d	377d	0/28	auto-obsoleted due to no activity on 2024/08/31 12:01

upstream

divide error in taprio_update_queue_max_sdu net

381d

377d

0/28

auto-obsoleted due to no activity on 2024/08/31 12:01

Oops: divide error: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 12175 Comm: syz.3.1468 Not tainted 6.15.0-syzkaller-12422-g2c7e4a2663a1 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:130 [inline] RIP: 0010:duration_to_length net/sched/sch_taprio.c:259 [inline] RIP: 0010:taprio_update_queue_max_sdu+0x2b9/0x890 net/sched/sch_taprio.c:288 Code: 74 08 48 89 df e8 37 36 9e f8 48 8b 03 89 c1 4c 89 e8 48 c1 e8 20 74 0d 4c 89 e8 31 d2 48 f7 f1 48 89 c5 eb 09 44 89 e8 31 d2 <f7> f1 89 c5 48 83 7c 24 50 00 49 bd 00 00 00 00 00 fc ff df 74 48 RSP: 0018:ffffc90003486978 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880292be2e0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880292be2e0 RBP: 0000000000000000 R08: ffff8880292be2e7 R09: 1ffff11005257c5c R10: dffffc0000000000 R11: ffffed1005257c5d R12: 00000000ffffffff R13: 0000000000000000 R14: 0000000000000000 R15: ffff888057048c00 FS: 00007fc8a83a76c0(0000) GS:ffff888125c55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000029c28000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> taprio_dev_notifier+0x2a4/0x3b0 net/sched/sch_taprio.c:1333 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 netif_state_change+0x284/0x3a0 net/core/dev.c:1584 netif_set_operstate net/core/rtnetlink.c:1055 [inline] set_operstate+0x2cc/0x3a0 net/core/rtnetlink.c:1083 do_setlink+0x12bc/0x41c0 net/core/rtnetlink.c:3216 rtnl_group_changelink net/core/rtnetlink.c:3773 [inline] __rtnl_newlink net/core/rtnetlink.c:3927 [inline] rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6944 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 ____sys_sendmsg+0x505/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2655 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc8a758e929 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc8a83a7038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc8a77b5fa0 RCX: 00007fc8a758e929 RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000000000000004 RBP: 00007fc8a7610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc8a77b5fa0 R15: 00007ffe00d939a8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:div_u64_rem include/linux/math64.h:29 [inline] RIP: 0010:div_u64 include/linux/math64.h:130 [inline] RIP: 0010:duration_to_length net/sched/sch_taprio.c:259 [inline] RIP: 0010:taprio_update_queue_max_sdu+0x2b9/0x890 net/sched/sch_taprio.c:288 Code: 74 08 48 89 df e8 37 36 9e f8 48 8b 03 89 c1 4c 89 e8 48 c1 e8 20 74 0d 4c 89 e8 31 d2 48 f7 f1 48 89 c5 eb 09 44 89 e8 31 d2 <f7> f1 89 c5 48 83 7c 24 50 00 49 bd 00 00 00 00 00 fc ff df 74 48 RSP: 0018:ffffc90003486978 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8880292be2e0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880292be2e0 RBP: 0000000000000000 R08: ffff8880292be2e7 R09: 1ffff11005257c5c R10: dffffc0000000000 R11: ffffed1005257c5d R12: 00000000ffffffff R13: 0000000000000000 R14: 0000000000000000 R15: ffff888057048c00 FS: 00007fc8a83a76c0(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000008000 CR3: 0000000029c28000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 74 08 je 0xa 2: 48 89 df mov %rbx,%rdi 5: e8 37 36 9e f8 call 0xf89e3641 a: 48 8b 03 mov (%rbx),%rax d: 89 c1 mov %eax,%ecx f: 4c 89 e8 mov %r13,%rax 12: 48 c1 e8 20 shr $0x20,%rax 16: 74 0d je 0x25 18: 4c 89 e8 mov %r13,%rax 1b: 31 d2 xor %edx,%edx 1d: 48 f7 f1 div %rcx 20: 48 89 c5 mov %rax,%rbp 23: eb 09 jmp 0x2e 25: 44 89 e8 mov %r13d,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 f1 div %ecx <-- trapping instruction 2c: 89 c5 mov %eax,%ebp 2e: 48 83 7c 24 50 00 cmpq $0x0,0x50(%rsp) 34: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 3b: fc ff df 3e: 74 48 je 0x88

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/06/06 09:49	net-next	2c7e4a2663a1	6b6b5f21	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-net-kasan-gce	divide error in taprio_update_queue_max_sdu

Crashes (1):

Assets (help?)