RBP: 00007f8713f81f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8714154038 R14: 00007f8714153fa0 R15: 00007ffe6e1095f8
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.0.1341:5699]
Modules linked in:
CPU: 0 PID: 5699 Comm: syz.0.1341 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:qdisc_lookup+0x4a/0x4e0 net/sched/sch_api.c:304
Code: fd 85 db 0f 84 dc 00 00 00 49 bd 00 00 00 00 00 fc ff df 4c 89 75 d0 49 81 c6 d0 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 dc 9a d4 fd 4d 8b 36 4d 8d 66 40 4c 89 e0 48 c1
RSP: 0018:ffffc900014b6f40 EFLAGS: 00000246
RAX: 1ffff1102433e87a RBX: 00000000ffff0000 RCX: ffff888107194f00
RDX: 0000000000000002 RSI: 00000000ffff0000 RDI: 0000000000000000
RBP: ffffc900014b6f70 R08: ffff888107194f00 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: 00000000fffffff1
R13: dffffc0000000000 R14: ffff8881219f43d0 R15: ffff88812baa7440
FS:  00007f87129656c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000012c0 CR3: 0000000169f9f000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x111/0x340 net/sched/sch_api.c:794
 sfq_change net/sched/sch_sfq.c:737 [inline]
 sfq_init+0x1b59/0x2870 net/sched/sch_sfq.c:801
 qdisc_create+0x7ed/0x11a0 net/sched/sch_api.c:1266
 tc_modify_qdisc+0x8eb/0x15a0 net/sched/sch_api.c:1726
 rtnetlink_rcv_msg+0x9e4/0xb90 net/core/rtnetlink.c:5650
 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1922
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526
 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 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: 0033:0x7f8713efd749
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:00007f8712965038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8714153fa0 RCX: 00007f8713efd749
RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000004
RBP: 00007f8713f81f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8714154038 R14: 00007f8714153fa0 R15: 00007ffe6e1095f8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729