watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.3.1978:6572]
Modules linked in:
CPU: 0 PID: 6572 Comm: syz.3.1978 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:qdisc_lookup+0xd/0x4d0 net/sched/sch_api.c:299
Code: e1 07 80 c1 03 38 c1 0f 8c 95 fe ff ff 4c 89 f7 e8 b8 20 ce fd e9 88 fe ff ff 0f 1f 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 <50> 89 f3 49 89 fe e8 18 a0 8e fd 31 ff 89 de e8 bf a3 8e fd 85 db
RSP: 0018:ffffc90000a86ef0 EFLAGS: 00000286
RAX: 1ffff110273f6b00 RBX: 0000000000000000 RCX: ffff88811254d000
RDX: 0000000000000002 RSI: 00000000ffff0000 RDI: ffff88812745e000
RBP: ffffc90000a86f18 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000150de0 R12: 00000000fffffff1
R13: dffffc0000000000 R14: ffff888139fb5800 R15: ffff888139fb6c40
FS:  00007fa4951706c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fddb432c2f8 CR3: 0000000123af7000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 qdisc_tree_reduce_backlog+0x10b/0x380 net/sched/sch_api.c:801
 fq_change+0xd53/0x1350 net/sched/sch_fq.c:925
 fq_init+0x3e3/0x5d0 net/sched/sch_fq.c:973
 qdisc_create+0x807/0x11a0 net/sched/sch_api.c:1273
 tc_modify_qdisc+0x8ce/0x1550 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x9fd/0xcb0 net/core/rtnetlink.c:5662
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2520
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5680
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1923
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x236/0x2e0 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+0x201/0x2d0 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: 0033:0x7fa496718559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa495170028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa49699efa0 RCX: 00007fa496718559
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007fa4967afb20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa49699f038 R14: 00007fa49699efa0 R15: 00007ffd9776ffb8
 </TASK>