watchdog: BUG: soft lockup - CPU#1 stuck for 111s! [syz.2.3623:28188]
Modules linked in:
CPU: 1 PID: 28188 Comm: syz.2.3623 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:qdisc_lookup+0xa/0x4d0 net/sched/sch_api.c:299
Code: 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c 95 fe ff ff 4c 89 f7 e8 f8 c6 ec 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 39 b2 fd 31 ff 89 de e8 bf 3c b2
RSP: 0018:ffffc9000194ef40 EFLAGS: 00000286
RAX: 1ffff11024b87480 RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff88811b308000 RSI: 00000000ffff0000 RDI: ffff888125d9a000
RBP: ffffc9000194ef58 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000329de8 R12: 00000000fffffff1
R13: dffffc0000000000 R14: ffff888125c3a400 R15: ffff888125c39840
FS:  00007ff50b31c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001271b6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 qdisc_tree_reduce_backlog+0x10b/0x380 net/sched/sch_api.c:800
 fq_change+0xc9f/0x11d0 net/sched/sch_fq.c:925
 fq_init+0x3e3/0x5d0 net/sched/sch_fq.c:973
 qdisc_create+0x84c/0x1220 net/sched/sch_api.c:1272
 tc_modify_qdisc+0x8c2/0x1470 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x9e9/0xca0 net/core/rtnetlink.c:5622
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431
 __sys_sendmsg net/socket.c:2460 [inline]
 __do_sys_sendmsg net/socket.c:2469 [inline]
 __se_sys_sendmsg net/socket.c:2467 [inline]
 __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff50c8c4559
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:00007ff50b31c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff50cb4afa0 RCX: 00007ff50c8c4559
RDX: 0000000024048000 RSI: 0000200000000740 RDI: 0000000000000004
RBP: 00007ff50c95bb20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff50cb4b038 R14: 00007ff50cb4afa0 R15: 00007ffe69d4b708
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 0 skipped: idling at default_idle+0x12/0x20 arch/x86/kernel/process.c:717