watchdog: BUG: soft lockup - CPU#0 stuck for 117s! [syz.0.2565:10855]
Modules linked in:
CPU: 0 PID: 10855 Comm: syz.0.2565 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:qdisc_dev include/net/sch_generic.h:603 [inline]
RIP: 0010:qdisc_match_from_root net/sched/sch_api.c:263 [inline]
RIP: 0010:qdisc_lookup+0x27e/0x4d0 net/sched/sch_api.c:309
Code: 10 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 d5 a5 ec fd 4d 8b 36 4d 8d 7e 40 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 ff e8 b8 a5 ec fd 4d 8b 3f 4c 89 f8 48 c1 e8 03 42 80
RSP: 0018:ffffc90001cbef28 EFLAGS: 00000246
RAX: 1ffff11020e36488 RBX: 00000000ffff0000 RCX: ffff888113dae400
RDX: 0000000000000000 RSI: 00000000ffff0000 RDI: 0000000000000000
RBP: ffffc90001cbef58 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000397de8 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8881071b2400 R15: ffff8881071b2440
FS:  00007fca69bd86c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca69bd7ff8 CR3: 000000014fc37000 CR4: 00000000003506b0
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: 0033:0x7fca6b180b19
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:00007fca69bd8028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fca6b406fa0 RCX: 00007fca6b180b19
RDX: 0000000024048000 RSI: 0000200000000740 RDI: 0000000000000003
RBP: 00007fca6b218b70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca6b407038 R14: 00007fca6b406fa0 R15: 00007ffdffca2b78
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:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0x12/0x20 arch/x86/kernel/process.c:717