RBP: 00007f13cf032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f13cf216038 R14: 00007f13cf215fa0 R15: 00007ffe96343b18 watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.2.17:457] Modules linked in: CPU: 0 PID: 457 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:212 Code: 00 00 00 48 8b 3d bc 6b 21 06 48 89 de e8 84 a3 44 00 5b 5d c3 00 90 90 90 90 90 90 90 90 90 90 90 b8 0c 67 40 a5 55 48 89 e5 <48> 8b 45 08 65 48 8b 0d b0 fe 90 7e 65 8b 15 b1 fe 90 7e 81 e2 00 RSP: 0018:ffffc90000796df8 EFLAGS: 00000202 RAX: 1ffff1102363b801 RBX: 00000000ffff0000 RCX: ffff88811b251401 RDX: 0000000000000000 RSI: 00000000ffff0000 RDI: 0000000000000000 RBP: ffffc90000796df8 R08: ffff88811b251440 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffffffffffd8 R15: ffff88811b1dc000 FS: 00007f13cfee86c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f13cee72140 CR3: 0000000116c47000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_match_from_root net/sched/sch_api.c:271 [inline] qdisc_lookup_rcu+0x1a5/0x4e0 net/sched/sch_api.c:324 qdisc_tree_reduce_backlog+0x111/0x360 net/sched/sch_api.c:792 fq_codel_change+0xb3f/0x1090 net/sched/sch_fq_codel.c:440 fq_codel_init+0x384/0xa90 net/sched/sch_fq_codel.c:477 qdisc_create+0x895/0x1180 net/sched/sch_api.c:1306 tc_modify_qdisc+0x900/0x19d0 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0xb3b/0xe00 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x20f/0x460 net/netlink/af_netlink.c:2521 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6168 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x8ab/0xa30 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b9/0xbd0 net/netlink/af_netlink.c:1873 sock_sendmsg_nosec net/socket.c:716 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0x5cc/0x990 net/socket.c:2508 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2562 __sys_sendmsg net/socket.c:2591 [inline] __do_sys_sendmsg net/socket.c:2600 [inline] __se_sys_sendmsg net/socket.c:2598 [inline] __x64_sys_sendmsg+0x205/0x2d0 net/socket.c:2598 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f13cef9c819 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:00007f13cfee8028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f13cf215fa0 RCX: 00007f13cef9c819 RDX: 0000000000008840 RSI: 0000200000000740 RDI: 0000000000000005 RBP: 00007f13cf032c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f13cf216038 R14: 00007f13cf215fa0 R15: 00007ffe96343b18 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:741