RBP: 00007f7cb4ab4eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7cb4ca7038 R14: 00007f7cb4ca6fa0 R15: 00007ffc081fbe98 watchdog: BUG: soft lockup - CPU#0 stuck for 240s! [syz.2.2009:7513] Modules linked in: CPU: 0 PID: 7513 Comm: syz.2.2009 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x90 kernel/kcov.c:294 Code: 00 00 00 4a 89 7c 02 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 48 89 e5 <48> 8b 45 08 65 48 8b 0d 20 b3 98 7e 65 8b 15 21 b3 98 7e 81 e2 00 RSP: 0018:ffffc90000ab6e98 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00000000ffff0000 RCX: 0000000000080000 RDX: ffffc9000234f000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000ab6e98 R08: 1ffff11022517d92 R09: 1ffff11022517d81 R10: dffffc0000000000 R11: fffff52000156dd8 R12: ffff888126ea0000 R13: dffffc0000000000 R14: ffff88810b911800 R15: 0000000000000022 FS: 00007f7cb34786c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7cab097000 CR3: 0000000120b45000 CR4: 00000000003506b0 DR0: 0000000000000005 DR1: 0000000000000005 DR2: 0000000000040004 DR3: 000000000000000a DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_match_from_root net/sched/sch_api.c:266 [inline] qdisc_lookup+0x2d1/0x4d0 net/sched/sch_api.c:309 qdisc_tree_reduce_backlog+0x10b/0x380 net/sched/sch_api.c:784 fq_codel_change+0xa89/0xf60 net/sched/sch_fq_codel.c:436 fq_codel_init+0x33f/0xa40 net/sched/sch_fq_codel.c:473 qdisc_create+0x807/0x11a0 net/sched/sch_api.c:1256 tc_modify_qdisc+0x8ce/0x1550 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x9fd/0xcb0 net/core/rtnetlink.c:5654 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2516 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5672 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1927 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: 0033:0x7f7cb4a1ee99 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:00007f7cb3478028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7cb4ca6fa0 RCX: 00007f7cb4a1ee99 RDX: 0000000000008840 RSI: 0000200000000740 RDI: 0000000000000003 RBP: 00007f7cb4ab4eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7cb4ca7038 R14: 00007f7cb4ca6fa0 R15: 00007ffc081fbe98 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