RBP: 00007f6059f38b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f605a11c038 R14: 00007f605a11bfa0 R15: 00007fffb3060978 watchdog: BUG: soft lockup - CPU#1 stuck for 225s! [syz.2.17:558] Modules linked in: CPU: 1 PID: 558 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__sanitizer_cov_trace_switch+0x17/0xe0 kernel/kcov.c:312 Code: 10 4a 89 74 02 18 4a 89 44 02 20 48 ff c1 48 89 0a 5d c3 48 8b 4e 08 48 83 c1 f8 48 c1 c1 3d 48 83 f9 08 0f 92 c0 b2 8b d2 ea <20> c2 80 fa 01 0f 85 b7 00 00 00 48 8b 06 48 85 c0 0f 84 ab 00 00 RSP: 0018:ffffc90001036f00 EFLAGS: 00000a06 RAX: 0000000000000001 RBX: ffff8881165b9c3c RCX: 0000000000000003 RDX: 0000000000000011 RSI: ffffffff86b041c0 RDI: 00000000fffffff1 RBP: ffffc90001036f50 R08: ffff8881163cd500 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1 R13: ffff8881165b9ccc R14: dffffc0000000000 R15: ffff8881165b9c00 FS: 00007f6059d056c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000012c0 CR3: 000000012d8d9000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fq_change+0xc5d/0x1250 net/sched/sch_fq.c:915 fq_init+0x3e3/0x5d0 net/sched/sch_fq.c:963 qdisc_create+0x803/0x11b0 net/sched/sch_api.c:1255 tc_modify_qdisc+0x8ad/0x1570 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0xb1c/0xdd0 net/core/rtnetlink.c:5684 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5702 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x87c/0xa40 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x87b/0xb90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg net/socket.c:2535 [inline] __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2535 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: 0033:0x7f6059ea2629 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:00007f6059d05028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f605a11bfa0 RCX: 00007f6059ea2629 RDX: 0000000020040080 RSI: 0000200000001200 RDI: 0000000000000005 RBP: 00007f6059f38b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f605a11c038 R14: 00007f605a11bfa0 R15: 00007fffb3060978 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:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729