RBP: 00007fc223b0db39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc223cf1038 R14: 00007fc223cf0fa0 R15: 00007ffd7299bc68 watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.2.17:497] Modules linked in: CPU: 0 PID: 497 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:196 Code: 00 00 55 48 89 e5 53 48 89 fb e8 13 00 00 00 48 8b 3d 7c c3 5e 05 48 89 de e8 e4 e0 39 00 5b 5d c3 00 55 48 89 e5 48 8b 45 08 <65> 48 8b 0d 20 ba 9d 7e 65 8b 15 25 ba 9d 7e f7 c2 00 01 ff 00 74 RSP: 0018:ffffc90000d76f18 EFLAGS: 00000246 RAX: ffffffff83b2a42f RBX: dffffc0000000000 RCX: 1ffffffff0ae1620 RDX: ffff88811810cf00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000d76f18 R08: ffff88811810cf00 R09: 0000000000000002 R10: 00000000ffffffff R11: 0000000000000000 R12: 00000000fffffff1 R13: ffff8881118e2400 R14: ffffffff8570b0e0 R15: ffff8881118e2400 FS: 00007fc2238da6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000012c0 CR3: 0000000117d6a000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: qdisc_tree_reduce_backlog+0x1ef/0x340 net/sched/sch_api.c:789 fq_change+0xbdb/0x1100 net/sched/sch_fq.c:915 fq_init+0x3e3/0x5d0 net/sched/sch_fq.c:963 qdisc_create+0x848/0x1220 net/sched/sch_api.c:1255 tc_modify_qdisc+0x8a1/0x1490 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0xa31/0xcc0 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x89c/0xb50 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg net/socket.c:2466 [inline] __x64_sys_sendmsg+0x1f9/0x2c0 net/socket.c:2466 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fc223a77629 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:00007fc2238da028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc223cf0fa0 RCX: 00007fc223a77629 RDX: 0000000020040080 RSI: 0000200000001200 RDI: 0000000000000005 RBP: 00007fc223b0db39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc223cf1038 R14: 00007fc223cf0fa0 R15: 00007ffd7299bc68 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:user_mode arch/x86/include/asm/ptrace.h:136 [inline] RIP: 0010:irqentry_enter+0x0/0x30 kernel/entry/common.c:298 Code: 0f 1f 84 00 00 00 00 00 66 90 55 48 89 e5 5d c3 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e8 67 ac d6 fc e8 c2 f0 ff ff 5d c3 87 88 00 00 00 03 75 0e 65 48 8b 05 df df 84 7b f6 40 24 02 75 RSP: 0018:ffffc90000107cb8 EFLAGS: 00000097 RAX: 0000000084a00e77 RBX: ffffc90000107ce8 RCX: ffffffff84a00e77 RDX: 0000000000000000 RSI: ffffffff84a00c7a RDI: ffffc90000107ce8 RBP: ffffc90000107cd8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6102ce0000 CR3: 000000010cd69000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635 RIP: 0010:default_idle+0x12/0x20 arch/x86/kernel/process.c:718 Code: 44 2a 00 00 49 bd 00 00 00 00 00 fc ff df e9 67 ff ff ff e8 d0 f7 fa ff 55 48 89 e5 0f 1f 44 00 00 0f 00 2d 90 49 62 00 fb f4 <5d> c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 55 48 89 e5 41 57 41 56 RSP: 0018:ffffc90000107d98 EFLAGS: 00000242 RAX: ffff8881f7100000 RBX: ffff888100292780 RCX: 000000000003c1a2 RDX: 0000000000000001 RSI: ffffffff85408200 RDI: ffffffff854081c0 RBP: ffffc90000107d98 R08: ffff8881f71573d3 R09: 1ffff1103ee2ae7a R10: dffffc0000000000 R11: ffffed103ee2ae7b R12: 1ffff110200524f0 R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:709 default_idle_call+0x71/0x1d0 kernel/sched/idle.c:114 cpuidle_idle_call kernel/sched/idle.c:196 [inline] do_idle+0x1dc/0x570 kernel/sched/idle.c:308 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:404 start_secondary+0x2e9/0x3a0 arch/x86/kernel/smpboot.c:276 secondary_startup_64_no_verify+0xad/0xbb