watchdog: BUG: soft lockup - CPU#0 stuck for 287s! [syz.5.57:545]
Modules linked in:
CPU: 0 PID: 545 Comm: syz.5.57 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:227 [inline]
RIP: 0010:__sanitizer_cov_trace_cmp4+0x36/0x90 kernel/kcov.c:267
Code: 40 c0 98 7e 65 8b 15 41 c0 98 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 5b 83 b9 5c 0b 00 00 00 74 52 8b 91 38 0b 00 00 <83> fa 03 75 47 48 8b 91 40 0b 00 00 44 8b 89 3c 0b 00 00 49 c1 e1
RSP: 0018:ffffc900011f6db8 EFLAGS: 00000246
RAX: ffffffff83da4ccc RBX: 00000000ffff0000 RCX: ffff88811aac2780
RDX: 0000000000000002 RSI: 00000000ffff0000 RDI: 00000000ffff0000
RBP: ffffc900011f6db8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200023edbc R12: ffff888111bfc000
R13: dffffc0000000000 R14: ffff88811ae1ec00 R15: 00000000ffff0000
FS:  00007f31afdb06c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002780 CR3: 000000011aeff000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 qdisc_match_from_root net/sched/sch_api.c:267 [inline]
 qdisc_lookup+0x2fc/0x4d0 net/sched/sch_api.c:309
 qdisc_tree_reduce_backlog+0x10b/0x380 net/sched/sch_api.c:784
 codel_change+0x8e4/0xc20 net/sched/sch_codel.c:180
 codel_init+0x1a3/0x390 net/sched/sch_codel.c:199
 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:5653
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5671
 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:1922
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2435
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489
 __sys_sendmmsg+0x2ba/0x4e0 net/socket.c:2575
 __do_sys_sendmmsg net/socket.c:2604 [inline]
 __se_sys_sendmmsg net/socket.c:2601 [inline]
 __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2601
 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:308
 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: 0033:0x7f31b1355e59
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:00007f31afdb0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f31b15cefa0 RCX: 00007f31b1355e59
RDX: 040000000000009f RSI: 00002000000002c0 RDI: 0000000000000008
RBP: 00007f31b13ebe6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31b15cf038 R14: 00007f31b15cefa0 R15: 00007ffcd2606bf8
 </TASK>
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