watchdog: BUG: soft lockup - CPU#0 stuck for 111s! [syz.3.325:1445]
Modules linked in:
CPU: 0 PID: 1445 Comm: syz.3.325 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:165 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:209 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:275
Code: 00 b3 9d 7e 65 8b 0d 05 b3 9d 7e f7 c1 00 01 ff 00 74 11 f7 c1 00 01 00 00 74 5b 83 ba dc 0a 00 00 00 74 52 8b 8a b8 0a 00 00 <83> f9 03 75 47 48 8b 8a c0 0a 00 00 44 8b 8a bc 0a 00 00 49 c1 e1
RSP: 0018:ffffc9000120ef18 EFLAGS: 00000246
RAX: ffffffff83b27b10 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888110952800 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000120ef18 R08: 1ffff110215d7b02 R09: 1ffff110215d7b12
R10: 1ffff110215d7b01 R11: fffff52000241de0 R12: ffff88811464ec00
R13: dffffc0000000000 R14: ffff88811464f800 R15: ffff88811464ec40
FS:  00007f4075df56c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4077271b40 CR3: 00000001177b1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 qdisc_tree_reduce_backlog+0x120/0x380 net/sched/sch_api.c:798
 fq_codel_change+0xa6d/0xeb0 net/sched/sch_fq_codel.c:473
 fq_codel_init+0x2f0/0x8c0 net/sched/sch_fq_codel.c:512
 qdisc_create+0x84c/0x1220 net/sched/sch_api.c:1272
 tc_modify_qdisc+0x8c2/0x1470 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x9e9/0xca0 net/core/rtnetlink.c:5622
 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431
 __sys_sendmsg net/socket.c:2460 [inline]
 __do_sys_sendmsg net/socket.c:2469 [inline]
 __se_sys_sendmsg net/socket.c:2467 [inline]
 __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f407739c2d9
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:00007f4075df5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f4077623fa0 RCX: 00007f407739c2d9
RDX: 00000000000008c0 RSI: 0000200000001400 RDI: 0000000000000005
RBP: 00007f4077433888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4077624038 R14: 00007f4077623fa0 R15: 00007fff35d2e7a8
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:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0x12/0x20 arch/x86/kernel/process.c:717