watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [syz.8.1367:4478]
Modules linked in:
CPU: 1 PID: 4478 Comm: syz.8.1367 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x45/0x60 kernel/kcov.c:211
Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 5c 0b 00 00 00 74 2c 8b 91 38 0b 00 00 83 fa 02 75 21 48 8b 91 40 0b 00 00 48 8b 32 <48> 8d 7e 01 8b 89 3c 0b 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89
RSP: 0018:ffffc90000d7eed8 EFLAGS: 00000246
RAX: ffffffff83daaafc RBX: 00000000ffff0000 RCX: ffff8881155a0000
RDX: ffffc90001289000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000d7eed8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520001afde0 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881286b4000
FS:  00007f3fe1c7c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001200 CR3: 00000001344f0000 CR4: 00000000003526a0
Call Trace:
 <TASK>
 qdisc_match_from_root net/sched/sch_api.c:270 [inline]
 qdisc_lookup+0x20c/0x4d0 net/sched/sch_api.c:304
 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: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: 0033:0x7f3fe32230d9
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:00007f3fe1c7c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3fe34aafa0 RCX: 00007f3fe32230d9
RDX: 0000000000000000 RSI: 0000200000001200 RDI: 0000000000000003
RBP: 00007f3fe32ba024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3fe34ab038 R14: 00007f3fe34aafa0 R15: 00007fffe86994b8
 </TASK>
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