watchdog: BUG: soft lockup - CPU#1 stuck for 226s! [syz-executor.1:11371] Modules linked in: CPU: 1 PID: 11371 Comm: syz-executor.1 Not tainted 6.1.43-syzkaller-00260-g131de563f627 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 RIP: 0010:trylock_clear_pending kernel/locking/qspinlock_paravirt.h:121 [inline] RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:435 [inline] RIP: 0010:__pv_queued_spin_lock_slowpath+0x5e4/0xda0 kernel/locking/qspinlock.c:511 Code: 10 c6 00 00 48 8b 44 24 18 0f b6 04 10 84 c0 0f 85 48 01 00 00 48 8b 44 24 08 c6 00 01 bb 00 80 ff ff eb 06 f3 90 ff c3 74 5d <41> 0f b6 04 14 84 c0 75 36 41 80 3f 00 75 eb 4c 89 ff be 02 00 00 RSP: 0018:ffffc9000d0e6ca0 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 00000000ffff881e RCX: ffffffff84fbdc6c RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881587738ac RBP: ffffc9000d0e6d90 R08: dffffc0000000000 R09: ffffed102b0ee716 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1102b0ee715 R13: ffff88823fe93180 R14: 1ffff1103ee20001 R15: ffff8881587738ac FS: 00007f4f3cb476c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32922000 CR3: 0000000128a17000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock include/linux/spinlock.h:186 [inline] __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x139/0x1b0 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:355 [inline] get_dist_table+0x215/0x2e0 net/sched/sch_netem.c:798 netem_change+0x9ec/0x20b0 net/sched/sch_netem.c:985 netem_init+0x5b/0xb0 net/sched/sch_netem.c:1072 qdisc_create+0x889/0x1160 net/sched/sch_api.c:1314 tc_modify_qdisc+0x8d0/0x19c0 rtnetlink_rcv_msg+0x9a5/0xca0 net/core/rtnetlink.c:6103 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2525 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6121 netlink_unicast_kernel net/netlink/af_netlink.c:1328 [inline] netlink_unicast+0x8ee/0xad0 net/netlink/af_netlink.c:1354 netlink_sendmsg+0xa15/0xd30 net/netlink/af_netlink.c:1903 sock_sendmsg_nosec net/socket.c:716 [inline] sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x5dc/0x9d0 net/socket.c:2482 ___sys_sendmsg net/socket.c:2536 [inline] __sys_sendmsg+0x2a9/0x390 net/socket.c:2565 __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2572 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4f3be7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4f3cb470c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4f3bf9bf80 RCX: 00007f4f3be7cae9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 RBP: 00007f4f3bec847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f4f3bf9bf80 R15: 00007ffdb158f828 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 440 Comm: kworker/u4:4 Not tainted 6.1.43-syzkaller-00260-g131de563f627 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:442 [inline] RIP: 0010:smp_call_function_many_cond+0x851/0x930 kernel/smp.c:987 Code: 3e 44 89 fe 83 e6 01 31 ff e8 9b 82 09 00 41 83 e7 01 49 bf 00 00 00 00 00 fc ff df 75 0a e8 d6 7e 09 00 e9 2f ff ff ff f3 90 <42> 0f b6 04 3b 84 c0 75 14 41 f7 06 01 00 00 00 0f 84 12 ff ff ff RSP: 0018:ffffc9000ae8f840 EFLAGS: 00000293 RAX: ffffffff816b7e1c RBX: 1ffff1103ee27701 RCX: ffff88810d890000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000ae8f958 R08: ffffffff816b7de5 R09: ffffed103ee0707b R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: 0000000800000000 R14: ffff8881f713b808 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c001c1d000 CR3: 0000000006c0f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x80 kernel/smp.c:1155 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1316 [inline] text_poke_bp_batch+0x1e9/0x730 arch/x86/kernel/alternative.c:1516 text_poke_flush arch/x86/kernel/alternative.c:1707 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1714 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146 __jump_label_update+0x36a/0x380 kernel/jump_label.c:455 jump_label_update+0x3af/0x450 kernel/jump_label.c:801 static_key_disable_cpuslocked+0xcd/0x1b0 kernel/jump_label.c:207 static_key_disable+0x1a/0x30 kernel/jump_label.c:215 toggle_allocation_gate+0x3b4/0x450 mm/kfence/core.c:818 process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299 worker_thread+0xa60/0x1260 kernel/workqueue.c:2446 kthread+0x26d/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306