watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz-executor.4:18273] Modules linked in: irq event stamp: 18255423 hardirqs last enabled at (18255422): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 hardirqs last disabled at (18255423): [] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1097 softirqs last enabled at (6017062): [] ipt_do_table+0xcf4/0x1970 net/ipv4/netfilter/ip_tables.c:356 softirqs last disabled at (6017199): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (6017199): [] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 CPU: 0 PID: 18273 Comm: syz-executor.4 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_kcov_mode+0x9/0x40 kernel/kcov.c:166 Code: 59 fe ff ff 48 8b 7c 24 08 e8 33 c6 46 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 b9 c9 8a 7e 89 c2 <81> e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 a4 RSP: 0018:ffffc90000007c40 EFLAGS: 00000246 RAX: 0000000000000101 RBX: ffff88805b3b6180 RCX: 0000000000000000 RDX: 0000000000000101 RSI: ffff888017e28000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff875d7f8f R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88807de0fb00 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f80c57e6700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9de63a3998 CR3: 000000006fb5e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: write_comp_data kernel/kcov.c:221 [inline] __sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:287 pie_calculate_probability+0xff/0x7c0 net/sched/sch_pie.c:327 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:arch_stack_walk+0x9f/0xe0 arch/x86/kernel/stacktrace.c:30 Code: ff ff ff e8 d3 a4 07 00 8b 85 78 ff ff ff 85 c0 74 14 48 8d bd 78 ff ff ff e8 bd a1 07 00 48 85 c0 48 89 c6 75 cd 48 8b 45 d8 <65> 48 2b 04 25 28 00 00 00 75 2f 48 83 c4 68 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc900058eed90 EFLAGS: 00000246 RAX: 599019198095d400 RBX: ffffffff8165bc10 RCX: ffffc900058eecb8 RDX: 1ffff11002fc514a RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900058eee18 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffc900058eee48 R13: 0000000000000000 R14: ffff888017e28000 R15: ffff888054e41a78 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_krealloc+0x11f/0x170 mm/kasan/common.c:581 kasan_krealloc include/linux/kasan.h:289 [inline] __do_krealloc mm/slab_common.c:1196 [inline] krealloc+0x54/0xf0 mm/slab_common.c:1233 nf_ct_ext_add+0x2d8/0x6c0 net/netfilter/nf_conntrack_extend.c:73 nf_ct_ecache_ext_add include/net/netfilter/nf_conntrack_ecache.h:55 [inline] init_conntrack.constprop.0+0x5e1/0x1400 net/netfilter/nf_conntrack_core.c:1656 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1746 [inline] nf_conntrack_in+0xf28/0x15e0 net/netfilter/nf_conntrack_core.c:1901 ipv4_conntrack_local+0x11c/0x220 net/netfilter/nf_conntrack_proto.c:213 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:619 nf_hook+0x1cb/0x5b0 include/linux/netfilter.h:262 __ip_local_out+0x26e/0x530 net/ipv4/ip_output.c:115 ip_local_out net/ipv4/ip_output.c:124 [inline] ip_send_skb net/ipv4/ip_output.c:1555 [inline] ip_push_pending_frames+0x97/0x2b0 net/ipv4/ip_output.c:1575 raw_sendmsg+0x12ef/0x2e50 net/ipv4/raw.c:673 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3080 inet_sendpage+0x103/0x140 net/ipv4/af_inet.c:834 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504 kernel_sendpage net/socket.c:3501 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1960 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f80c6891af9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f80c57e6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f80c69a5028 RCX: 00007f80c6891af9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f80c68ebff7 R08: 000000000002ffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f80c6ed8b2f R14: 00007f80c57e6300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11064 Comm: kworker/u4:7 Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xc/0x70 kernel/kcov.c:286 Code: 00 00 00 48 89 7c 30 e8 48 89 4c 30 f0 4c 89 54 d8 20 48 89 10 5b c3 0f 1f 80 00 00 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 <89> f1 65 48 8b 34 25 40 70 02 00 e8 14 f9 ff ff 84 c0 74 4b 48 8b RSP: 0018:ffffc900055679f0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b9c41d40 RCX: 0000000000000000 RDX: ffff88807861ba00 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff816c3596 R11: 0000000000000000 R12: ffffed10173883a9 R13: 0000000000000000 R14: ffff8880b9c41d48 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f750071e000 CR3: 000000000b88e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csd_lock_wait kernel/smp.c:440 [inline] smp_call_function_many_cond+0x476/0xc20 kernel/smp.c:969 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1135 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1112 [inline] text_poke_bp_batch+0x1b3/0x560 arch/x86/kernel/alternative.c:1297 text_poke_flush arch/x86/kernel/alternative.c:1451 [inline] text_poke_flush arch/x86/kernel/alternative.c:1448 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1458 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d5/0x430 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:732 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:724 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 5: e8 33 c6 46 00 callq 0x46c63d a: e9 61 fd ff ff jmpq 0xfffffd70 f: cc int3 10: cc int3 11: cc int3 12: cc int3 13: cc int3 14: cc int3 15: cc int3 16: cc int3 17: cc int3 18: cc int3 19: cc int3 1a: cc int3 1b: cc int3 1c: cc int3 1d: 65 8b 05 b9 c9 8a 7e mov %gs:0x7e8ac9b9(%rip),%eax # 0x7e8ac9dd 24: 89 c2 mov %eax,%edx * 26: 81 e2 00 01 00 00 and $0x100,%edx <-- trapping instruction 2c: a9 00 01 ff 00 test $0xff0100,%eax 31: 74 10 je 0x43 33: 31 c0 xor %eax,%eax 35: 85 d2 test %edx,%edx 37: 74 15 je 0x4e 39: 8b .byte 0x8b 3a: 96 xchg %eax,%esi 3b: a4 movsb %ds:(%rsi),%es:(%rdi)