watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor759:13404] Modules linked in: irq event stamp: 18032 hardirqs last enabled at (18031): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (18032): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (13650): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (13587): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (13587): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 13404 Comm: syz-executor759 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x50 kernel/kcov.c:101 Code: ff 4c 89 ef e8 04 dd 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 <65> 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 83 RSP: 0018:ffff8880a4ab7150 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8880a9622380 RBX: ffff8880a4ab74a0 RCX: ffffffff81763ec6 RDX: 0000000000000000 RSI: ffffffff81763f4d RDI: ffff888092dc07c8 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000007 R11: ffffffff8c66501b R12: 00000000000014fb R13: dffffc0000000000 R14: 0000000000000004 R15: ffff888092dc0500 FS: 00007f4ce6b57700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ee7000 CR3: 0000000099ac6000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_output_read_group kernel/events/core.c:6219 [inline] perf_output_read+0xccd/0x1270 kernel/events/core.c:6254 perf_output_sample+0xc1b/0x18f0 kernel/events/core.c:6296 __perf_event_output kernel/events/core.c:6621 [inline] perf_event_output_forward+0x12f/0x270 kernel/events/core.c:6634 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7907 perf_swevent_overflow kernel/events/core.c:7983 [inline] perf_swevent_event+0x347/0x550 kernel/events/core.c:8011 do_perf_sw_event kernel/events/core.c:8124 [inline] ___perf_sw_event+0x309/0x570 kernel/events/core.c:8155 __perf_sw_event+0x58/0x120 kernel/events/core.c:8167 perf_sw_event include/linux/perf_event.h:1074 [inline] __do_page_fault+0x80e/0xd60 arch/x86/mm/fault.c:1453 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 0f 01 cb 83 RSP: 0018:ffff8880a4ab7a50 EFLAGS: 00050206 RAX: ffffed1013baaea0 RBX: 0000000000007500 RCX: 0000000000005fcb RDX: 0000000000007500 RSI: 0000000020ee7000 RDI: ffff88809dd51535 RBP: 0000000020ee5acb R08: 0000000000000001 R09: ffffed1013baae9f R10: ffff88809dd574ff R11: 0000000000000000 R12: ffff88809dd50000 R13: 0000000020eecfcb R14: 00007ffffffff000 R15: 0000000000000000 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:71 [inline] copyin+0xcd/0xf0 lib/iov_iter.c:146 _copy_from_iter_full+0x1df/0x7c0 lib/iov_iter.c:724 copy_from_iter_full include/linux/uio.h:124 [inline] skb_do_copy_data_nocache include/net/sock.h:1971 [inline] skb_copy_to_page_nocache include/net/sock.h:1997 [inline] tcp_sendmsg_locked+0x126b/0x2f60 net/ipv4/tcp.c:1364 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1462 inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 __sys_sendto+0x21a/0x320 net/socket.c:1899 __do_sys_sendto net/socket.c:1911 [inline] __se_sys_sendto net/socket.c:1907 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1907 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4ce6ba94a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 15 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4ce6b57308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f4ce6c324e8 RCX: 00007f4ce6ba94a9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006 RBP: 00007f4ce6c324e0 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ce6bff4a4 R13: 00007ffcf722516f R14: 00007f4ce6b57400 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: ff 4c 89 ef decl -0x11(%rcx,%rcx,4) 4: e8 04 dd 35 00 callq 0x35dd0d 9: e9 23 fe ff ff jmpq 0xfffffe31 e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 48 8b 34 24 mov (%rsp),%rsi 21: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 28: 01 00 * 2a: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59fd <-- trapping instruction 31: 81 e2 00 01 1f 00 and $0x1f0100,%edx 37: 75 2b jne 0x64 39: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx 3f: 83 .byte 0x83