watchdog: BUG: soft lockup - CPU#1 stuck for 23s! [syz-executor.2:28606] Modules linked in: irq event stamp: 160602 hardirqs last enabled at (160601): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (160602): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (160600): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (160429): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (160429): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 1 PID: 28606 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x50 kernel/kcov.c:107 Code: 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 fa 02 75 20 48 8b 88 68 13 00 00 <8b> 80 64 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 RSP: 0018:ffff888064c27150 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8880b30e8180 RBX: ffff888064c274a0 RCX: ffffc900078d1000 RDX: 0000000000000002 RSI: ffffffff81763dee RDI: ffff8880a0a2c0d0 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000007 R11: ffffffff8c66505b R12: ffff888064c272a0 R13: dffffc0000000000 R14: 0000000000000e78 R15: 0000000000000010 FS: 00007f1161eda700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020fe6000 CR3: 00000000a567d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: perf_output_read_group kernel/events/core.c:6213 [inline] perf_output_read+0xb6e/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:ffff888064c27a50 EFLAGS: 00050202 RAX: ffffed100f656f50 RBX: 0000000000007a80 RCX: 0000000000006fcb RDX: 0000000000007a80 RSI: 0000000020fe6000 RDI: ffff88807b2b0ab5 RBP: 0000000020fe554b R08: 0000000000000001 R09: ffffed100f656f4f R10: ffff88807b2b7a7f R11: 0000000000000000 R12: ffff88807b2b0000 R13: 0000000020fecfcb 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: 0033:0x7f11635650e9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1161eda168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f1163677f60 RCX: 00007f11635650e9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006 RBP: 00007f11635bf08d R08: 0000000000000000 R09: 0000000000000053 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcfc8ea9df R14: 00007f1161eda300 R15: 0000000000022000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 ---------------- Code disassembly (best guess): 0: 65 48 8b 04 25 c0 df mov %gs:0x1dfc0,%rax 7: 01 00 9: 65 8b 15 cc 59 9f 7e mov %gs:0x7e9f59cc(%rip),%edx # 0x7e9f59dc 10: 81 e2 00 01 1f 00 and $0x1f0100,%edx 16: 75 2b jne 0x43 18: 8b 90 60 13 00 00 mov 0x1360(%rax),%edx 1e: 83 fa 02 cmp $0x2,%edx 21: 75 20 jne 0x43 23: 48 8b 88 68 13 00 00 mov 0x1368(%rax),%rcx * 2a: 8b 80 64 13 00 00 mov 0x1364(%rax),%eax <-- trapping instruction 30: 48 8b 11 mov (%rcx),%rdx 33: 48 83 c2 01 add $0x1,%rdx 37: 48 39 d0 cmp %rdx,%rax 3a: 76 07 jbe 0x43 3c: 48 89 34 d1 mov %rsi,(%rcx,%rdx,8)