watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor672:10785] Modules linked in: irq event stamp: 22868 hardirqs last enabled at (22867): [] trace_hardirqs_on_thunk+0x1a/0x1c hardirqs last disabled at (22868): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (19026): [] __do_softirq+0x678/0x980 kernel/softirq.c:318 softirqs last disabled at (18995): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (18995): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 10785 Comm: syz-executor672 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memcpy_erms+0x8/0x10 arch/x86/lib/memcpy_64.S:56 Code: 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35 RSP: 0018:ffff8880969ef150 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffff8880aded9318 RBX: ffff8880969ef4a0 RCX: 0000000000000000 RDX: 0000000000000008 RSI: ffff8880969ef298 RDI: ffff8880aded9320 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1015bdb263 R10: ffff8880aded931f R11: ffffffff8c66501b R12: ffff8880969ef290 R13: dffffc0000000000 R14: 1ffff11012d3de99 R15: 0000000000000008 FS: 00007f9029f4a700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020e57000 CR3: 00000000ac216000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcpy include/linux/string.h:377 [inline] memcpy_common kernel/events/internal.h:172 [inline] __output_copy kernel/events/internal.h:176 [inline] perf_output_read_group kernel/events/core.c:6221 [inline] perf_output_read+0xd2e/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:ffff8880969efa50 EFLAGS: 00050206 RAX: ffffed1011b27ea0 RBX: 0000000000007500 RCX: 0000000000005fcb RDX: 0000000000007500 RSI: 0000000020e57000 RDI: ffff88808d939535 RBP: 0000000020e55acb R08: 0000000000000001 R09: ffffed1011b27e9f R10: ffff88808d93f4ff R11: 0000000000000000 R12: ffff88808d938000 R13: 0000000020e5cfcb 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: 0033:0x7f9029f9c4a9 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:00007f9029f4a308 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f902a0254e8 RCX: 00007f9029f9c4a9 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006 RBP: 00007f902a0254e0 R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9029ff24a4 R13: 00007ffeb536a41f R14: 00007f9029f4a400 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: eb 1e jmp 0x22 4: 0f 1f 00 nopl (%rax) 7: 48 89 f8 mov %rdi,%rax a: 48 89 d1 mov %rdx,%rcx d: 48 c1 e9 03 shr $0x3,%rcx 11: 83 e2 07 and $0x7,%edx 14: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) 17: 89 d1 mov %edx,%ecx 19: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 1b: c3 retq 1c: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 22: 48 89 f8 mov %rdi,%rax 25: 48 89 d1 mov %rdx,%rcx 28: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) * 2a: c3 retq <-- trapping instruction 2b: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 32: 48 89 f8 mov %rdi,%rax 35: 48 83 fa 20 cmp $0x20,%rdx 39: 72 7e jb 0xb9 3b: 40 38 fe cmp %dil,%sil 3e: 7c 35 jl 0x75