watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.3:16305] Modules linked in: irq event stamp: 26348 hardirqs last enabled at (26347): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (26348): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (21938): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (21781): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (21781): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 16305 Comm: syz-executor.3 Not tainted 4.14.281-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b2e58440 task.stack: ffff88805cf00000 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:60 RSP: 0018:ffff88805cf07288 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10 RAX: 0000000529837160 RBX: 0000000529837160 RCX: ffffc90007ff4000 RDX: 0000000000040000 RSI: ffffffff81637d2c RDI: ffff8880a87c9498 RBP: ffff88805cf07370 R08: ffff88823fff7018 R09: ffff88823fff700f R10: ffff88823fff7017 R11: 00000041baf0777f R12: dffffc0000000000 R13: ffffed100b9e0eaa R14: ffff88805cf07528 R15: ffff8880a87c9400 FS: 00007fe5386a0700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020f7a000 CR3: 00000000a2645000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: primary_event_id kernel/events/core.c:1316 [inline] perf_output_read_group kernel/events/core.c:5897 [inline] perf_output_read+0x5f7/0x1090 kernel/events/core.c:5932 perf_output_sample+0xa28/0x16f0 kernel/events/core.c:5974 __perf_event_output kernel/events/core.c:6287 [inline] perf_event_output_forward+0xf8/0x1f0 kernel/events/core.c:6300 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549 perf_swevent_overflow kernel/events/core.c:7625 [inline] perf_swevent_event+0x299/0x460 kernel/events/core.c:7653 do_perf_sw_event kernel/events/core.c:7766 [inline] ___perf_sw_event+0x2a1/0x480 kernel/events/core.c:7797 __perf_sw_event+0x4f/0x100 kernel/events/core.c:7809 perf_sw_event include/linux/perf_event.h:1046 [inline] __do_page_fault+0x692/0xad0 arch/x86/mm/fault.c:1483 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181 RSP: 0018:ffff88805cf07a60 EFLAGS: 00050206 RAX: ffffed100b8ae000 RBX: 0000000000008000 RCX: 0000000000003acb RDX: 0000000000008000 RSI: 0000000020f7a000 RDI: ffff88805c56c535 RBP: 0000000020f75acb R08: 0000000000000001 R09: ffffed100b8adfff R10: ffff88805c56ffff R11: 0000000000000000 R12: ffff88805c568000 R13: 00007ffffffff000 R14: 0000000020f7dacb R15: ffff8880aa560280 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:55 [inline] copyin+0x99/0xc0 lib/iov_iter.c:146 _copy_from_iter_full+0x19c/0x760 lib/iov_iter.c:610 copy_from_iter_full include/linux/uio.h:126 [inline] skb_do_copy_data_nocache include/net/sock.h:1892 [inline] skb_copy_to_page_nocache include/net/sock.h:1918 [inline] tcp_sendmsg_locked+0x23fc/0x2ef0 net/ipv4/tcp.c:1360 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x11a/0x4e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 SYSC_sendto net/socket.c:1763 [inline] SyS_sendto+0x1c7/0x2c0 net/socket.c:1731 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe539d2b109 RSP: 002b:00007fe5386a0168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fe539e3df60 RCX: 00007fe539d2b109 RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000007 RBP: 00007fe539d8508d R08: 0000000000000000 R09: 0000000000000053 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffee96baadf R14: 00007fe5386a0300 R15: 0000000000022000 Code: ff ff 48 89 df e8 c1 b8 29 00 e9 9f fe ff ff 4c 89 e7 e8 b4 b8 29 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 48 8b 04 25 c0 7f 02 00 48 85 c0 74 1a 65 8b 15 9b 38 ad 7e Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff87246b5e ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 48 89 df mov %rbx,%rdi 3: e8 c1 b8 29 00 callq 0x29b8c9 8: e9 9f fe ff ff jmpq 0xfffffeac d: 4c 89 e7 mov %r12,%rdi 10: e8 b4 b8 29 00 callq 0x29b8c9 15: e9 2c fe ff ff jmpq 0xfffffe46 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop * 29: 65 48 8b 04 25 c0 7f mov %gs:0x27fc0,%rax <-- trapping instruction 30: 02 00 32: 48 85 c0 test %rax,%rax 35: 74 1a je 0x51 37: 65 8b 15 9b 38 ad 7e mov %gs:0x7ead389b(%rip),%edx # 0x7ead38d9