================================================================== BUG: KCSAN: data-race in __x64_sys_ptrace / ptrace_stop write to 0xffff888120fb40d0 of 8 bytes by task 15456 on cpu 0: ptrace_stop+0x5e/0x4f0 kernel/signal.c:2140 ptrace_do_notify+0xe7/0x110 kernel/signal.c:2263 ptrace_notify+0x8c/0xc0 kernel/signal.c:2273 ptrace_report_syscall include/linux/tracehook.h:66 [inline] tracehook_report_syscall_entry include/linux/tracehook.h:104 [inline] syscall_trace_enter+0x4c7/0x720 arch/x86/entry/common.c:84 do_syscall_64+0x2ab/0x390 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888120fb40d0 of 8 bytes by task 15457 on cpu 1: ptrace_unfreeze_traced kernel/ptrace.c:193 [inline] __do_sys_ptrace kernel/ptrace.c:1279 [inline] __se_sys_ptrace kernel/ptrace.c:1242 [inline] __x64_sys_ptrace+0x14e/0x270 kernel/ptrace.c:1242 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15457 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 15457 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x11d/0x187 lib/dump_stack.c:118 panic+0x210/0x640 kernel/panic.c:221 kcsan_report.cold+0xc/0xf kernel/kcsan/report.c:599 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:507 ptrace_unfreeze_traced kernel/ptrace.c:193 [inline] __do_sys_ptrace kernel/ptrace.c:1279 [inline] __se_sys_ptrace kernel/ptrace.c:1242 [inline] __x64_sys_ptrace+0x14e/0x270 kernel/ptrace.c:1242 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f66f86a2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00007f66f86a36d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 00000000000002a4 RDI: 000000000000001f RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000862 R14: 00000000004cb1e9 R15: 000000000076bf0c Kernel Offset: disabled Rebooting in 86400 seconds..