================================================================== BUG: KCSAN: data-race in __x64_sys_ptrace / ptrace_stop write to 0xffff88811e93e010 of 8 bytes by task 24059 on cpu 1: ptrace_stop+0x5e/0x4f0 kernel/signal.c:2145 ptrace_signal kernel/signal.c:2490 [inline] get_signal+0xc0b/0x1290 kernel/signal.c:2635 do_signal+0x2b/0x840 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x24a/0x2c0 arch/x86/entry/common.c:161 prepare_exit_to_usermode+0x194/0x1e0 arch/x86/entry/common.c:196 swapgs_restore_regs_and_return_to_usermode+0x0/0x40 read to 0xffff88811e93e010 of 8 bytes by task 24061 on cpu 0: 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+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 24061 Comm: syz-executor.5 Not tainted 5.7.0-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: 0 PID: 24061 Comm: syz-executor.5 Not tainted 5.7.0-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/0x1a kernel/kcsan/report.c:626 kcsan_setup_watchpoint+0x3fb/0x440 kernel/kcsan/core.c:519 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+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ca69 Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffa37138c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00000000004fa900 RCX: 000000000045ca69 RDX: 0000000000000000 RSI: 000000000000051f RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000086a R14: 00000000004cb4b9 R15: 00007ffa371396d4 Kernel Offset: disabled Rebooting in 86400 seconds..