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KCSAN: data-race in exit_signals / mm_access

Status: auto-closed as invalid on 2020/09/09 07:48
Subsystems: kernel
[Documentation on labels]
First crash: 1331d, last: 1331d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in exit_signals / mm_access

write to 0xffff8880981ee024 of 4 bytes by task 6695 on cpu 1:
 exit_signals+0x124/0x580 kernel/signal.c:2831
 do_exit+0x19f/0x16e0 kernel/exit.c:761
 do_group_exit+0x17a/0x180 kernel/exit.c:903
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:914
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:912
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880981ee024 of 4 bytes by task 6704 on cpu 0:
 get_task_mm kernel/fork.c:1229 [inline]
 mm_access+0x87/0x170 kernel/fork.c:1248
 process_vm_rw_core+0x1b5/0x760 mm/process_vm_access.c:205
 process_vm_rw+0x14e/0x1d0 mm/process_vm_access.c:286
 __do_sys_process_vm_readv mm/process_vm_access.c:300 [inline]
 __se_sys_process_vm_readv mm/process_vm_access.c:296 [inline]
 __x64_sys_process_vm_readv+0x76/0x90 mm/process_vm_access.c:296
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6704 Comm: syz-executor.0 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/08/05 07:45 upstream c0842fbc1b18 02034dac .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.