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KCSAN: data-race in __x64_sys_ptrace / ptrace_stop (2)

Status: auto-closed as invalid on 2020/07/23 08:53
Subsystems: kasan
[Documentation on labels]
Reported-by: syzbot+829eea397372cc52d9b8@syzkaller.appspotmail.com
First crash: 1482d, last: 1402d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __x64_sys_ptrace / ptrace_stop kasan 2 1592d 1600d 0/26 auto-closed as invalid on 2020/02/19 07:06

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __x64_sys_ptrace / ptrace_stop

write to 0xffff8880b3564090 of 8 bytes by task 13679 on cpu 1:
 ptrace_stop+0x5e/0x4f0 kernel/signal.c:2145
 ptrace_do_notify+0xe7/0x110 kernel/signal.c:2268
 ptrace_notify+0x8c/0xc0 kernel/signal.c:2278
 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:85
 do_syscall_64+0x2ab/0x3b0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b3564090 of 8 bytes by task 13680 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: 13680 Comm: syz-executor.4 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: 13680 Comm: syz-executor.4 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: 0033:0x45ca59
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:00007f9242dd8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000065
RAX: ffffffffffffffda RBX: 00000000004fb2a0 RCX: 000000000045ca59
RDX: 0000000000000000 RSI: 0000000000000116 RDI: 0000000000000018
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000881 R14: 00000000004cb68f R15: 00007f9242dd96d4
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (60):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/18 08:52 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 d45a4d69 .config console log report ci2-upstream-kcsan-gce
2020/06/17 14:28 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b6c46f43 .config console log report ci2-upstream-kcsan-gce
2020/06/16 02:50 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 baca2611 .config console log report ci2-upstream-kcsan-gce
2020/06/14 16:51 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2a22c77a .config console log report ci2-upstream-kcsan-gce
2020/06/14 04:56 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a61674a5 .config console log report ci2-upstream-kcsan-gce
2020/06/13 16:36 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 dbce178a .config console log report ci2-upstream-kcsan-gce
2020/06/12 08:37 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 819b58b0 .config console log report ci2-upstream-kcsan-gce
2020/06/11 21:17 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 1beaee21 .config console log report ci2-upstream-kcsan-gce
2020/06/10 08:42 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 860c4de9 .config console log report ci2-upstream-kcsan-gce
2020/06/09 23:04 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 092934c1 .config console log report ci2-upstream-kcsan-gce
2020/06/09 04:14 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0d60b78a .config console log report ci2-upstream-kcsan-gce
2020/06/08 04:04 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 7751efd0 .config console log report ci2-upstream-kcsan-gce
2020/06/06 09:57 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 c3e9afb3 .config console log report ci2-upstream-kcsan-gce
2020/06/05 12:15 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2420d1bc .config console log report ci2-upstream-kcsan-gce
2020/06/04 20:58 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6720fdef .config console log report ci2-upstream-kcsan-gce
2020/06/04 10:32 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b0d1c0d5 .config console log report ci2-upstream-kcsan-gce
2020/06/03 22:43 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a5ce5de0 .config console log report ci2-upstream-kcsan-gce
2020/06/02 15:33 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 52fd7b7d .config console log report ci2-upstream-kcsan-gce
2020/05/31 16:41 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a0331e89 .config console log report ci2-upstream-kcsan-gce
2020/05/30 14:40 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6f3e1c7c .config console log report ci2-upstream-kcsan-gce
2020/05/30 12:17 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 954bd312 .config console log report ci2-upstream-kcsan-gce
2020/05/28 21:09 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 c7192a2f .config console log report ci2-upstream-kcsan-gce
2020/05/27 02:30 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9072c126 .config console log report ci2-upstream-kcsan-gce
2020/05/25 20:27 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 73964a9b .config console log report ci2-upstream-kcsan-gce
2020/05/25 05:27 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 11284182 .config console log report ci2-upstream-kcsan-gce
2020/05/24 18:40 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 ce7ca010 .config console log report ci2-upstream-kcsan-gce
2020/05/24 03:26 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 96c92ad3 .config console log report ci2-upstream-kcsan-gce
2020/05/23 01:28 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4afdfa20 .config console log report ci2-upstream-kcsan-gce
2020/05/20 21:59 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4afdfa20 .config console log report ci2-upstream-kcsan-gce
2020/05/19 23:09 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6d882fd2 .config console log report ci2-upstream-kcsan-gce
2020/05/19 05:28 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 684d3606 .config console log report ci2-upstream-kcsan-gce
2020/05/14 19:13 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2d572622 .config console log report ci2-upstream-kcsan-gce
2020/05/13 16:41 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9a6d42fb .config console log report ci2-upstream-kcsan-gce
2020/05/11 13:29 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 f8f57555 .config console log report ci2-upstream-kcsan-gce
2020/05/10 06:41 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 8742a2b9 .config console log report ci2-upstream-kcsan-gce
2020/05/09 18:37 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 88cb3e92 .config console log report ci2-upstream-kcsan-gce
2020/05/09 04:08 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e97b06d3 .config console log report ci2-upstream-kcsan-gce
2020/05/08 15:34 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 fe4122c3 .config console log report ci2-upstream-kcsan-gce
2020/05/08 02:56 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6c70a1c2 .config console log report ci2-upstream-kcsan-gce
2020/05/07 01:24 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4618eb2d .config console log report ci2-upstream-kcsan-gce
2020/05/06 02:42 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 35b8eb30 .config console log report ci2-upstream-kcsan-gce
2020/05/05 12:21 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4b76dd25 .config console log report ci2-upstream-kcsan-gce
2020/05/05 01:31 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9941337c .config console log report ci2-upstream-kcsan-gce
2020/05/05 01:24 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9941337c .config console log report ci2-upstream-kcsan-gce
2020/05/03 03:08 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 5457883a .config console log report ci2-upstream-kcsan-gce
2020/05/02 04:10 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 bc734e7a .config console log report ci2-upstream-kcsan-gce
2020/05/01 05:44 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 3698959a .config console log report ci2-upstream-kcsan-gce
2020/04/30 07:36 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2dd552a5 .config console log report ci2-upstream-kcsan-gce
2020/04/29 10:02 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 ba2806db .config console log report ci2-upstream-kcsan-gce
2020/04/28 16:18 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e3ecea2e .config console log report ci2-upstream-kcsan-gce
2020/04/26 11:54 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0ce7569e .config console log report ci2-upstream-kcsan-gce
2020/04/26 05:43 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b8bb8e5f .config console log report ci2-upstream-kcsan-gce
2020/04/24 08:43 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 03d97a1b .config console log report ci2-upstream-kcsan-gce
2020/04/23 20:48 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b9233cab .config console log report ci2-upstream-kcsan-gce
2020/04/23 07:42 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2e44d63e .config console log report ci2-upstream-kcsan-gce
2020/04/19 13:19 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6dfd45e1 .config console log report ci2-upstream-kcsan-gce
2020/04/18 17:41 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 365fba24 .config console log report ci2-upstream-kcsan-gce
2020/04/18 07:48 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 435c6d53 .config console log report ci2-upstream-kcsan-gce
2020/04/16 11:03 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 c743fcb3 .config console log report ci2-upstream-kcsan-gce
2020/03/29 13:31 https://github.com/google/ktsan.git kcsan 40959e34d670 05736b29 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.