syzbot


KCSAN: data-race in packet_do_bind / packet_getname (4)

Status: auto-closed as invalid on 2021/03/06 13:33
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+a7e88feac4411e409be4@syzkaller.appspotmail.com
First crash: 1224d, last: 1143d
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in packet_do_bind / packet_getname net 16 1508d 1606d 0/26 auto-closed as invalid on 2020/04/11 02:48
upstream KCSAN: data-race in packet_do_bind / packet_getname (5) net 4 1007d 1007d 20/26 fixed on 2021/11/10 00:50
upstream KCSAN: data-race in packet_do_bind / packet_getname (3) net 8 1291d 1329d 0/26 auto-closed as invalid on 2020/10/09 06:50
upstream KCSAN: data-race in packet_do_bind / packet_getname (2) net 2 1400d 1422d 0/26 closed as invalid on 2020/06/18 14:24

Sample crash report:
==================================================================
BUG: KCSAN: data-race in packet_do_bind / packet_getname

write to 0xffff88810e580cd4 of 4 bytes by task 13566 on cpu 0:
 packet_do_bind+0x3d9/0x700 net/packet/af_packet.c:3182
 packet_bind+0xc3/0xd0 net/packet/af_packet.c:3246
 __sys_bind+0x200/0x290 net/socket.c:1635
 __do_sys_bind net/socket.c:1646 [inline]
 __se_sys_bind net/socket.c:1644 [inline]
 __x64_sys_bind+0x3d/0x50 net/socket.c:1644
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810e580cd4 of 4 bytes by task 13594 on cpu 1:
 packet_getname+0xba/0x1a0 net/packet/af_packet.c:3520
 __sys_getsockname+0x10e/0x1a0 net/socket.c:1885
 __do_sys_getsockname net/socket.c:1900 [inline]
 __se_sys_getsockname net/socket.c:1897 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1897
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13594 Comm: syz-executor.5 Not tainted 5.11.0-rc5-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: 13594 Comm: syz-executor.5 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x116/0x15d lib/dump_stack.c:120
 panic+0x1e7/0x5fa kernel/panic.c:231
 kcsan_report+0x67b/0x680 kernel/kcsan/report.c:634
 kcsan_setup_watchpoint+0x472/0x4d0 kernel/kcsan/core.c:568
 packet_getname+0xba/0x1a0 net/packet/af_packet.c:3520
 __sys_getsockname+0x10e/0x1a0 net/socket.c:1885
 __do_sys_getsockname net/socket.c:1900 [inline]
 __se_sys_getsockname net/socket.c:1897 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1897
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4990e35188 EFLAGS: 00000246 ORIG_RAX: 0000000000000033
RAX: ffffffffffffffda RBX: 000000000056c200 RCX: 0000000000465b09
RDX: 0000000020000340 RSI: 00000000200003c0 RDI: 000000000000000a
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c200
R13: 00007fff303fda9f R14: 00007f4990e35300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/01/30 13:32 upstream 0e9bcda5d286 fc9fd31e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in packet_do_bind / packet_getname
2021/01/17 05:47 upstream 54c6247d06f1 65a7a854 .config console log report info ci2-upstream-kcsan-gce
2021/01/07 05:18 upstream 71c061d24438 c104d4a3 .config console log report info ci2-upstream-kcsan-gce
2020/12/21 07:24 upstream 6a447b0e3151 04201c06 .config console log report info ci2-upstream-kcsan-gce
2020/11/10 16:23 upstream 407ab579637c cca87986 .config console log report info ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.