TITLE: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
TYPE: KCSAN-DATARACE
PANICKED: Y

[  472.478762][T19789] ==================================================================
[  472.486894][T19789] BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg
[  472.494249][T19789] 
[  472.496603][T19789] write to 0xffff8880b588efb2 of 2 bytes by task 19788 on cpu 0:
[  472.504348][T19789]  netlink_recvmsg+0x196/0x910
[  472.509121][T19789]  sock_recvmsg_nosec+0x5c/0x70
[  472.513990][T19789]  ___sys_recvmsg+0x1a0/0x3e0
[  472.518791][T19789]  do_recvmmsg+0x19a/0x5c0
[  472.523196][T19789]  __sys_recvmmsg+0x1ef/0x200
[  472.527980][T19789]  __x64_sys_recvmmsg+0x89/0xb0
[  472.532862][T19789]  do_syscall_64+0xcc/0x370
[  472.537395][T19789]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  472.543289][T19789] 
[  472.545632][T19789] write to 0xffff8880b588efb2 of 2 bytes by task 19789 on cpu 1:
[  472.553375][T19789]  netlink_recvmsg+0x196/0x910
[  472.558178][T19789]  sock_recvmsg+0x92/0xb0
[  472.562518][T19789]  __sys_recvfrom+0x1ae/0x2d0
[  472.567200][T19789]  __x64_sys_recvfrom+0x89/0xb0
[  472.572077][T19789]  do_syscall_64+0xcc/0x370
[  472.576596][T19789]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  472.582493][T19789] 
[  472.584823][T19789] Reported by Kernel Concurrency Sanitizer on:
[  472.591100][T19789] CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
[  472.599001][T19789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  472.609194][T19789] ==================================================================
[  472.617280][T19789] Kernel panic - not syncing: panic_on_warn set ...
[  472.623912][T19789] CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
[  472.631819][T19789] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  472.641880][T19789] Call Trace:
[  472.645181][T19789]  dump_stack+0xf5/0x159
[  472.649446][T19789]  panic+0x210/0x640
[  472.654132][T19789]  ? vprintk_func+0x8d/0x140
[  472.658728][T19789]  kcsan_report.cold+0xc/0xe
[  472.663325][T19789]  kcsan_setup_watchpoint+0x3fe/0x410
[  472.668711][T19789]  __tsan_unaligned_write2+0x143/0x1f0
[  472.674172][T19789]  netlink_recvmsg+0x196/0x910
[  472.694611][T19789]  sock_recvmsg+0x92/0xb0
[  472.698945][T19789]  __sys_recvfrom+0x1ae/0x2d0
[  472.730069][T19789]  __x64_sys_recvfrom+0x89/0xb0
[  472.735015][T19789]  do_syscall_64+0xcc/0x370
[  472.739525][T19789]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  472.745411][T19789] RIP: 0033:0x45a219
[  472.749313][T19789] 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
[  472.768910][T19789] RSP: 002b:00007f580a978c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
[  472.777579][T19789] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045a219
[  472.785564][T19789] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
[  472.794320][T19789] RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
[  472.802300][T19789] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f580a9796d4
[  472.810544][T19789] R13: 00000000004c7c59 R14: 00000000004ddd80 R15: 00000000ffffffff
[  472.819997][T19789] Kernel Offset: disabled
[  472.824338][T19789] Rebooting in 86400 seconds..

REPORT:
==================================================================
BUG: KCSAN: data-race in netlink_recvmsg / netlink_recvmsg

write to 0xffff8880b588efb2 of 2 bytes by task 19788 on cpu 0:
 netlink_recvmsg+0x196/0x910
 sock_recvmsg_nosec+0x5c/0x70
 ___sys_recvmsg+0x1a0/0x3e0
 do_recvmmsg+0x19a/0x5c0
 __sys_recvmmsg+0x1ef/0x200
 __x64_sys_recvmmsg+0x89/0xb0
 do_syscall_64+0xcc/0x370
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8880b588efb2 of 2 bytes by task 19789 on cpu 1:
 netlink_recvmsg+0x196/0x910
 sock_recvmsg+0x92/0xb0
 __sys_recvfrom+0x1ae/0x2d0
 __x64_sys_recvfrom+0x89/0xb0
 do_syscall_64+0xcc/0x370
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19789 Comm: syz-executor.0 Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
