syzbot

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BUG: KCSAN: data-race in do_mq_timedreceive / msg_insert

write to 0xffff888104782458 of 8 bytes by task 10469 on cpu 0:
 msg_insert+0x10a/0x2e0 ipc/mqueue.c:212
 do_mq_timedsend+0x471/0xa10 ipc/mqueue.c:1161
 __do_sys_mq_timedsend ipc/mqueue.c:1294 [inline]
 __se_sys_mq_timedsend ipc/mqueue.c:1283 [inline]
 __x64_sys_mq_timedsend+0xca/0x150 ipc/mqueue.c:1283
 x64_sys_call+0xcd7/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:243
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104782458 of 8 bytes by task 10467 on cpu 1:
 do_mq_timedreceive+0x207/0x6e0 ipc/mqueue.c:1230
 __do_sys_mq_timedreceive ipc/mqueue.c:1308 [inline]
 __se_sys_mq_timedreceive ipc/mqueue.c:1297 [inline]
 __x64_sys_mq_timedreceive+0xca/0x150 ipc/mqueue.c:1297
 x64_sys_call+0x2c3f/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:244
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff88811739fec0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10467 Comm: syz-executor.4 Tainted: G        W          6.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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