syzbot

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BUG: KCSAN: data-race in sg_common_write / sg_finish_rem_req

write to 0xffff88811a71931d of 1 bytes by task 3423 on cpu 1:
 sg_unlink_reserve drivers/scsi/sg.c:2059 [inline]
 sg_finish_rem_req+0x11f/0x270 drivers/scsi/sg.c:1841
 sg_rq_end_io_usercontext+0x38/0x1c0 drivers/scsi/sg.c:1301
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3340
 worker_thread+0x582/0x770 kernel/workqueue.c:3421
 kthread+0x489/0x510 kernel/kthread.c:463
 ret_from_fork+0x149/0x290 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

read to 0xffff88811a71931d of 1 bytes by task 22907 on cpu 0:
 sg_start_req drivers/scsi/sg.c:1781 [inline]
 sg_common_write+0x961/0xc30 drivers/scsi/sg.c:799
 sg_new_write+0x7b6/0x890 drivers/scsi/sg.c:766
 sg_ioctl_common drivers/scsi/sg.c:931 [inline]
 sg_ioctl+0xb81/0x1360 drivers/scsi/sg.c:1156
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583
 x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 22907 Comm: syz.8.7266 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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