syzbot

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BUG: KCSAN: data-race in sg_common_write / sg_finish_rem_req

write to 0xffff888117b7b31d of 1 bytes by task 3407 on cpu 1:
 sg_unlink_reserve drivers/scsi/sg.c:2062 [inline]
 sg_finish_rem_req+0x11f/0x270 drivers/scsi/sg.c:1844
 sg_rq_end_io_usercontext+0x38/0x1c0 drivers/scsi/sg.c:1303
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0x4de/0x9e0 kernel/workqueue.c:3358
 worker_thread+0x581/0x770 kernel/workqueue.c:3439
 kthread+0x22a/0x280 kernel/kthread.c:467
 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

read to 0xffff888117b7b31d of 1 bytes by task 5818 on cpu 0:
 sg_start_req drivers/scsi/sg.c:1784 [inline]
 sg_common_write+0x952/0xc80 drivers/scsi/sg.c:802
 sg_new_write+0x7e4/0x8c0 drivers/scsi/sg.c:769
 sg_ioctl_common drivers/scsi/sg.c:933 [inline]
 sg_ioctl+0xbf8/0x1350 drivers/scsi/sg.c:1158
 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+0x1563/0x3020 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 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: 5818 Comm: syz.0.574 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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