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BUG: KCSAN: data-race in sg_common_write / sg_finish_rem_req

write to 0xffff88812a64b31d of 1 bytes by task 3338 on cpu 1:
 sg_unlink_reserve drivers/scsi/sg.c:2069 [inline]
 sg_finish_rem_req+0x117/0x270 drivers/scsi/sg.c:1851
 sg_rq_end_io_usercontext+0x36/0x1c0 drivers/scsi/sg.c:1309
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x6e0 kernel/workqueue.c:3389
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff88812a64b31d of 1 bytes by task 5959 on cpu 0:
 sg_start_req drivers/scsi/sg.c:1791 [inline]
 sg_common_write+0x659/0x8d0 drivers/scsi/sg.c:806
 sg_new_write+0x82b/0x8e0 drivers/scsi/sg.c:773
 sg_ioctl_common drivers/scsi/sg.c:938 [inline]
 sg_ioctl+0xe28/0x1870 drivers/scsi/sg.c:1163
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5959 Comm: syz.3.622 Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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