syzbot

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BUG: KCSAN: data-race in sg_common_write / sg_finish_rem_req

write to 0xffff8881085ff31d of 1 bytes by task 11746 on cpu 1:
 sg_unlink_reserve drivers/scsi/sg.c:2067 [inline]
 sg_finish_rem_req+0x117/0x260 drivers/scsi/sg.c:1849
 sg_new_read+0x2e0/0x330 drivers/scsi/sg.c:593
 sg_ioctl_common drivers/scsi/sg.c:945 [inline]
 sg_ioctl+0x1701/0x1870 drivers/scsi/sg.c:1160
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881085ff31d of 1 bytes by task 11745 on cpu 0:
 sg_start_req drivers/scsi/sg.c:1789 [inline]
 sg_common_write+0x666/0x8e0 drivers/scsi/sg.c:803
 sg_write+0x699/0x710 drivers/scsi/sg.c:707
 vfs_write+0x27a/0x7d0 fs/read_write.c:582
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11745 Comm: syz-executor.5 Tainted: G        W          6.6.0-rc6-syzkaller-00207-gc8045b4a33a5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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