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KCSAN: data-race in sg_common_write / sg_finish_rem_req (2)

Status: moderation: reported on 2024/06/22 17:57
Subsystems: scsi
[Documentation on labels]
Reported-by: syzbot+c1c2a596fa01d826a550@syzkaller.appspotmail.com
First crash: 26d, last: 26d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in sg_common_write / sg_finish_rem_req scsi 3 272d 305d 0/27 auto-obsoleted due to no activity on 2023/11/25 03:57

Sample crash report:
==================================================================
BUG: KCSAN: data-race in sg_common_write / sg_finish_rem_req

write to 0xffff8881188c531d of 1 bytes by task 28922 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+0x526/0x730 kernel/workqueue.c:3393
 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 0xffff8881188c531d of 1 bytes by task 10612 on cpu 0:
 sg_start_req drivers/scsi/sg.c:1791 [inline]
 sg_common_write+0x66a/0x8e0 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+0x1581/0x2d70 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 PID: 10612 Comm: syz-executor.1 Tainted: G        W          6.10.0-rc4-syzkaller-00217-g35bb670d65fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/22 17:56 upstream 35bb670d65fc edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in sg_common_write / sg_finish_rem_req
* Struck through repros no longer work on HEAD.