syzbot


KCSAN: data-race in sg_ioctl / sg_rq_end_io

Status: auto-closed as invalid on 2021/10/23 07:44
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 440d, last: 440d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in sg_ioctl / sg_rq_end_io (3) 1 101d 101d 0/24 auto-closed as invalid on 2022/09/27 16:29
upstream KCSAN: data-race in sg_ioctl / sg_rq_end_io (2) 2 336d 348d 0/24 auto-closed as invalid on 2022/02/04 08:07

Sample crash report:
==================================================================
BUG: KCSAN: data-race in sg_ioctl / sg_rq_end_io

write to 0xffff888107ee4111 of 1 bytes by interrupt on cpu 1:
 sg_rq_end_io+0x19a/0x750 drivers/scsi/sg.c:1357
 __blk_mq_end_request+0x224/0x230 block/blk-mq.c:556
 scsi_end_request+0x28c/0x440 drivers/scsi/scsi_lib.c:576
 scsi_io_completion+0xd0/0x10c0 drivers/scsi/scsi_lib.c:938
 scsi_finish_command+0x1ba/0x1d0 drivers/scsi/scsi.c:207
 scsi_complete+0x1aa/0x1e0 drivers/scsi/scsi_lib.c:1432
 blk_complete_reqs block/blk-mq.c:577 [inline]
 blk_done_softirq+0x69/0x90 block/blk-mq.c:582
 __do_softirq+0x12c/0x26e kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu kernel/softirq.c:636 [inline]
 irq_exit_rcu+0x4e/0xa0 kernel/softirq.c:648
 common_interrupt+0x78/0x90 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40
 check_access kernel/kcsan/core.c:631 [inline]
 __tsan_read4+0x108/0x180 kernel/kcsan/core.c:854
 crc32_body lib/crc32.c:106 [inline]
 crc32_le_generic lib/crc32.c:179 [inline]
 __crc32c_le_base+0x99/0x350 lib/crc32.c:202
 chksum_update+0x2e/0x50 crypto/crc32c_generic.c:88
 crypto_shash_update+0x13c/0x1a0 crypto/shash.c:131
 ext4_chksum fs/ext4/ext4.h:2452 [inline]
 ext4_block_bitmap_csum_set+0x12b/0x250 fs/ext4/bitmap.c:94
 ext4_free_blocks+0x1534/0x1c20 fs/ext4/mballoc.c:6066
 ext4_remove_blocks+0x61a/0x800 fs/ext4/extents.c:2506
 ext4_ext_rm_leaf+0x684/0xd40 fs/ext4/extents.c:2672
 ext4_ext_remove_space+0x8f6/0x12b0 fs/ext4/extents.c:2920
 ext4_ext_truncate+0xfe/0x170 fs/ext4/extents.c:4382
 ext4_truncate+0x76e/0xa80 fs/ext4/inode.c:4268
 ext4_evict_inode+0xa54/0xdb0 fs/ext4/inode.c:287
 evict+0x1c8/0x3c0 fs/inode.c:586
 iput_final fs/inode.c:1662 [inline]
 iput+0x430/0x580 fs/inode.c:1688
 dentry_unlink_inode+0x273/0x290 fs/dcache.c:376
 d_delete+0x78/0xe0 fs/dcache.c:2505
 vfs_rmdir+0x2e6/0x300 fs/namei.c:3984
 do_rmdir+0x18d/0x330 fs/namei.c:4032
 __do_sys_rmdir fs/namei.c:4051 [inline]
 __se_sys_rmdir fs/namei.c:4049 [inline]
 __x64_sys_rmdir+0x2c/0x30 fs/namei.c:4049
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888107ee4111 of 1 bytes by task 9289 on cpu 0:
 sg_fill_request_table drivers/scsi/sg.c:872 [inline]
 sg_ioctl_common drivers/scsi/sg.c:1091 [inline]
 sg_ioctl+0x7ca/0x18e0 drivers/scsi/sg.c:1164
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9289 Comm: syz-executor.0 Not tainted 5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2021/09/18 07:44 upstream 4357f03d6611 70b76c1d .config log report info KCSAN: data-race in sg_ioctl / sg_rq_end_io
* Struck through repros no longer work on HEAD.