syzbot


KCSAN: data-race in block_read_full_page / set_capacity_and_notify

Status: auto-closed as invalid on 2022/06/03 04:24
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 222d, last: 222d

Sample crash report:
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
==================================================================
BUG: KCSAN: data-race in block_read_full_page / set_capacity_and_notify

write to 0xffff888100421ad8 of 8 bytes by task 4253 on cpu 1:
 i_size_write include/linux/fs.h:878 [inline]
 set_capacity block/genhd.c:63 [inline]
 set_capacity_and_notify+0x9d/0x1d0 block/genhd.c:78
 loop_set_size+0x2e/0x70 drivers/block/loop.c:233
 loop_configure+0xb66/0xc90 drivers/block/loop.c:1059
 lo_ioctl+0x617/0x11b0
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:588
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100421ad8 of 8 bytes by task 17531 on cpu 0:
 i_size_read include/linux/fs.h:856 [inline]
 block_read_full_page+0xc4/0x7b0 fs/buffer.c:2268
 blkdev_readpage+0x18/0x20 block/fops.c:392
 filemap_read_folio mm/filemap.c:2422 [inline]
 filemap_update_page mm/filemap.c:2504 [inline]
 filemap_get_pages mm/filemap.c:2616 [inline]
 filemap_read+0xaed/0x1400 mm/filemap.c:2679
 blkdev_read_iter+0x2c6/0x370 block/fops.c:611
 call_read_iter include/linux/fs.h:2044 [inline]
 new_sync_read fs/read_write.c:401 [inline]
 vfs_read+0x5a5/0x6a0 fs/read_write.c:482
 ksys_read+0xe8/0x1a0 fs/read_write.c:620
 __do_sys_read fs/read_write.c:630 [inline]
 __se_sys_read fs/read_write.c:628 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:628
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x00000000007ffe00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 17531 Comm: udevd Not tainted 5.18.0-rc4-syzkaller-00083-g259b897e5a79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
I/O error, dev loop1, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 16128 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop4, logical block 16128, async page read
I/O error, dev loop4, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Buffer I/O error on dev loop4, logical block 0, async page read
I/O error, dev loop4, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
I/O error, dev loop1, sector 16128 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-kcsan-gce 2022/04/29 04:14 upstream 259b897e5a79 e9076525 .config log report info KCSAN: data-race in block_read_full_page / set_capacity_and_notify
* Struck through repros no longer work on HEAD.