loop4: unable to read partition table
==================================================================
BUG: KCSAN: data-race in blkdev_llseek / set_capacity_and_notify

write to 0xffff888101fd34a0 of 8 bytes by task 30397 on cpu 1:
 i_size_write include/linux/fs.h:886 [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:237
 loop_configure+0xb1b/0xc30 drivers/block/loop.c:1100
 lo_ioctl+0x641/0x1290
 blkdev_ioctl+0x20e/0x440 block/ioctl.c:614
 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+0x63/0xcd

read to 0xffff888101fd34a0 of 8 bytes by task 2136 on cpu 0:
 i_size_read include/linux/fs.h:864 [inline]
 blkdev_llseek+0x4c/0x80 block/fops.c:438
 vfs_llseek fs/read_write.c:289 [inline]
 ksys_lseek fs/read_write.c:302 [inline]
 __do_sys_lseek fs/read_write.c:313 [inline]
 __se_sys_lseek fs/read_write.c:311 [inline]
 __x64_sys_lseek+0xdf/0x140 fs/read_write.c:311
 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+0x63/0xcd

value changed: 0x0000000000000000 -> 0x0000000008100000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2136 Comm: udevd Not tainted 6.0.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
==================================================================
buffer_io_error: 121 callbacks suppressed
Buffer I/O error on dev loop4, logical block 0, async page read
Buffer I/O error on dev loop4, logical block 0, async page read
Buffer I/O error on dev loop4, logical block 0, async page read
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop5, logical block 0, async page read
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop4, logical block 0, async page read
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop4, logical block 0, async page read
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop4, logical block 0, async page read
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop4, logical block 0, async page read
 loop4: unable to read partition table
 loop5: unable to read partition table
buffer_io_error: 4 callbacks suppressed
Buffer I/O error on dev loop5, logical block 0, async page read
Buffer I/O error on dev loop5, logical block 0, async page read
Buffer I/O error on dev loop5, logical block 0, async page read
 loop5: unable to read partition table
Buffer I/O error on dev loop5, logical block 0, async page read
Buffer I/O error on dev loop4, logical block 0, async page read
blk_print_req_error: 12 callbacks suppressed
I/O error, dev loop4, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2