loop1: unable to read partition table
==================================================================
BUG: KCSAN: data-race in blkdev_llseek / set_capacity_and_notify

write to 0xffff8881020b5460 of 8 bytes by task 27964 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:1095
 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 0xffff8881020b5460 of 8 bytes by task 1916 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 -> 0x0000000000017000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1916 Comm: udevd Tainted: G        W          6.0.0-rc1-syzkaller-00340-g50cd95ac4654-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
==================================================================
 loop0: unable to read partition table
 loop5: unable to read partition table
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop2, logical block 0, async page read
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop2, logical block 0, async page read
I/O error, dev loop1, sector 24 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop2, logical block 0, async page read
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop2, logical block 0, async page read
Buffer I/O error on dev loop2, logical block 0, async page read
Buffer I/O error on dev loop0, logical block 0, async page read
 loop0: unable to read partition table
 loop1: unable to read partition table
 loop1: unable to read partition table
 loop1: unable to read partition table
 loop5: unable to read partition table
 loop1: unable to read partition table
 loop1: unable to read partition table
 loop2: unable to read partition table
 loop5: unable to read partition table
 loop2: unable to read partition table
 loop2: unable to read partition table
blk_print_req_error: 45 callbacks suppressed
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
buffer_io_error: 42 callbacks suppressed
Buffer I/O error on dev loop5, logical block 0, async page read
I/O error, dev loop5, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop5, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop5, logical block 1, async page read
I/O error, dev loop0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop0, logical block 1, async page read
I/O error, dev loop2, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 2
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2
Buffer I/O error on dev loop0, logical block 0, async page read