loop1: p3 start 1912602624 is beyond EOD, 
truncated
==================================================================
BUG: KCSAN: data-race in data_push_tail / vsnprintf

write to 0xffffffff88e54320 of 14 bytes by task 18126 on cpu 1:
 vsnprintf+0x2ce/0x890 lib/vsprintf.c:2878
 vscnprintf+0x41/0x90 lib/vsprintf.c:2991
 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2216
 vprintk_store+0x599/0x860 kernel/printk/printk.c:2336
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 rock_check_overflow+0x1b7/0x1c0 fs/isofs/rock.c:188
 get_rock_ridge_filename+0x1df/0x5b0 fs/isofs/rock.c:228
 isofs_find_entry fs/isofs/namei.c:110 [inline]
 isofs_lookup+0x3c4/0x930 fs/isofs/namei.c:165
 __lookup_slow+0x190/0x250 fs/namei.c:1808
 lookup_slow+0x3c/0x60 fs/namei.c:1825
 walk_component+0x1ec/0x220 fs/namei.c:2129
 lookup_last fs/namei.c:2630 [inline]
 path_lookupat+0xfe/0x2a0 fs/namei.c:2654
 filename_lookup+0x147/0x340 fs/namei.c:2683
 filename_setxattr+0x56/0x400 fs/xattr.c:660
 path_setxattrat+0x2c9/0x310 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0x71/0x90 fs/xattr.c:750
 x64_sys_call+0x2877/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:190
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff88e54328 of 8 bytes by task 18119 on cpu 0:
 data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline]
 data_push_tail+0xfd/0x420 kernel/printk/printk_ringbuffer.c:679
 data_alloc+0xbf/0x2b0 kernel/printk/printk_ringbuffer.c:1054
 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669
 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326
 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2475
 disk_unlock_native_capacity block/partitions/core.c:520 [inline]
 blk_add_partition block/partitions/core.c:543 [inline]
 blk_add_partitions block/partitions/core.c:633 [inline]
 bdev_disk_changed+0x950/0xcb0 block/partitions/core.c:693
 loop_reread_partitions drivers/block/loop.c:439 [inline]
 loop_set_status+0x541/0x5f0 drivers/block/loop.c:1265
 loop_set_status64 drivers/block/loop.c:1361 [inline]
 lo_ioctl+0x68f/0x1350 drivers/block/loop.c:1547
 blkdev_ioctl+0x34f/0x440 block/ioctl.c:705
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:584
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:584
 x64_sys_call+0x1816/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000010000068d -> 0x3035663478303d67

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 18119 Comm: syz.1.5251 Tainted: G        W           6.16.0-syzkaller-12245-g2988dfed8a5d #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
==================================================================
loop1: p4 size 656640 extends beyond EOD, truncated