loop7: p3 start 18548 is beyond EOD, ================================================================== BUG: KCSAN: data-race in _prb_read_valid / prb_reserve write to 0xffffffff86909b80 of 88 bytes by task 19101 on cpu 0: prb_reserve+0x696/0xaf0 kernel/printk/printk_ringbuffer.c:1635 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 blk_add_partition block/partitions/core.c:540 [inline] blk_add_partitions block/partitions/core.c:633 [inline] bdev_disk_changed+0x821/0xcb0 block/partitions/core.c:693 loop_reread_partitions drivers/block/loop.c:436 [inline] loop_set_status+0x516/0x5c0 drivers/block/loop.c:1263 lo_ioctl+0x75b/0x15d0 drivers/block/loop.c:-1 blkdev_ioctl+0x352/0x440 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:892 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892 x64_sys_call+0x19a8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86909b80 of 8 bytes by task 19108 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:486 [inline] prb_first_seq kernel/printk/printk_ringbuffer.c:1957 [inline] _prb_read_valid+0x383/0x920 kernel/printk/printk_ringbuffer.c:2114 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185 __console_flush_and_unlock kernel/printk/printk.c:3304 [inline] console_unlock+0x164/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 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 blk_add_partition block/partitions/core.c:540 [inline] blk_add_partitions block/partitions/core.c:633 [inline] bdev_disk_changed+0x821/0xcb0 block/partitions/core.c:693 loop_reread_partitions drivers/block/loop.c:436 [inline] loop_set_status+0x516/0x5c0 drivers/block/loop.c:1263 lo_ioctl+0x75b/0x15d0 drivers/block/loop.c:-1 blkdev_ioctl+0x352/0x440 block/ioctl.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:892 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892 x64_sys_call+0x19a8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000000034b8 -> 0x00000000000054b8 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 19108 Comm: syz.7.11695 Not tainted 6.15.0-rc7-syzkaller-00099-g94305e83eccb #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ================================================================== truncated