loop2: p1 < > p4 loop2: p4 size 8388608 extends beyond EOD, ================================================================== BUG: KCSAN: data-race in data_push_tail / string write to 0xffffffff88b9b238 of 1 bytes by task 7452 on cpu 1: string_nocheck lib/vsprintf.c:650 [inline] string+0x16c/0x210 lib/vsprintf.c:728 vsnprintf+0xa09/0xe30 lib/vsprintf.c:2803 vscnprintf+0x42/0x90 lib/vsprintf.c:2909 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2197 vprintk_store+0x570/0x810 kernel/printk/printk.c:2311 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68 _printk+0x7a/0xa0 kernel/printk/printk.c:2432 __ext4_error_inode+0x2da/0x400 fs/ext4/super.c:854 __ext4_read_dirblock+0x108/0x5e0 ext4_empty_dir+0x14a/0x5a0 fs/ext4/namei.c:3090 ext4_rmdir+0x1b4/0x600 fs/ext4/namei.c:3173 vfs_rmdir+0x270/0x320 fs/namei.c:4340 do_rmdir+0x194/0x320 fs/namei.c:4399 __do_sys_unlinkat fs/namei.c:4575 [inline] __se_sys_unlinkat fs/namei.c:4569 [inline] __x64_sys_unlinkat+0xa2/0xb0 fs/namei.c:4569 x64_sys_call+0x25fd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff88b9b238 of 8 bytes by task 7600 on cpu 0: data_make_reusable kernel/printk/printk_ringbuffer.c:594 [inline] data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:679 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1054 prb_reserve+0x85e/0xb60 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x53f/0x810 kernel/printk/printk.c:2301 vprintk_emit+0x15e/0x680 kernel/printk/printk.c:2383 vprintk_default+0x26/0x30 kernel/printk/printk.c:2422 vprintk+0x75/0x80 kernel/printk/printk_safe.c:68 _printk+0x7a/0xa0 kernel/printk/printk.c:2432 blk_add_partition block/partitions/core.c:541 [inline] blk_add_partitions block/partitions/core.c:625 [inline] bdev_disk_changed+0x87f/0xb90 block/partitions/core.c:685 loop_reread_partitions drivers/block/loop.c:534 [inline] loop_set_status+0x4a5/0x540 drivers/block/loop.c:1303 lo_ioctl+0x7f1/0x11c0 blkdev_ioctl+0x359/0x450 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xcd/0x140 fs/ioctl.c:893 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffff07f -> 0x7974706d655f3474 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 7600 Comm: syz.2.1122 Not tainted 6.12.0-rc4-syzkaller-00045-gd12937763990 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ================================================================== truncated