loop1: detected capacity change from 0 to 1051 EXT4-fs (loop1): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) ================================================================== BUG: KCSAN: data-race in pcpu_alloc / pcpu_free_area write to 0xffffffff8455f74c of 4 bytes by task 26383 on cpu 0: pcpu_update_empty_pages mm/percpu.c:559 [inline] pcpu_block_update_hint_free mm/percpu.c:994 [inline] pcpu_free_area+0x50c/0x5a0 mm/percpu.c:1254 free_percpu+0x1d2/0x690 mm/percpu.c:2102 perf_trace_event_unreg+0x193/0x1d0 kernel/trace/trace_event_perf.c:175 perf_trace_destroy+0x59/0x70 kernel/trace/trace_event_perf.c:243 tp_perf_event_destroy+0x11/0x20 kernel/events/core.c:9708 _free_event+0x7db/0x9a0 kernel/events/core.c:4949 put_event kernel/events/core.c:5043 [inline] perf_event_release_kernel+0x7bc/0x830 kernel/events/core.c:5158 perf_release+0x21/0x30 kernel/events/core.c:5168 __fput+0x25b/0x4e0 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0xae/0x130 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffffff8455f74c of 4 bytes by task 26386 on cpu 1: pcpu_alloc+0xa33/0x1200 mm/percpu.c:1835 __alloc_percpu_gfp+0x22/0x30 mm/percpu.c:1894 __percpu_counter_init+0x43/0x130 lib/percpu_counter.c:149 ext4_es_register_shrinker+0x103/0x1f0 fs/ext4/extents_status.c:1649 ext4_fill_super+0x4392/0x8010 fs/ext4/super.c:4723 mount_bdev+0x1e8/0x290 fs/super.c:1368 ext4_mount+0x2d/0x40 fs/ext4/super.c:6632 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x11d4/0x1ce0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 26386 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== EXT4-fs (loop1): orphan cleanup on readonly fs EXT4-fs error (device loop1): ext4_free_inode:282: comm syz-executor.1: reserved or nonexistent inode 3 EXT4-fs warning (device loop1): ext4_enable_quotas:6472: Failed to enable quota tracking (type=0, err=-22). Please run e2fsck to fix. EXT4-fs (loop1): Cannot turn on quotas: error -22 EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.