active_anon 4096 inactive_file 0 active_file 0 ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86c82ca8 of 8 bytes by task 12623 on cpu 0: data_alloc+0x2fc/0x380 kernel/printk/printk_ringbuffer.c:1129 prb_reserve+0x8e3/0xaf0 kernel/printk/printk_ringbuffer.c:1727 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 __ext4_error_inode+0x298/0x3a0 fs/ext4/super.c:861 __ext4_iget+0x10f5/0x2400 fs/ext4/inode.c:-1 ext4_lookup+0x173/0x3a0 fs/ext4/namei.c:1785 __lookup_slow+0x155/0x200 fs/namei.c:1919 lookup_slow+0x3c/0x60 fs/namei.c:1936 walk_component fs/namei.c:2282 [inline] lookup_last fs/namei.c:2789 [inline] path_lookupat+0x2b2/0x4c0 fs/namei.c:2813 filename_lookup+0x18f/0x390 fs/namei.c:2842 vfs_statx+0x96/0x170 fs/stat.c:353 vfs_fstatat+0x118/0x170 fs/stat.c:373 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532 x64_sys_call+0x2c64/0x3020 arch/x86/include/generated/asm/syscalls_64.h:263 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c82ca8 of 16 bytes by task 21735 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1934 [inline] prb_read kernel/printk/printk_ringbuffer.c:1982 [inline] _prb_read_valid+0x183/0x930 kernel/printk/printk_ringbuffer.c:2173 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2245 printk_get_next_message+0xea/0x550 kernel/printk/printk.c:3052 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x2bc/0x6b0 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xa1/0x280 kernel/printk/printk.c:3413 vprintk_emit+0x3e4/0x600 kernel/printk/printk.c:2479 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2504 seq_buf_do_printk+0x113/0x1a0 lib/seq_buf.c:126 mem_cgroup_print_oom_meminfo+0x17d/0x260 mm/memcontrol.c:1829 dump_header+0xa2/0x240 mm/oom_kill.c:466 oom_kill_process+0x295/0x350 mm/oom_kill.c:1031 out_of_memory+0x981/0xbc0 mm/oom_kill.c:1169 mem_cgroup_out_of_memory mm/memcontrol.c:1907 [inline] mem_cgroup_oom mm/memcontrol.c:1930 [inline] try_charge_memcg+0x621/0xa00 mm/memcontrol.c:2697 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline] __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321 alloc_pages_mpol+0xa9/0x1d0 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581 vm_area_alloc_pages mm/vmalloc.c:3742 [inline] __vmalloc_area_node mm/vmalloc.c:3892 [inline] __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995 __do_sys_prctl kernel/sys.c:2885 [inline] __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 21735 Comm: syz.5.5406 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 ================================================================== unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 0 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 0 total_workingset_refault_anon 235 total_workingset_refault_file 2940 total_swap 12156928 total_swapcached 56524800 total_pgpgin 450820 total_pgpgout 450819 total_pgfault 446143 total_pgmajfault 149 total_inactive_anon 0 total_active_anon 4096 total_inactive_file 0 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz5,task_memcg=/syz5,task=syz.5.5406,pid=21734,uid=0 Memory cgroup out of memory: Killed process 21734 (syz.5.5406) total-vm:94312kB, anon-rss:1236kB, file-rss:22560kB, shmem-rss:0kB, UID:0 pgtables:124kB oom_score_adj:1000