__dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x263/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4491 [inline] slab_alloc_node mm/slub.c:4843 [inline] kmem_cache_alloc_noprof+0x66/0x400 mm/slub.c:4873 ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86c92908 of 8 bytes by task 32377 on cpu 0: data_alloc+0x310/0x390 kernel/printk/printk_ringbuffer.c:1129 prb_reserve+0x8d7/0xae0 kernel/printk/printk_ringbuffer.c:1724 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 caif_disconnect_client+0x13d/0x150 net/caif/cfcnfg.c:194 caif_release+0xec/0x250 net/caif/caif_socket.c:918 __sock_release net/socket.c:662 [inline] sock_close+0x6b/0x150 net/socket.c:1455 __fput+0x29b/0x650 fs/file_table.c:469 ____fput+0x1c/0x30 fs/file_table.c:497 task_work_run+0x130/0x1a0 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x1f4/0x6f0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x249/0x370 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86c92908 of 16 bytes by task 32388 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1931 [inline] prb_read kernel/printk/printk_ringbuffer.c:1979 [inline] _prb_read_valid+0x1bc/0x950 kernel/printk/printk_ringbuffer.c:2170 desc_update_last_finalized+0x8f/0x170 kernel/printk/printk_ringbuffer.c:1570 prb_final_commit+0x10d/0x150 kernel/printk/printk_ringbuffer.c:1839 vprintk_store+0x88b/0x910 kernel/printk/printk.c:2381 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 printk_stack_address arch/x86/kernel/dumpstack.c:70 [inline] __show_trace_log_lvl+0x460/0x560 arch/x86/kernel/dumpstack.c:282 __dump_stack+0x1d/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x95/0xd0 lib/dump_stack.c:120 dump_stack+0x15/0x1b lib/dump_stack.c:129 fail_dump lib/fault-inject.c:73 [inline] should_fail_ex+0x263/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4491 [inline] slab_alloc_node mm/slub.c:4843 [inline] kmem_cache_alloc_noprof+0x66/0x400 mm/slub.c:4873 ioctx_alloc+0xe3/0x4c0 fs/aio.c:765 __do_sys_io_setup fs/aio.c:1398 [inline] __se_sys_io_setup+0x6b/0x1b0 fs/aio.c:1381 __x64_sys_io_setup+0x31/0x40 fs/aio.c:1381 x64_sys_call+0x24f1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:207 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 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: 32388 Comm: syz.2.7101 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== ioctx_alloc+0xe3/0x4c0 fs/aio.c:765 __do_sys_io_setup fs/aio.c:1398 [inline] __se_sys_io_setup+0x6b/0x1b0 fs/aio.c:1381 __x64_sys_io_setup+0x31/0x40 fs/aio.c:1381 x64_sys_call+0x24f1/0x3020 arch/x86/include/generated/asm/syscalls_64.h:207 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feae452c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007feae2f87028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ce RAX: ffffffffffffffda RBX: 00007feae47a5fa0 RCX: 00007feae452c819 RDX: 0000000000000000 RSI: 0000200000008240 RDI: 0000000000000003 RBP: 00007feae2f87090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007feae47a6038 R14: 00007feae47a5fa0 R15: 00007ffeaeef4fe8