swap_cache_alloc_folio+0xa2/0x120 mm/swap_state.c:575 swap_cluster_readahead+0x26e/0x3d0 mm/swap_state.c:749 swapin_readahead+0xde/0x840 mm/swap_state.c:924 ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86c8c300 of 8 bytes by task 28 on cpu 1: data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130 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 kauditd_printk_skb kernel/audit.c:587 [inline] kauditd_hold_skb+0x1b1/0x1c0 kernel/audit.c:622 kauditd_send_queue+0x273/0x2c0 kernel/audit.c:807 kauditd_thread+0x444/0x670 kernel/audit.c:931 kthread+0x22a/0x280 kernel/kthread.c:467 ret_from_fork+0x150/0x360 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffffffff86c8c300 of 8 bytes by task 2640 on cpu 0: desc_read kernel/printk/printk_ringbuffer.c:496 [inline] desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline] desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline] prb_reserve+0x207/0xae0 kernel/printk/printk_ringbuffer.c:1674 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 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 dump_header+0x80/0x240 mm/oom_kill.c:467 oom_kill_process+0x295/0x350 mm/oom_kill.c:1047 out_of_memory+0x97d/0xb80 mm/oom_kill.c:1185 mem_cgroup_out_of_memory mm/memcontrol.c:1695 [inline] mem_cgroup_oom mm/memcontrol.c:1718 [inline] try_charge_memcg+0x62e/0xa10 mm/memcontrol.c:2456 try_charge mm/memcontrol.c:2556 [inline] charge_memcg mm/memcontrol.c:4744 [inline] mem_cgroup_swapin_charge_folio+0x103/0x1f0 mm/memcontrol.c:4830 __swap_cache_prepare_and_add+0x386/0x530 mm/swap_state.c:517 swap_cache_alloc_folio+0xa2/0x120 mm/swap_state.c:575 swap_cluster_readahead+0x26e/0x3d0 mm/swap_state.c:749 swapin_readahead+0xde/0x840 mm/swap_state.c:924 do_swap_page+0x309/0x2210 mm/memory.c:4801 handle_pte_fault mm/memory.c:6319 [inline] __handle_mm_fault mm/memory.c:6454 [inline] handle_mm_fault+0xb40/0x3020 mm/memory.c:6623 do_user_addr_fault+0x62f/0x1050 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x0000000000166120 -> 0x00000000001f7730 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 2640 Comm: syz.7.8608 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 ================================================================== do_swap_page+0x309/0x2210 mm/memory.c:4801 handle_pte_fault mm/memory.c:6319 [inline] __handle_mm_fault mm/memory.c:6454 [inline] handle_mm_fault+0xb40/0x3020 mm/memory.c:6623 do_user_addr_fault+0x62f/0x1050 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f0576c8d2b6 Code: 00 00 00 00 48 85 ff 74 0b e9 46 f6 ff ff 66 0f 1f 44 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 83 ec 28 31 f6 <64> 48 8b 04 25 28 00 00 00 48 89 44 24 18 8d 07 48 69 c0 83 de 1b RSP: 002b:00007fff8e079f80 EFLAGS: 00010246 RAX: 000000000013dc6b RBX: 00007f0576f05fa0 RCX: 000000000013da08 RDX: 0000000000000263 RSI: 0000000000000000 RDI: 00000000000003e8 RBP: 00007f0576f07da0 R08: 0000000024726a3b R09: 7fffffffffffffff R10: 3fffffffffffffff R11: 0000000000000246 R12: 000000000013de25 R13: 00007f0576f0609c R14: 000000000013dbb9 R15: 00007f0576f06090 memory: usage 307200kB, limit 307200kB, failcnt 23361 memory+swap: usage 1936kB, limit 9007199254740988kB, failcnt 0 kmem: usage 1212kB, limit 9007199254740988kB, failcnt 0 Memory cgroup stats for /syz7: cache 0 rss 24576 shmem 0 mapped_file 0 dirty 0 writeback 4096 workingset_refault_anon 905 workingset_refault_file 3904 swap 512000 swapcached 20865024 pgpgin 676990 pgpgout 676977 pgfault 670973 pgmajfault 373 inactive_anon 12288 active_anon 28672 inactive_file 12288 active_file 0 unevictable 0 hierarchical_memory_limit 314572800 hierarchical_memsw_limit 9223372036854771712 total_cache 0 total_rss 24576 total_shmem 0 total_mapped_file 0 total_dirty 0 total_writeback 4096 total_workingset_refault_anon 905 total_workingset_refault_file 3904 total_swap 512000 total_swapcached 20865024 total_pgpgin 676990 total_pgpgout 676977 total_pgfault 670973 total_pgmajfault 373 total_inactive_anon 12288 total_active_anon 28672 total_inactive_file 12288 total_active_file 0 total_unevictable 0 oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=/,mems_allowed=0,oom_memcg=/syz7,task_memcg=/syz7,task=syz.7.8608,pid=2640,uid=0 Memory cgroup out of memory: Killed process 2640 (syz.7.8608) total-vm:96208kB, anon-rss:1248kB, file-rss:22392kB, shmem-rss:0kB, UID:0 pgtables:128kB oom_score_adj:0