Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: __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+0x265/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 ================================================================== BUG: KCSAN: data-race in data_alloc / prb_reserve write to 0xffffffff86885d50 of 8 bytes by task 7889 on cpu 1: data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130 prb_reserve+0x8d7/0xad0 kernel/printk/printk_ringbuffer.c:1724 vprintk_store+0x53c/0x830 kernel/printk/printk.c:2302 vprintk_emit+0x15a/0x5c0 kernel/printk/printk.c:2402 dev_vprintk_emit+0x242/0x2a0 drivers/base/core.c:4914 dev_printk_emit+0x84/0xb0 drivers/base/core.c:4925 __dev_printk+0xf3/0x110 drivers/base/core.c:4937 _dev_info+0x9b/0xd0 drivers/base/core.c:4983 attach_store+0x495/0x680 drivers/usb/usbip/vhci_sysfs.c:416 dev_attr_store+0x4a/0x70 drivers/base/core.c:2437 sysfs_kf_write+0xfe/0x120 fs/sysfs/file.c:142 kernfs_fop_write_iter+0x1eb/0x300 fs/kernfs/file.c:352 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x52a/0x960 fs/read_write.c:686 ksys_write+0xda/0x1a0 fs/read_write.c:738 __do_sys_write fs/read_write.c:749 [inline] __se_sys_write fs/read_write.c:746 [inline] __x64_sys_write+0x40/0x50 fs/read_write.c:746 x64_sys_call+0x2847/0x3000 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86885d50 of 8 bytes by task 7887 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+0x207/0xad0 kernel/printk/printk_ringbuffer.c:1674 vprintk_store+0x53c/0x830 kernel/printk/printk.c:2302 vprintk_emit+0x15a/0x5c0 kernel/printk/printk.c:2402 vprintk_default+0x26/0x30 kernel/printk/printk.c:2441 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2451 printk_stack_address arch/x86/kernel/dumpstack.c:70 [inline] __show_trace_log_lvl+0x4e3/0x560 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+0x265/0x280 lib/fault-inject.c:174 should_failslab+0x8c/0xb0 mm/failslab.c:46 slab_pre_alloc_hook mm/slub.c:4906 [inline] slab_alloc_node mm/slub.c:5239 [inline] __kmalloc_cache_noprof+0x65/0x4c0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] alloc_pipe_info+0xae/0x340 fs/pipe.c:800 splice_direct_to_actor+0x592/0x680 fs/splice.c:1049 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1230 do_sendfile+0x380/0x650 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417 x64_sys_call+0x2db1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000238090 -> 0x00000000002cbb88 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 7887 Comm: syz.6.22317 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== slab_pre_alloc_hook mm/slub.c:4906 [inline] slab_alloc_node mm/slub.c:5239 [inline] __kmalloc_cache_noprof+0x65/0x4c0 mm/slub.c:5771 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] alloc_pipe_info+0xae/0x340 fs/pipe.c:800 splice_direct_to_actor+0x592/0x680 fs/splice.c:1049 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0xda/0x150 fs/splice.c:1230 do_sendfile+0x380/0x650 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417 x64_sys_call+0x2db1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff66c90f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff66b377038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ff66cb65fa0 RCX: 00007ff66c90f749 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007ff66b377090 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000003ffff R11: 0000000000000246 R12: 0000000000000001 R13: 00007ff66cb66038 R14: 00007ff66cb65fa0 R15: 00007fffbc941238