entry_SYSCALL_64_after_hwframe+0x77/0x7f ================================================================== BUG: KCSAN: data-race in _prb_read_valid / data_alloc write to 0xffffffff86878b60 of 8 bytes by task 28037 on cpu 0: data_alloc+0x271/0x2b0 kernel/printk/printk_ringbuffer.c:1095 prb_reserve+0x808/0xaf0 kernel/printk/printk_ringbuffer.c:1669 vprintk_store+0x56d/0x860 kernel/printk/printk.c:2326 vprintk_emit+0x178/0x650 kernel/printk/printk.c:2426 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 random_pm_notification+0x153/0x1a0 drivers/char/random.c:856 notifier_call_chain kernel/notifier.c:85 [inline] notifier_call_chain_robust+0x74/0x350 kernel/notifier.c:120 blocking_notifier_call_chain_robust+0x50/0x80 kernel/notifier.c:345 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:103 snapshot_open+0x120/0x270 kernel/power/user.c:87 misc_open+0x1d3/0x200 drivers/char/misc.c:161 chrdev_open+0x2e8/0x3a0 fs/char_dev.c:414 do_dentry_open+0x649/0xa20 fs/open.c:965 vfs_open+0x37/0x1e0 fs/open.c:1095 do_open fs/namei.c:3887 [inline] path_openat+0x1c5e/0x2170 fs/namei.c:4046 do_filp_open+0x109/0x230 fs/namei.c:4073 do_sys_openat2+0xa6/0x110 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0xf2/0x120 fs/open.c:1461 x64_sys_call+0x2e9c/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffffffff86878b60 of 16 bytes by task 28032 on cpu 1: desc_read kernel/printk/printk_ringbuffer.c:482 [inline] desc_read_finalized_seq kernel/printk/printk_ringbuffer.c:1874 [inline] prb_read kernel/printk/printk_ringbuffer.c:1922 [inline] _prb_read_valid+0x1bc/0x920 kernel/printk/printk_ringbuffer.c:2113 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2185 printk_get_next_message+0xc8/0x510 kernel/printk/printk.c:3005 console_emit_next_record kernel/printk/printk.c:3092 [inline] console_flush_all+0x290/0x730 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xa1/0x330 kernel/printk/printk.c:3325 vprintk_emit+0x388/0x650 kernel/printk/printk.c:2450 vprintk_default+0x26/0x30 kernel/printk/printk.c:2465 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82 _printk+0x79/0xa0 kernel/printk/printk.c:2475 printk_stack_address arch/x86/kernel/dumpstack.c:70 [inline] show_trace_log_lvl+0x4e3/0x560 arch/x86/kernel/dumpstack.c:282 __warn+0x13e/0x340 kernel/panic.c:835 __report_bug lib/bug.c:195 [inline] report_bug+0x309/0x400 lib/bug.c:215 handle_bug+0x84/0x160 arch/x86/kernel/traps.c:338 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:392 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 reg_bounds_sanity_check+0x673/0x680 kernel/bpf/verifier.c:2722 reg_set_min_max+0x1c1/0x260 kernel/bpf/verifier.c:16334 check_cond_jmp_op+0x1080/0x16e0 kernel/bpf/verifier.c:16768 do_check_insn kernel/bpf/verifier.c:19956 [inline] do_check+0x332a/0x7a10 kernel/bpf/verifier.c:20093 do_check_common+0xc3a/0x12a0 kernel/bpf/verifier.c:23260 do_check_main kernel/bpf/verifier.c:23343 [inline] bpf_check+0x942b/0xd9e0 kernel/bpf/verifier.c:24703 bpf_prog_load+0xedd/0x1070 kernel/bpf/syscall.c:2979 __sys_bpf+0x462/0x7b0 kernel/bpf/syscall.c:6029 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x41/0x50 kernel/bpf/syscall.c:6137 x64_sys_call+0x2aea/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:322 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 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: 28032 Comm: syz.0.8708 Not tainted 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 ================================================================== RIP: 0033:0x7f710586ebe9 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:00007f71042d7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f7105a95fa0 RCX: 00007f710586ebe9 RDX: 0000000000000048 RSI: 00002000000017c0 RDI: 0000000000000005 RBP: 00007f71058f1e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7105a96038 R14: 00007f7105a95fa0 R15: 00007ffcd1ddaa48 ---[ end trace 0000000000000000 ]---