FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 ================================================================== BUG: KCSAN: data-race in data_push_tail / symbol_string write to 0xffffffff86f4fcc8 of 1 bytes by task 24930 on cpu 1: string_nocheck lib/vsprintf.c:648 [inline] symbol_string+0x1b6/0x240 lib/vsprintf.c:1004 pointer+0x77a/0xd10 lib/vsprintf.c:2415 vsnprintf+0x861/0xe20 lib/vsprintf.c:2821 vscnprintf+0x42/0x80 lib/vsprintf.c:2923 printk_sprint+0x30/0x2d0 kernel/printk/printk.c:2128 vprintk_store+0x56f/0x800 kernel/printk/printk.c:2242 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50 _printk+0x7a/0xa0 kernel/printk/printk.c:2328 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline] show_trace_log_lvl+0x37e/0x400 arch/x86/kernel/dumpstack.c:285 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xda/0x130 lib/dump_stack.c:106 dump_stack+0x15/0x20 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x21f/0x230 lib/fault-inject.c:153 should_fail+0xb/0x10 lib/fault-inject.c:163 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37 copyin lib/iov_iter.c:189 [inline] copy_page_from_iter_atomic+0x22d/0xcf0 lib/iov_iter.c:581 generic_perform_write+0x212/0x410 mm/filemap.c:3931 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4044 call_write_iter include/linux/fs.h:1877 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4ab/0x7d0 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffffffff86f4fcc8 of 8 bytes by task 24936 on cpu 0: data_make_reusable kernel/printk/printk_ringbuffer.c:590 [inline] data_push_tail+0x102/0x430 kernel/printk/printk_ringbuffer.c:675 data_alloc+0xbe/0x2c0 kernel/printk/printk_ringbuffer.c:1046 prb_reserve+0x893/0xbc0 kernel/printk/printk_ringbuffer.c:1555 vprintk_store+0x53e/0x800 kernel/printk/printk.c:2232 vprintk_emit+0xd0/0x430 kernel/printk/printk.c:2288 vprintk_default+0x26/0x30 kernel/printk/printk.c:2318 vprintk+0x83/0x90 kernel/printk/printk_safe.c:50 _printk+0x7a/0xa0 kernel/printk/printk.c:2328 fail_dump lib/fault-inject.c:45 [inline] should_fail_ex+0x207/0x230 lib/fault-inject.c:153 should_fail+0xb/0x10 lib/fault-inject.c:163 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37 copyin lib/iov_iter.c:189 [inline] copy_page_from_iter_atomic+0x22d/0xcf0 lib/iov_iter.c:581 generic_perform_write+0x212/0x410 mm/filemap.c:3931 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4044 call_write_iter include/linux/fs.h:1877 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4ab/0x7d0 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x00000000fffffb33 -> 0x000000000a303332 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 24936 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00038-g16931859a650 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 ================================================================== CPU: 0 PID: 24936 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00038-g16931859a650 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xda/0x130 lib/dump_stack.c:106 dump_stack+0x15/0x20 lib/dump_stack.c:113 fail_dump lib/fault-inject.c:52 [inline] should_fail_ex+0x21f/0x230 lib/fault-inject.c:153 should_fail+0xb/0x10 lib/fault-inject.c:163 should_fail_usercopy+0x1a/0x20 lib/fault-inject-usercopy.c:37 copyin lib/iov_iter.c:189 [inline] copy_page_from_iter_atomic+0x22d/0xcf0 lib/iov_iter.c:581 generic_perform_write+0x212/0x410 mm/filemap.c:3931 __generic_file_write_iter+0xa1/0x120 mm/filemap.c:4018 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4044 call_write_iter include/linux/fs.h:1877 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4ab/0x7d0 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4df232282f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48 RSP: 002b:00007f4df16a5e70 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000200000 RCX: 00007f4df232282f RDX: 0000000000200000 RSI: 00007f4de9286000 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000b6a R10: 00000000000003cc R11: 0000000000000293 R12: 0000000000000004 R13: 00007f4df16a5f3c R14: 00007f4df16a5f40 R15: 00007f4de9286000 loop2: detected capacity change from 0 to 4096 EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.