syzbot


KCSAN: data-race in dont_mount / step_into

Status: moderation: reported syz repro on 2022/05/07 00:44
Subsystems: isofs
[Documentation on labels]
Reported-by: syzbot+7ab22e852c066cf2af27@syzkaller.appspotmail.com
First crash: 1049d, last: 9h53m

Sample crash report:
==================================================================
BUG: KCSAN: data-race in dont_mount / step_into

read-write to 0xffff888109362c00 of 4 bytes by task 3337 on cpu 0:
 dont_mount+0x27/0x40 include/linux/dcache.h:363
 vfs_unlink+0x298/0x430 fs/namei.c:4345
 do_unlinkat+0x236/0x4c0 fs/namei.c:4407
 __do_sys_unlink fs/namei.c:4455 [inline]
 __se_sys_unlink fs/namei.c:4453 [inline]
 __x64_sys_unlink+0x30/0x40 fs/namei.c:4453
 x64_sys_call+0x28a3/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888109362c00 of 4 bytes by task 2786 on cpu 1:
 __follow_mount_rcu fs/namei.c:1485 [inline]
 handle_mounts fs/namei.c:1536 [inline]
 step_into+0xe7/0x810 fs/namei.c:1842
 walk_component+0x169/0x230 fs/namei.c:2010
 lookup_last fs/namei.c:2469 [inline]
 path_lookupat+0x10a/0x2b0 fs/namei.c:2493
 filename_lookup+0x127/0x300 fs/namei.c:2522
 user_path_at_empty+0x42/0x120 fs/namei.c:2929
 do_readlinkat+0x92/0x210 fs/stat.c:499
 __do_sys_readlink fs/stat.c:532 [inline]
 __se_sys_readlink fs/stat.c:529 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:529
 x64_sys_call+0x264b/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00600008 -> 0x00008008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2786 Comm: udevd Not tainted 6.10.0-rc4-syzkaller-00045-g92e5605a199e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================

Crashes (1573):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/19 16:38 upstream 92e5605a199e 41b7e219 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/18 23:07 upstream 6537cfb395f3 9a14138f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/18 09:26 upstream 2408a807bfc3 c37c7249 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/17 21:21 upstream 2408a807bfc3 429ea007 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/17 09:14 upstream 0ad2507d5d93 4121cf9d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/17 01:00 upstream 224e74511041 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/15 09:19 upstream 78a632a2086c 40a34ec9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/15 04:13 upstream 78a632a2086c 1022af74 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/14 06:18 upstream 68763b29e0a6 d9a046cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/12 23:25 upstream 4dc1d1bec898 b27c2402 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/11 20:25 upstream 09fbf3d50205 f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/11 17:00 upstream febbc555cf0f f2baddf5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/11 03:21 upstream febbc555cf0f 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/10 17:12 upstream a64dcfb451e2 43f51a00 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/10 08:50 upstream a64dcfb451e2 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/09 19:24 upstream 69b54314c975 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/09 01:43 upstream 9946eaf552b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/08 12:54 upstream 8f6629c004b1 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/07 23:10 upstream 7ee983c850b4 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/07 19:33 upstream bb066fe812d6 ef44b750 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/07 07:01 upstream bb066fe812d6 53657d1b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/07 02:48 upstream bb066fe812d6 8002dd28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/06 19:28 upstream 92514ef226f5 8002dd28 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/06 05:26 upstream 92514ef226f5 577d049b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/05 14:17 upstream 5c8c229261f1 4dc70884 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/05 10:30 upstream 5c8c229261f1 5896748e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/04 19:22 upstream d009de7d5428 8f267cef .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/04 01:23 upstream 0de63bb7d919 8f267cef .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/03 16:05 upstream 2014c95afece a21a8419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/02/01 20:42 upstream cabb4685d57e 568559e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/31 18:26 upstream 69b8923f5003 aa47157c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/31 05:16 upstream 69e858e0b8b2 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/30 18:10 upstream 72deda0abee6 4c6ac32f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/30 06:00 upstream ebbb8be421ee afe4eff5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/29 20:50 upstream ebbb8be421ee 136953f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/29 12:53 upstream 05dbaf8dd8bf 136953f1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/29 03:16 upstream 05dbaf8dd8bf 865ef71e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/28 17:01 upstream 6d61a53dd6f5 f5427d7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/28 11:46 upstream 6d61a53dd6f5 18070896 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/27 11:08 upstream 9c5968db9e62 d99a33ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/26 23:20 upstream c2da8b3f914f 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/26 08:30 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/25 18:57 upstream 0f8e26b38d7a 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/25 03:59 upstream b46c89c08f41 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2025/01/24 14:33 upstream 113691ce9f32 1293872d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2022/05/06 23:52 upstream 64267926e01b e60b1103 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2022/05/06 21:37 upstream 64267926e01b e60b1103 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
2022/04/07 05:11 upstream 3e732ebf7316 53c67432 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dont_mount / step_into
* Struck through repros no longer work on HEAD.