Messages in this thread | | | Date | Fri, 13 Dec 2019 14:04:07 -0800 | Subject | KCSAN: data-race in link_path_walk.part.0 / page_get_link | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 5863cc79 x86, kcsan: Enable KCSAN for x86 git tree: https://github.com/google/ktsan.git kcsan console output: https://syzkaller.appspot.com/x/log.txt?x=143b67cee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=186a3142a4cdd1db dashboard link: https://syzkaller.appspot.com/bug?extid=57b6149668c34058041c compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+57b6149668c34058041c@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in link_path_walk.part.0 / page_get_link
read to 0xffff88809b36e056 of 1 bytes by task 8667 on cpu 0: link_path_walk.part.0+0x2d7/0xa90 fs/namei.c:2109 link_path_walk fs/namei.c:2259 [inline] path_lookupat.isra.0+0x77/0x5a0 fs/namei.c:2307 filename_lookup+0x145/0x2b0 fs/namei.c:2338 user_path_at_empty+0x4c/0x70 fs/namei.c:2598 user_path_at include/linux/namei.h:49 [inline] do_mount+0xc8/0x1560 fs/namespace.c:3081 ksys_mount+0xe8/0x160 fs/namespace.c:3352 __do_sys_mount fs/namespace.c:3366 [inline] __se_sys_mount fs/namespace.c:3363 [inline] __x64_sys_mount+0x70/0x90 fs/namespace.c:3363 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
write to 0xffff88809b36e056 of 1 bytes by task 8674 on cpu 1: nd_terminate_link include/linux/namei.h:75 [inline] page_get_link+0x115/0x280 fs/namei.c:4787 get_link fs/namei.c:1069 [inline] trailing_symlink+0x505/0x5a0 fs/namei.c:2253 path_openat+0x6cc/0x36e0 fs/namei.c:3527 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x55/0x70 fs/open.c:1110 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8674 Comm: syz-executor.5 Not tainted 5.4.0-rc7+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================
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