Messages in this thread | | | Date | Wed, 10 Apr 2024 01:30:26 -0700 | Subject | [syzbot] [kernel?] KCSAN: data-race in free_pid / zap_pid_ns_processes (5) | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: 20cb38a7af88 Merge tag 'for-6.9-rc2-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10b8252d180000 kernel config: https://syzkaller.appspot.com/x/.config?x=624180927e9036c3 dashboard link: https://syzkaller.appspot.com/bug?extid=335b9cda8abe9f28e1a4 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f043ce1e5189/disk-20cb38a7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3313ef4e0ece/vmlinux-20cb38a7.xz kernel image: https://storage.googleapis.com/syzbot-assets/3e166298ab90/bzImage-20cb38a7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+335b9cda8abe9f28e1a4@syzkaller.appspotmail.com
================================================================== BUG: KCSAN: data-race in free_pid / zap_pid_ns_processes
read-write to 0xffff88811257b5c8 of 4 bytes by task 10493 on cpu 1: free_pid+0x80/0x170 kernel/pid.c:143 __change_pid+0x19a/0x1c0 kernel/pid.c:367 detach_pid+0x1c/0x30 kernel/pid.c:372 __unhash_process kernel/exit.c:133 [inline] __exit_signal kernel/exit.c:202 [inline] release_task+0x6e7/0xc30 kernel/exit.c:259 exit_notify kernel/exit.c:774 [inline] do_exit+0xf7d/0x1740 kernel/exit.c:898 do_group_exit+0x102/0x150 kernel/exit.c:1027 get_signal+0xf2f/0x1080 kernel/signal.c:2911 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218 do_syscall_64+0xe2/0x1d0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a
read to 0xffff88811257b5c8 of 4 bytes by task 10223 on cpu 0: zap_pid_ns_processes+0x1ec/0x2c0 kernel/pid_namespace.c:249 find_child_reaper kernel/exit.c:610 [inline] forget_original_parent kernel/exit.c:699 [inline] exit_notify kernel/exit.c:736 [inline] do_exit+0x14b4/0x1740 kernel/exit.c:898 do_group_exit+0x102/0x150 kernel/exit.c:1027 get_signal+0xf2f/0x1080 kernel/signal.c:2911 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218 do_syscall_64+0xe2/0x1d0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a
value changed: 0x00000002 -> 0x00000001
Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10223 Comm: syz-executor.4 Tainted: G W 6.9.0-rc3-syzkaller-00011-g20cb38a7af88 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ==================================================================
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