syzbot


memory leak in __register_sysctl_table

Status: upstream: reported C repro on 2022/06/16 13:57
Reported-by: syzbot+9f160a43b2cf201cbe65@syzkaller.appspotmail.com
First crash: 12d, last: 12d
Patch testing requests:
Created Duration User Patch Repo Result
2022/06/18 15:14 16m phind.uet@gmail.com linux-next OK log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff8881016dfa00 (size 256):
  comm "syz-executor201", pid 3662, jiffies 4294969093 (age 12.970s)
  hex dump (first 32 bytes):
    00 90 da 0d 81 88 ff ff 00 00 00 00 01 00 00 00  ................
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff816fe96b>] kmalloc include/linux/slab.h:605 [inline]
    [<ffffffff816fe96b>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff816fe96b>] __register_sysctl_table+0x7b/0x7f0 fs/proc/proc_sysctl.c:1344
    [<ffffffff82219a5a>] setup_mq_sysctls+0x12a/0x1c0 ipc/mq_sysctl.c:112
    [<ffffffff822196d2>] create_ipc_ns ipc/namespace.c:63 [inline]
    [<ffffffff822196d2>] copy_ipcs+0x292/0x390 ipc/namespace.c:91
    [<ffffffff8127de6c>] create_new_namespaces+0xdc/0x4f0 kernel/nsproxy.c:90
    [<ffffffff8127e88b>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
    [<ffffffff8123f92e>] ksys_unshare+0x2fe/0x600 kernel/fork.c:3165
    [<ffffffff8123fc42>] __do_sys_unshare kernel/fork.c:3236 [inline]
    [<ffffffff8123fc42>] __se_sys_unshare kernel/fork.c:3234 [inline]
    [<ffffffff8123fc42>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3234
    [<ffffffff845abc55>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845abc55>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

BUG: memory leak
unreferenced object 0xffff88810edf7b00 (size 256):
  comm "syz-executor201", pid 3662, jiffies 4294969093 (age 12.970s)
  hex dump (first 32 bytes):
    78 7b df 0e 81 88 ff ff 00 00 00 00 01 00 00 00  x{..............
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff816fee99>] kmalloc include/linux/slab.h:605 [inline]
    [<ffffffff816fee99>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff816fee99>] new_dir fs/proc/proc_sysctl.c:978 [inline]
    [<ffffffff816fee99>] get_subdir fs/proc/proc_sysctl.c:1022 [inline]
    [<ffffffff816fee99>] __register_sysctl_table+0x5a9/0x7f0 fs/proc/proc_sysctl.c:1373
    [<ffffffff82219a5a>] setup_mq_sysctls+0x12a/0x1c0 ipc/mq_sysctl.c:112
    [<ffffffff822196d2>] create_ipc_ns ipc/namespace.c:63 [inline]
    [<ffffffff822196d2>] copy_ipcs+0x292/0x390 ipc/namespace.c:91
    [<ffffffff8127de6c>] create_new_namespaces+0xdc/0x4f0 kernel/nsproxy.c:90
    [<ffffffff8127e88b>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
    [<ffffffff8123f92e>] ksys_unshare+0x2fe/0x600 kernel/fork.c:3165
    [<ffffffff8123fc42>] __do_sys_unshare kernel/fork.c:3236 [inline]
    [<ffffffff8123fc42>] __se_sys_unshare kernel/fork.c:3234 [inline]
    [<ffffffff8123fc42>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3234
    [<ffffffff845abc55>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845abc55>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

BUG: memory leak
unreferenced object 0xffff888101926f00 (size 256):
  comm "syz-executor201", pid 3662, jiffies 4294969093 (age 12.970s)
  hex dump (first 32 bytes):
    78 6f 92 01 81 88 ff ff 00 00 00 00 01 00 00 00  xo..............
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff816fee99>] kmalloc include/linux/slab.h:605 [inline]
    [<ffffffff816fee99>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff816fee99>] new_dir fs/proc/proc_sysctl.c:978 [inline]
    [<ffffffff816fee99>] get_subdir fs/proc/proc_sysctl.c:1022 [inline]
    [<ffffffff816fee99>] __register_sysctl_table+0x5a9/0x7f0 fs/proc/proc_sysctl.c:1373
    [<ffffffff82219a5a>] setup_mq_sysctls+0x12a/0x1c0 ipc/mq_sysctl.c:112
    [<ffffffff822196d2>] create_ipc_ns ipc/namespace.c:63 [inline]
    [<ffffffff822196d2>] copy_ipcs+0x292/0x390 ipc/namespace.c:91
    [<ffffffff8127de6c>] create_new_namespaces+0xdc/0x4f0 kernel/nsproxy.c:90
    [<ffffffff8127e88b>] unshare_nsproxy_namespaces+0x9b/0x120 kernel/nsproxy.c:226
    [<ffffffff8123f92e>] ksys_unshare+0x2fe/0x600 kernel/fork.c:3165
    [<ffffffff8123fc42>] __do_sys_unshare kernel/fork.c:3236 [inline]
    [<ffffffff8123fc42>] __se_sys_unshare kernel/fork.c:3234 [inline]
    [<ffffffff8123fc42>] __x64_sys_unshare+0x12/0x20 kernel/fork.c:3234
    [<ffffffff845abc55>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845abc55>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff8460006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-gce-leak 2022/06/12 13:46 upstream 7a68065eb9cd 0d5abf15 .config log report syz C memory leak in __register_sysctl_table