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memory leak in kobject_set_name_vargs (5)

Status: upstream: reported C repro on 2022/06/22 23:13
Reported-by: syzbot+7381dc4ad60658ca4c05@syzkaller.appspotmail.com
First crash: 97d, last: 50d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in kobject_set_name_vargs C 12 1180d 1214d 13/24 fixed on 2019/07/10 21:40
upstream memory leak in kobject_set_name_vargs (3) C 19 677d 733d 17/24 fixed on 2020/11/16 12:12
upstream memory leak in kobject_set_name_vargs (2) C done 47 974d 1158d 16/24 fixed on 2020/02/18 14:31
upstream memory leak in kobject_set_name_vargs (4) C 171 386d 673d 22/24 fixed on 2021/11/10 00:51

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 25.990s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 27.260s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 28.520s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 31.000s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 31.040s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810c35db80 (size 32):
  comm "syz-executor261", pid 3645, jiffies 4294950822 (age 31.080s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 37 00 00 00 00 00 00 00 00 00 00 00  loop7...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff814bf836>] kstrdup+0x36/0x70 mm/util.c:61
    [<ffffffff814bf8c3>] kstrdup_const+0x53/0x80 mm/util.c:84
    [<ffffffff8239c002>] kvasprintf_const+0xc2/0x110 lib/kasprintf.c:48
    [<ffffffff82492b6b>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:257
    [<ffffffff82492fed>] kobject_add_varg lib/kobject.c:352 [inline]
    [<ffffffff82492fed>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:441
    [<ffffffff81e10e8a>] nilfs_sysfs_create_device_group+0x9a/0x3d0 fs/nilfs2/sysfs.c:991
    [<ffffffff81df964c>] init_nilfs+0x51c/0x680 fs/nilfs2/the_nilfs.c:637
    [<ffffffff81de57ab>] nilfs_fill_super fs/nilfs2/super.c:1047 [inline]
    [<ffffffff81de57ab>] nilfs_mount+0x51b/0x890 fs/nilfs2/super.c:1317
    [<ffffffff8164981b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
    [<ffffffff815e2c68>] vfs_get_tree+0x28/0x100 fs/super.c:1497
    [<ffffffff81626e27>] do_new_mount fs/namespace.c:3040 [inline]
    [<ffffffff81626e27>] path_mount+0xc37/0x1120 fs/namespace.c:3370
    [<ffffffff81627a5e>] do_mount fs/namespace.c:3383 [inline]
    [<ffffffff81627a5e>] __do_sys_mount fs/namespace.c:3591 [inline]
    [<ffffffff81627a5e>] __se_sys_mount fs/namespace.c:3568 [inline]
    [<ffffffff81627a5e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
    [<ffffffff845cad15>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff845cad15>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84600087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

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
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
executing program
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
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
executing program
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 (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-gce-leak 2022/08/04 22:00 upstream b44f2fd87919 1c9013ac .config log report syz C memory leak in kobject_set_name_vargs
ci-upstream-gce-leak 2022/06/18 23:11 upstream 4b35035bcf80 8f633d84 .config log report syz memory leak in kobject_set_name_vargs
* Struck through repros no longer work on HEAD.