tty: memory leak in tty_register_driver

From: Dmitry Vyukov
Date: Mon Feb 15 2016 - 05:43:05 EST

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Hello,

When I am running the following program in a parallel loop, kmemleak
starts reporting memory leaks of objects allocated in
tty_register_driver during boot. These leaks start popping up
chaotically and as you can see they originate in different drivers
(synclinkmp_init, isdn_init, chr_dev_init, sysfs_init).

On commit 388f7b1d6e8ca06762e2454d28d6c3c55ad0fe95 (4.5-rc3).

// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>

int main()
{
int fd, val;

fd = open("/dev/ptmx", O_RDWR);
val = 21;
ioctl(fd, TIOCSETD, &val);
return 0;
}

unreferenced object 0xffff88006708dc20 (size 8):
comm "swapper/0", pid 1, jiffies 4294672590 (age 930.839s)
hex dump (first 8 bytes):
74 74 79 53 4c 4d 38 00 ttySLM8.
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff88006709b330 (size 152):
comm "swapper/0", pid 1, jiffies 4294672590 (age 930.839s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
[<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
unreferenced object 0xffff88006708d860 (size 8):
comm "swapper/0", pid 1, jiffies 4294672591 (age 930.838s)
hex dump (first 8 bytes):
74 74 79 53 4c 4d 39 00 ttySLM9.
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff88006709a490 (size 152):
comm "swapper/0", pid 1, jiffies 4294672591 (age 930.853s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
[<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
unreferenced object 0xffff880064f3c960 (size 8):
comm "swapper/0", pid 1, jiffies 4294674404 (age 929.065s)
hex dump (first 8 bytes):
74 74 79 49 31 30 00 ff ttyI10..
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff848b4ef8>] isdn_tty_modem_init+0x3a8/0x1220
drivers/isdn/i4l/isdn_tty.c:1785
[<ffffffff889ed622>] isdn_init+0x2c3/0x505
drivers/isdn/i4l/isdn_common.c:2334
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
unreferenced object 0xffff880064f41380 (size 152):
comm "swapper/0", pid 1, jiffies 4294674404 (age 929.066s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff848b4ef8>] isdn_tty_modem_init+0x3a8/0x1220
drivers/isdn/i4l/isdn_tty.c:1785
[<ffffffff889ed622>] isdn_init+0x2c3/0x505
drivers/isdn/i4l/isdn_common.c:2334
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
unreferenced object 0xffff88006717e960 (size 8):
comm "swapper/0", pid 1, jiffies 4294672708 (age 973.931s)
hex dump (first 8 bytes):
32 33 37 3a 31 38 39 00 237:189.
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff880067169ad0 (size 152):
comm "swapper/0", pid 1, jiffies 4294672708 (age 973.931s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
[<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
unreferenced object 0xffff88006717eb40 (size 8):
comm "swapper/0", pid 1, jiffies 4294672709 (age 973.930s)
hex dump (first 8 bytes):
32 33 37 3a 31 39 30 00 237:190.
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff8800363ffa80 (size 152):
comm "swapper/0", pid 1, jiffies 4294672709 (age 973.962s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
[<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
unreferenced object 0xffff88006717ed20 (size 8):
comm "swapper/0", pid 1, jiffies 4294672711 (age 973.960s)
hex dump (first 8 bytes):
32 33 37 3a 31 39 31 00 237:191.
backtrace:
[<ffffffff81765d10>] __kmalloc_track_caller+0x1b0/0x320 mm/slub.c:4068
[<ffffffff816b37a9>] kstrdup+0x39/0x70 mm/util.c:53
[<ffffffff816b3826>] kstrdup_const+0x46/0x60 mm/util.c:74
[<ffffffff8194e5bb>] __kernfs_new_node+0x2b/0x2b0 fs/kernfs/dir.c:536
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff8800671c3cf0 (size 152):
comm "swapper/0", pid 1, jiffies 4294672711 (age 973.960s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_create_sys_dev_entry drivers/base/core.c:974
[<ffffffff8358a05c>] device_add+0xf9c/0x1480 drivers/base/core.c:1105
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889babcb>] synclinkmp_init+0x35a/0x40e
drivers/tty/synclinkmp.c:3992
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
[<ffffffff8663ca33>] kernel_init+0x13/0x150 init/main.c:936
[<ffffffff866617af>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468
unreferenced object 0xffff88006ca7f5a0 (size 152):
comm "swapper/0", pid 1, jiffies 4294670068 (age 267.578s)
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[<ffffffff8194e5fc>] __kernfs_new_node+0x6c/0x2b0 fs/kernfs/dir.c:540
[<ffffffff81951c70>] kernfs_new_node+0x80/0xe0 fs/kernfs/dir.c:572
[<ffffffff81957223>] kernfs_create_link+0x33/0x150 fs/kernfs/symlink.c:32
[<ffffffff81959c4b>] sysfs_do_create_link_sd.isra.2+0x8b/0x120
fs/sysfs/symlink.c:44
[< inline >] sysfs_do_create_link fs/sysfs/symlink.c:80
[<ffffffff81959d45>] sysfs_create_link+0x65/0xc0 fs/sysfs/symlink.c:92
[< inline >] device_add_class_symlinks drivers/base/core.c:891
[<ffffffff835897fc>] device_add+0x73c/0x1480 drivers/base/core.c:1086
[<ffffffff8358a55d>] device_register+0x1d/0x20 drivers/base/core.c:1189
[<ffffffff82f80b50>] tty_register_device_attr+0x320/0x760
drivers/tty/tty_io.c:3312
[< inline >] tty_register_device drivers/tty/tty_io.c:3239
[<ffffffff82f8133b>] tty_register_driver+0x36b/0x670
drivers/tty/tty_io.c:3504
[<ffffffff889b171c>] vty_init+0x366/0x398 drivers/tty/vt/vt.c:3093
[<ffffffff889af3f6>] tty_init+0x146/0x14a drivers/tty/tty_io.c:3686
[<ffffffff889bb4e8>] chr_dev_init+0x12a/0x13c drivers/char/mem.c:869
[<ffffffff81002259>] do_one_initcall+0x159/0x380 init/main.c:794
[< inline >] do_initcall_level init/main.c:859
[< inline >] do_initcalls init/main.c:867
[< inline >] do_basic_setup init/main.c:885
[<ffffffff888fcc29>] kernel_init_freeable+0x474/0x52d init/main.c:1010
unreferenced object 0xffff88003de48000 (size 2096):
comm "swapper/0", pid 0, jiffies 4294667421 (age 186.244s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[< inline >] __idr_pre_get lib/idr.c:196
[<ffffffff82be9253>] ida_pre_get+0x123/0x270 lib/idr.c:899
[<ffffffff82be9471>] ida_simple_get+0xd1/0x1d0 lib/idr.c:1096
[<ffffffff8194e622>] __kernfs_new_node+0x92/0x2b0 fs/kernfs/dir.c:544
[<ffffffff81952906>] kernfs_create_root+0xe6/0x2a0 fs/kernfs/dir.c:782
[<ffffffff88972422>] sysfs_init+0x18/0x8c fs/sysfs/mount.c:69
[<ffffffff8896d670>] mnt_init+0x1e0/0x42e fs/namespace.c:3143
[<ffffffff8896cfdc>] vfs_caches_init+0xaa/0x156 fs/dcache.c:3461
[<ffffffff888fc718>] start_kernel+0x60c/0x6a9 init/main.c:659
[<ffffffff888fb350>] x86_64_start_reservations+0x38/0x3a
arch/x86/kernel/head64.c:203
[<ffffffff888fb4aa>] x86_64_start_kernel+0x158/0x167
arch/x86/kernel/head64.c:184
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff88003de4ee58 (size 2096):
comm "swapper/0", pid 0, jiffies 4294667421 (age 186.244s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 80 e4 3d 00 88 ff ff ...........=....
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff81761ba3>] kmem_cache_alloc+0x153/0x2e0 mm/slub.c:2609
[< inline >] kmem_cache_zalloc include/linux/slab.h:597
[< inline >] __idr_pre_get lib/idr.c:196
[<ffffffff82be9253>] ida_pre_get+0x123/0x270 lib/idr.c:899
[<ffffffff82be9471>] ida_simple_get+0xd1/0x1d0 lib/idr.c:1096
[<ffffffff8194e622>] __kernfs_new_node+0x92/0x2b0 fs/kernfs/dir.c:544
[<ffffffff81952906>] kernfs_create_root+0xe6/0x2a0 fs/kernfs/dir.c:782
[<ffffffff88972422>] sysfs_init+0x18/0x8c fs/sysfs/mount.c:69
[<ffffffff8896d670>] mnt_init+0x1e0/0x42e fs/namespace.c:3143
[<ffffffff8896cfdc>] vfs_caches_init+0xaa/0x156 fs/dcache.c:3461
[<ffffffff888fc718>] start_kernel+0x60c/0x6a9 init/main.c:659
[<ffffffff888fb350>] x86_64_start_reservations+0x38/0x3a
arch/x86/kernel/head64.c:203
[<ffffffff888fb4aa>] x86_64_start_kernel+0x158/0x167
arch/x86/kernel/head64.c:184
[<ffffffffffffffff>] 0xffffffffffffffff

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