Messages in this thread | | | Date | Sat, 23 Feb 2019 23:10:04 -0800 | Subject | WARNING: bad unlock balance detected! (3) | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: 40e196a906d9 Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12a49614c00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7132344728e7ec3f dashboard link: https://syzkaller.appspot.com/bug?extid=f3e3434787332dfc1c47 compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: i386 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a18ed4c00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f3e3434787332dfc1c47@syzkaller.appspotmail.com
Enabling of bearer <udp: yz1> rejected, already enabled ===================================== Enabling of bearer <udp: yz1> rejected, already enabled WARNING: bad unlock balance detected! 5.0.0-rc7+ #80 Not tainted ------------------------------------- kworker/1:1/22 is trying to release lock ( ================================================================== BUG: KASAN: slab-out-of-bounds in print_unlock_imbalance_bug kernel/locking/lockdep.c:3383 [inline] BUG: KASAN: slab-out-of-bounds in print_unlock_imbalance_bug.cold+0x97/0x123 kernel/locking/lockdep.c:3368 Read of size 8 at addr ffff888216be498c by task kworker/1:1/22 Enabling of bearer <udp: yz1> rejected, already enabled
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 5.0.0-rc7+ #80 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: addrconf_dad_work (ipv6_addrconf) Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 print_unlock_imbalance_bug kernel/locking/lockdep.c:3383 [inline] print_unlock_imbalance_bug.cold+0x97/0x123 kernel/locking/lockdep.c:3368 __lock_release kernel/locking/lockdep.c:3601 [inline] lock_release+0x67e/0xa00 kernel/locking/lockdep.c:3860 process_one_work+0xa47/0x1790 kernel/workqueue.c:2180 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Allocated by task 1: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] __alloc_workqueue_key+0x79c/0xe00 kernel/workqueue.c:4099 addrconf_init+0x9a/0x3b1 net/ipv6/addrconf.c:6906 inet6_init+0x36c/0x6e1 net/ipv6/af_inet6.c:1022 do_one_initcall+0x109/0x796 init/main.c:887 do_initcall_level init/main.c:955 [inline] do_initcalls init/main.c:963 [inline] do_basic_setup init/main.c:981 [inline] kernel_init_freeable+0x4da/0x5c9 init/main.c:1136 kernel_init+0x12/0x1c5 init/main.c:1054 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Freed by task 0: (stack is not available)
The buggy address belongs to the object at ffff888216be4780 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 12 bytes to the right of 512-byte region [ffff888216be4780, ffff888216be4980) The buggy address belongs to the page: page:ffffea00085af900 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0xffff888216be4280 flags: 0x6fffc0000000200(slab) raw: 06fffc0000000200 ffffea0008581008 ffffea0008597888 ffff88812c3f0940 raw: ffff888216be4280 ffff888216be4000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff888216be4880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888216be4900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc > ffff888216be4980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888216be4a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888216be4a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================
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