IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
=====================================
WARNING: bad unlock balance detected!
4.14.131 #25 Not tainted
-------------------------------------
syz-executor.0/7941 is trying to release lock (&file->mut) at:
[<ffffffff84789c6d>] ucma_destroy_id+0x20d/0x420 drivers/infiniband/core/ucma.c:606
but there are no more locks to release!
other info that might help us debug this:
1 lock held by syz-executor.0/7941:
#0: (&file->mut){+.+.}, at: [<ffffffff84789c0a>] ucma_destroy_id+0x1aa/0x420 drivers/infiniband/core/ucma.c:604
stack backtrace:
CPU: 1 PID: 7941 Comm: syz-executor.0 Not tainted 4.14.131 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_unlock_imbalance_bug kernel/locking/lockdep.c:3548 [inline]
print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3525
__lock_release kernel/locking/lockdep.c:3762 [inline]
lock_release+0x616/0x940 kernel/locking/lockdep.c:4010
__mutex_unlock_slowpath+0x71/0x800 kernel/locking/mutex.c:1018
mutex_unlock+0xd/0x10 kernel/locking/mutex.c:614
ucma_destroy_id+0x20d/0x420 drivers/infiniband/core/ucma.c:606
ucma_write+0x231/0x310 drivers/infiniband/core/ucma.c:1672
__vfs_write+0x105/0x6b0 fs/read_write.c:480
vfs_write+0x198/0x500 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xfd/0x230 fs/read_write.c:582
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459519
RSP: 002b:00007f5ffff83c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519
RDX: 0000000020000118 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5ffff846d4
R13: 00000000004d0138 R14: 00000000004e02c8 R15: 00000000ffffffff
==================================================================
BUG: KASAN: use-after-free in ucma_destroy_id+0x3e2/0x420 drivers/infiniband/core/ucma.c:608
Read of size 8 at addr ffff888089d48128 by task syz-executor.0/7941
CPU: 1 PID: 7941 Comm: syz-executor.0 Not tainted 4.14.131 #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x138/0x19c lib/dump_stack.c:53
print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report mm/kasan/report.c:409 [inline]
kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
ucma_destroy_id+0x3e2/0x420 drivers/infiniband/core/ucma.c:608
ucma_write+0x231/0x310 drivers/infiniband/core/ucma.c:1672
__vfs_write+0x105/0x6b0 fs/read_write.c:480
vfs_write+0x198/0x500 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xfd/0x230 fs/read_write.c:582
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459519
RSP: 002b:00007f5ffff83c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519
RDX: 0000000020000118 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5ffff846d4
R13: 00000000004d0138 R14: 00000000004e02c8 R15: 00000000ffffffff
Allocated by task 7937:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc mm/kasan/kasan.c:551 [inline]
kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529
kmem_cache_alloc_trace+0x152/0x790 mm/slab.c:3618
kmalloc include/linux/slab.h:488 [inline]
kzalloc include/linux/slab.h:661 [inline]
ucma_alloc_ctx+0x85/0x520 drivers/infiniband/core/ucma.c:192
ucma_create_id+0xed/0x5b0 drivers/infiniband/core/ucma.c:478
ucma_write+0x231/0x310 drivers/infiniband/core/ucma.c:1672
__vfs_write+0x105/0x6b0 fs/read_write.c:480
vfs_write+0x198/0x500 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xfd/0x230 fs/read_write.c:582
do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
Freed by task 7936:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x45/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xcc/0x270 mm/slab.c:3815
ucma_free_ctx+0x73c/0xa30 drivers/infiniband/core/ucma.c:577
ucma_close+0x11d/0x310 drivers/infiniband/core/ucma.c:1758
__fput+0x275/0x7a0 fs/file_table.c:210
____fput+0x16/0x20 fs/file_table.c:244
task_work_run+0x114/0x190 kernel/task_work.c:113
tracehook_notify_resume include/linux/tracehook.h:191 [inline]
exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
The buggy address belongs to the object at ffff888089d480c0
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 104 bytes inside of
256-byte region [ffff888089d480c0, ffff888089d481c0)
The buggy address belongs to the page:
page:ffffea0002275200 count:1 mapcount:0 mapping:ffff888089d480c0 index:0x0
flags: 0x1fffc0000000100(slab)
raw: 01fffc0000000100 ffff888089d480c0 0000000000000000 000000010000000c
raw: ffffea000228d2a0 ffffea0002a11820 ffff8880aa8007c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888089d48000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888089d48080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff888089d48100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888089d48180: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888089d48200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================