===================================== WARNING: bad unlock balance detected! 4.19.0-rc1+ #211 Not tainted ------------------------------------- syz-executor5/6543 is trying to release lock (&file->mut) at: [] ucma_destroy_id+0x2cb/0x550 drivers/infiniband/core/ucma.c:624 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor5/6543: #0: 00000000ff2eeafd (&file->mut){+.+.}, at: ucma_destroy_id+0x26b/0x550 drivers/infiniband/core/ucma.c:622 stack backtrace: CPU: 1 PID: 6543 Comm: syz-executor5 Not tainted 4.19.0-rc1+ #211 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_unlock_imbalance_bug.cold.49+0xcc/0xd8 kernel/locking/lockdep.c:3465 __lock_release kernel/locking/lockdep.c:3672 [inline] lock_release+0x76e/0x9f0 kernel/locking/lockdep.c:3920 __mutex_unlock_slowpath+0x102/0x8c0 kernel/locking/mutex.c:1198 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_destroy_id+0x2cb/0x550 drivers/infiniband/core/ucma.c:624 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x117/0x9d0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1d61296c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1d612976d4 RCX: 0000000000457089 RDX: 0000000000000018 RSI: 0000000020000480 RDI: 0000000000000005 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d7470 R14: 00000000004c17a8 R15: 0000000000000001 ================================================================== BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline] BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:47 [inline] BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0x10f/0x8c0 kernel/locking/mutex.c:1207 Read of size 8 at addr ffff8801b1428c80 by task syz-executor5/6543 CPU: 1 PID: 6543 Comm: syz-executor5 Not tainted 4.19.0-rc1+ #211 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline] atomic_long_read include/asm-generic/atomic-long.h:47 [inline] __mutex_unlock_slowpath+0x10f/0x8c0 kernel/locking/mutex.c:1207 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_destroy_id+0x2cb/0x550 drivers/infiniband/core/ucma.c:624 ucma_write+0x336/0x420 drivers/infiniband/core/ucma.c:1680 __vfs_write+0x117/0x9d0 fs/read_write.c:485 vfs_write+0x1fc/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1d61296c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1d612976d4 RCX: 0000000000457089 RDX: 0000000000000018 RSI: 0000000020000480 RDI: 0000000000000005 RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d7470 R14: 00000000004c17a8 R15: 0000000000000001 Allocated by task 6543: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x730 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] ucma_open+0xb5/0x3f0 drivers/infiniband/core/ucma.c:1712 misc_open+0x3ca/0x560 drivers/char/misc.c:141 chrdev_open+0x25a/0x770 fs/char_dev.c:417 do_dentry_open+0x49c/0x1140 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12fb/0x5300 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6534: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x210 mm/slab.c:3813 ucma_close+0x26a/0x300 drivers/infiniband/core/ucma.c:1769 __fput+0x36e/0x8c0 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801b1428c80 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff8801b1428c80, ffff8801b1428d80) The buggy address belongs to the page: page:ffffea0006c50a00 count:1 mapcount:0 mapping:ffff8801dac007c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006b95408 ffffea00072901c8 ffff8801dac007c0 raw: 0000000000000000 ffff8801b1428000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b1428b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b1428c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801b1428c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801b1428d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801b1428d80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ==================================================================