===================================== WARNING: bad unlock balance detected! 5.0.0-rc7+ #82 Not tainted ------------------------------------- kobject: 'loop2' (000000002a26fb3f): kobject_uevent_env syz-executor.1/21415 is trying to release lock (&file->mut) at: [] ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 kobject: 'loop2' (000000002a26fb3f): fill_kobj_path: path = '/devices/virtual/block/loop2' but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.1/21415: #0: 00000000bd48d0d9 (&file->mut){+.+.}, at: ucma_destroy_id+0x1e9/0x4a0 drivers/infiniband/core/ucma.c:626 stack backtrace: kobject: 'loop3' (00000000205d86eb): kobject_uevent_env CPU: 0 PID: 21415 Comm: syz-executor.1 Not tainted 5.0.0-rc7+ #82 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'loop3' (00000000205d86eb): fill_kobj_path: path = '/devices/virtual/block/loop3' __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_unlock_imbalance_bug kernel/locking/lockdep.c:3391 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3368 kobject: 'loop0' (00000000bcc4e94f): kobject_uevent_env __lock_release kernel/locking/lockdep.c:3601 [inline] lock_release+0x67e/0xa00 kernel/locking/lockdep.c:3860 kobject: 'loop0' (00000000bcc4e94f): fill_kobj_path: path = '/devices/virtual/block/loop0' __mutex_unlock_slowpath+0x8e/0x6b0 kernel/locking/mutex.c:1197 mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 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+0x103/0x610 arch/x86/entry/common.c:290 kobject: 'loop2' (000000002a26fb3f): kobject_uevent_env entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop2' (000000002a26fb3f): fill_kobj_path: path = '/devices/virtual/block/loop2' RSP: 002b:00007f716275bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000018 RSI: 0000000020000040 RDI: 0000000000000007 kobject: 'loop0' (00000000bcc4e94f): kobject_uevent_env RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f716275c6d4 R13: 00000000004cd828 R14: 00000000004dcae8 R15: 00000000ffffffff kobject: 'loop0' (00000000bcc4e94f): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (000000001612aef8): kobject_uevent_env kobject: 'loop5' (000000001612aef8): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (000000002a26fb3f): kobject_uevent_env kobject: 'loop2' (000000002a26fb3f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (000000001612aef8): kobject_uevent_env kobject: 'loop5' (000000001612aef8): fill_kobj_path: path = '/devices/virtual/block/loop5' ================================================================== kobject: 'loop3' (00000000205d86eb): kobject_uevent_env 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+0x9b/0x6b0 kernel/locking/mutex.c:1206 Read of size 8 at addr ffff8880a0722ac0 by task syz-executor.1/21415 CPU: 1 PID: 21415 Comm: syz-executor.1 Not tainted 5.0.0-rc7+ #82 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+0x172/0x1f0 lib/dump_stack.c:113 kobject: 'loop3' (00000000205d86eb): fill_kobj_path: path = '/devices/virtual/block/loop3' print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kobject: 'loop2' (000000002a26fb3f): kobject_uevent_env kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:100 kobject: 'loop2' (000000002a26fb3f): fill_kobj_path: path = '/devices/virtual/block/loop2' atomic64_read include/asm-generic/atomic-instrumented.h:27 [inline] atomic_long_read include/asm-generic/atomic-long.h:47 [inline] __mutex_unlock_slowpath+0x9b/0x6b0 kernel/locking/mutex.c:1206 kobject: 'loop2' (000000002a26fb3f): kobject_uevent_env mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 kobject: 'loop2' (000000002a26fb3f): fill_kobj_path: path = '/devices/virtual/block/loop2' ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 kobject: 'loop3' (00000000205d86eb): kobject_uevent_env ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 kobject: 'loop3' (00000000205d86eb): fill_kobj_path: path = '/devices/virtual/block/loop3' vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 kobject: 'loop4' (000000000512da6a): kobject_uevent_env __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+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop4' (000000000512da6a): fill_kobj_path: path = '/devices/virtual/block/loop4' RSP: 002b:00007f716275bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000018 RSI: 0000000020000040 RDI: 0000000000000007 RBP: 000000000073c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f716275c6d4 R13: 00000000004cd828 R14: 00000000004dcae8 R15: 00000000ffffffff Allocated by task 21410: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:509 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615 kmalloc include/linux/slab.h:545 [inline] ucma_open+0x4f/0x290 drivers/infiniband/core/ucma.c:1721 misc_open+0x398/0x4c0 drivers/char/misc.c:141 chrdev_open+0x247/0x6b0 fs/char_dev.c:417 do_dentry_open+0x47d/0x1130 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x10d7/0x4690 fs/namei.c:3534 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_sys_open+0x3fe/0x5d0 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+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21403: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kfree+0xcf/0x230 mm/slab.c:3811 ucma_close+0x291/0x320 drivers/infiniband/core/ucma.c:1780 __fput+0x2df/0x8d0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x14a/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x273/0x2c0 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+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a0722ac0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff8880a0722ac0, ffff8880a0722bc0) The buggy address belongs to the page: page:ffffea000281c880 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002662a88 ffffea00027e5d48 ffff88812c3f07c0 raw: 0000000000000000 ffff8880a07220c0 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a0722980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a0722a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a0722a80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8880a0722b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a0722b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================