===================================== WARNING: bad unlock balance detected! 4.19.56 #28 Not tainted ------------------------------------- syz-executor.2/29946 is trying to release lock (&file->mut) at: [] ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor.2/29946: #0: 000000000a1b9d0a (&file->mut){+.+.}, at: ucma_destroy_id+0x1e9/0x4a0 drivers/infiniband/core/ucma.c:626 stack backtrace: CPU: 1 PID: 29946 Comm: syz-executor.2 Not tainted 4.19.56 #28 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop3' (00000000636a0228): kobject_uevent_env Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 kobject: 'loop3' (00000000636a0228): fill_kobj_path: path = '/devices/virtual/block/loop3' print_unlock_imbalance_bug kernel/locking/lockdep.c:3464 [inline] print_unlock_imbalance_bug.cold+0x114/0x123 kernel/locking/lockdep.c:3441 __lock_release kernel/locking/lockdep.c:3671 [inline] lock_release+0x6cd/0xa30 kernel/locking/lockdep.c:3919 kobject: 'loop5' (00000000a8c0b7ee): kobject_uevent_env __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+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689 kobject: 'loop5' (00000000a8c0b7ee): fill_kobj_path: path = '/devices/virtual/block/loop5' __vfs_write+0x114/0x810 fs/read_write.c:485 vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4a0f729c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 kobject: 'loop0' (000000003547b901): kobject_uevent_env RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 0000000020000118 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a0f72a6d4 R13: 00000000004d0138 R14: 00000000004e02c8 R15: 00000000ffffffff kobject: 'loop0' (000000003547b901): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (00000000a8c0b7ee): kobject_uevent_env kobject: 'loop5' (00000000a8c0b7ee): fill_kobj_path: path = '/devices/virtual/block/loop5' ================================================================== 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 kobject: 'loop3' (00000000636a0228): kobject_uevent_env Read of size 8 at addr ffff88809fb5cdc0 by task syz-executor.2/29946 CPU: 0 PID: 29946 Comm: syz-executor.2 Not tainted 4.19.56 #28 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 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kobject: 'loop3' (00000000636a0228): fill_kobj_path: path = '/devices/virtual/block/loop3' kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 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+0x9b/0x6b0 kernel/locking/mutex.c:1206 kobject: 'loop1' (00000000f2f13518): kobject_uevent_env mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ucma_destroy_id+0x24c/0x4a0 drivers/infiniband/core/ucma.c:628 kobject: 'loop1' (00000000f2f13518): fill_kobj_path: path = '/devices/virtual/block/loop1' ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1689 kobject: 'loop0' (000000003547b901): kobject_uevent_env __vfs_write+0x114/0x810 fs/read_write.c:485 kobject: 'loop0' (000000003547b901): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000636a0228): kobject_uevent_env kobject: 'loop3' (00000000636a0228): fill_kobj_path: path = '/devices/virtual/block/loop3' vfs_write+0x20c/0x560 fs/read_write.c:549 ksys_write+0x14f/0x2d0 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:608 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459519 Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4a0f729c78 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: 00007f4a0f72a6d4 R13: 00000000004d0138 R14: 00000000004e02c8 R15: 00000000ffffffff Allocated by task 29946: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kmem_cache_alloc_trace+0x152/0x760 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] ucma_open+0x4f/0x290 drivers/infiniband/core/ucma.c:1721 misc_open+0x395/0x4c0 drivers/char/misc.c:141 chrdev_open+0x245/0x6b0 fs/char_dev.c:423 do_dentry_open+0x4c3/0x1200 fs/open.c:777 vfs_open+0xa0/0xd0 fs/open.c:886 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/0x550 fs/open.c:1069 __do_sys_openat fs/open.c:1096 [inline] __se_sys_openat fs/open.c:1090 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1090 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 29931: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 ucma_close+0x291/0x320 drivers/infiniband/core/ucma.c:1780 __fput+0x2dd/0x8b0 fs/file_table.c:278 ____fput+0x16/0x20 fs/file_table.c:309 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x273/0x2c0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x53d/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809fb5cdc0 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff88809fb5cdc0, ffff88809fb5cec0) The buggy address belongs to the page: page:ffffea00027ed700 count:1 mapcount:0 mapping:ffff88812c3f07c0 index:0x0 flags: 0x1fffc0000000100(slab) raw: 01fffc0000000100 ffffea0002a8b108 ffffea00029a3f88 ffff88812c3f07c0 raw: 0000000000000000 ffff88809fb5c000 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809fb5cc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809fb5cd00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc >ffff88809fb5cd80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff88809fb5ce00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809fb5ce80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================