================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3f18/0x57d0 kernel/locking/lockdep.c:4770 Read of size 8 at addr ffff88802006b268 by task ksoftirqd/0/12 CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.12.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x93/0xc2 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 __lock_acquire+0x3f18/0x57d0 kernel/locking/lockdep.c:4770 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:137 req_bio_endio block/blk-core.c:265 [inline] blk_update_request+0x73e/0x11d0 block/blk-core.c:1456 blk_mq_end_request+0x46/0x480 block/blk-mq.c:564 blk_complete_reqs+0x90/0xc0 block/blk-mq.c:576 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 run_ksoftirqd kernel/softirq.c:652 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:644 smpboot_thread_fn+0x561/0x8e0 kernel/smpboot.c:165 kthread+0x36f/0x450 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 13474: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] __kasan_kmalloc+0x7a/0x90 mm/kasan/common.c:515 kmalloc include/linux/slab.h:554 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1829 [inline] lmLogInit+0x300/0x12b0 fs/jfs/jfs_logmgr.c:1278 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline] lmLogOpen+0x67d/0x1010 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0x229/0x430 fs/jfs/jfs_mount.c:260 jfs_fill_super+0x78c/0xb10 fs/jfs/super.c:570 mount_bdev+0x2cb/0x3b0 fs/super.c:1367 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:592 vfs_get_tree+0x7f/0x2c0 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 13474: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xda/0x110 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x51/0x130 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xdb/0x3c0 mm/slub.c:4213 lbmLogShutdown fs/jfs/jfs_logmgr.c:1872 [inline] lmLogInit+0x896/0x12b0 fs/jfs/jfs_logmgr.c:1423 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline] lmLogOpen+0x67d/0x1010 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0x229/0x430 fs/jfs/jfs_mount.c:260 jfs_fill_super+0x78c/0xb10 fs/jfs/super.c:570 mount_bdev+0x2cb/0x3b0 fs/super.c:1367 legacy_get_tree+0xfa/0x1f0 fs/fs_context.c:592 vfs_get_tree+0x7f/0x2c0 fs/super.c:1497 do_new_mount fs/namespace.c:2903 [inline] path_mount+0x7f3/0x1a40 fs/namespace.c:3233 do_mount fs/namespace.c:3246 [inline] __do_sys_mount fs/namespace.c:3454 [inline] __se_sys_mount fs/namespace.c:3431 [inline] __x64_sys_mount+0x1f5/0x260 fs/namespace.c:3431 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:345 insert_work+0x42/0x300 kernel/workqueue.c:1331 __queue_work+0x497/0xcb0 kernel/workqueue.c:1497 queue_work_on+0x64/0x70 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1b8/0x430 kernel/umh.c:433 kobject_uevent_env+0xc6f/0x12c0 lib/kobject_uevent.c:617 __loop_clr_fd+0x60c/0xf50 drivers/block/loop.c:1248 __blkdev_put+0x460/0x6c0 fs/block_dev.c:1588 blkdev_put+0x75/0x480 fs/block_dev.c:1641 blkdev_close+0x8b/0xd0 fs/block_dev.c:1649 __fput+0x209/0x870 fs/file_table.c:280 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:345 insert_work+0x42/0x300 kernel/workqueue.c:1331 __queue_work+0x497/0xcb0 kernel/workqueue.c:1497 queue_work_on+0x64/0x70 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1b8/0x430 kernel/umh.c:433 kobject_uevent_env+0xc6f/0x12c0 lib/kobject_uevent.c:617 loop_configure+0xdaf/0x10c0 drivers/block/loop.c:255 lo_ioctl+0x3b9/0x1540 drivers/block/loop.c:1689 blkdev_ioctl+0x24c/0x5f0 block/ioctl.c:583 block_ioctl+0xd4/0x130 fs/block_dev.c:1667 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802006b200 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 104 bytes inside of 192-byte region [ffff88802006b200, ffff88802006b2c0) The buggy address belongs to the page: page:0000000020a6842d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2006b flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea000042e3c0 0000000200000002 ffff88800ec41a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802006b100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802006b180: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802006b200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802006b280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802006b300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================