================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3e6f/0x54c0 kernel/locking/lockdep.c:4770 Read of size 8 at addr ffff88801889a568 by task ksoftirqd/0/12 CPU: 0 PID: 12 Comm: ksoftirqd/0 Not tainted 5.11.0-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+0xfa/0x151 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 __lock_acquire+0x3e6f/0x54c0 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 lbmIODone+0x44b/0xf60 fs/jfs/jfs_logmgr.c:2294 bio_endio+0x3f4/0x800 block/bio.c:1436 req_bio_endio block/blk-core.c:264 [inline] blk_update_request+0x68b/0x1480 block/blk-core.c:1455 blk_mq_end_request+0x4c/0x510 block/blk-mq.c:564 lo_complete_rq+0x20d/0x2d0 drivers/block/loop.c:497 blk_complete_reqs+0x9d/0xd0 block/blk-mq.c:576 __do_softirq+0x29b/0x9f6 kernel/softirq.c:343 run_ksoftirqd kernel/softirq.c:650 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:642 smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Allocated by task 2409: 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:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc include/linux/slab.h:554 [inline] lbmLogInit fs/jfs/jfs_logmgr.c:1829 [inline] lmLogInit+0x30b/0x1420 fs/jfs/jfs_logmgr.c:1278 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline] lmLogOpen+0x759/0x1250 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0x286/0x4c0 fs/jfs/jfs_mount.c:260 jfs_fill_super+0x860/0xbc0 fs/jfs/super.c:571 mount_bdev+0x34d/0x410 fs/super.c:1367 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:2916 [inline] path_mount+0x132a/0x1f90 fs/namespace.c:3246 do_mount fs/namespace.c:3259 [inline] __do_sys_mount fs/namespace.c:3467 [inline] __se_sys_mount fs/namespace.c:3444 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3444 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 2409: 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:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:192 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x51/0x130 mm/slub.c:1580 slab_free mm/slub.c:3143 [inline] kfree+0xdb/0x3b0 mm/slub.c:4179 lbmLogShutdown fs/jfs/jfs_logmgr.c:1872 [inline] lmLogInit+0x94a/0x1420 fs/jfs/jfs_logmgr.c:1423 open_inline_log fs/jfs/jfs_logmgr.c:1183 [inline] lmLogOpen+0x759/0x1250 fs/jfs/jfs_logmgr.c:1077 jfs_mount_rw+0x286/0x4c0 fs/jfs/jfs_mount.c:260 jfs_fill_super+0x860/0xbc0 fs/jfs/super.c:571 mount_bdev+0x34d/0x410 fs/super.c:1367 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1497 do_new_mount fs/namespace.c:2916 [inline] path_mount+0x132a/0x1f90 fs/namespace.c:3246 do_mount fs/namespace.c:3259 [inline] __do_sys_mount fs/namespace.c:3467 [inline] __se_sys_mount fs/namespace.c:3444 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3444 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:344 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xf00 kernel/workqueue.c:1497 queue_work_on+0xae/0xc0 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:433 kobject_uevent_env+0xf9f/0x1680 lib/kobject_uevent.c:617 kobject_synth_uevent+0x701/0x850 lib/kobject_uevent.c:208 uevent_store+0x20/0x50 drivers/base/core.c:2288 dev_attr_store+0x50/0x80 drivers/base/core.c:1989 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x796/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 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:344 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xf00 kernel/workqueue.c:1497 queue_work_on+0xae/0xc0 kernel/workqueue.c:1524 queue_work include/linux/workqueue.h:507 [inline] call_usermodehelper_exec+0x1f0/0x4c0 kernel/umh.c:433 kobject_uevent_env+0xf9f/0x1680 lib/kobject_uevent.c:617 __loop_clr_fd+0x5ea/0xf10 drivers/block/loop.c:1245 loop_clr_fd drivers/block/loop.c:1333 [inline] lo_ioctl+0x3b9/0x1620 drivers/block/loop.c:1691 blkdev_ioctl+0x2a1/0x6d0 block/ioctl.c:576 block_ioctl+0xf9/0x140 fs/block_dev.c:1658 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+0x193/0x200 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 ffff88801889a500 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 104 bytes inside of 192-byte region [ffff88801889a500, ffff88801889a5c0) The buggy address belongs to the page: page:00000000d15ceb68 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1889a flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00005fa000 0000000a0000000a ffff888010c41500 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801889a400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801889a480: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88801889a500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801889a580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801889a600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================