syzbot has found a reproducer for the following issue on: HEAD commit: a1f92694 Add linux-next specific files for 20210518 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=131a31a8300000 kernel config: https://syzkaller.appspot.com/x/.config?x=d612e75ffd53a6d3 dashboard link: https://syzkaller.appspot.com/bug?extid=77ba3d171a25c56756ea syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c901ebd00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1406b797d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+77ba3d171a25c56756ea@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in blk_mq_exit_sched+0x53e/0x6a0 block/blk-mq-sched.c:685 Read of size 4 at addr ffff88801e4101e0 by task systemd-udevd/8530 CPU: 0 PID: 8530 Comm: systemd-udevd Not tainted 5.13.0-rc2-next-20210518-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x13e/0x1d6 lib/dump_stack.c:129 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 blk_mq_exit_sched+0x53e/0x6a0 block/blk-mq-sched.c:685 __elevator_exit+0x28/0x40 block/elevator.c:194 blk_exit_queue block/blk-sysfs.c:760 [inline] blk_release_queue+0x25e/0x4d0 block/blk-sysfs.c:821 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 disk_release+0x1cd/0x250 block/genhd.c:1138 device_release+0x9f/0x240 drivers/base/core.c:2186 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3428 put_disk+0x44/0x60 block/genhd.c:1340 blkdev_put_no_open fs/block_dev.c:1400 [inline] blkdev_put+0x12c/0x580 fs/block_dev.c:1639 blkdev_close+0x8c/0xb0 fs/block_dev.c:1646 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 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+0x26f/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x3e/0xb0 arch/x86/entry/common.c:57 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa4e4ba4270 Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 RSP: 002b:00007ffd7a611fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fa4e4ba4270 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fa4e5a5e710 R08: 000055f7d1f4b2a0 R09: 000055f7d1f4b000 R10: 00007fa4e5a5e8c0 R11: 0000000000000246 R12: 0000000000000000 R13: 000055f7d1f3c370 R14: 0000000000000003 R15: 000000000000000e Allocated by task 3184: 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:431 [inline] ____kasan_kmalloc mm/kasan/common.c:510 [inline] ____kasan_kmalloc mm/kasan/common.c:469 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:519 kmalloc include/linux/slab.h:595 [inline] kzalloc include/linux/slab.h:720 [inline] scsi_host_alloc+0x2c/0xfc0 drivers/scsi/hosts.c:376 usb_stor_probe1+0x45/0x162b drivers/usb/storage/usb.c:952 storage_probe+0x6f5/0xaa0 drivers/usb/storage/usb.c:1134 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:938 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbe0/0x2100 drivers/base/core.c:3320 usb_set_configuration+0x113f/0x1910 drivers/usb/core/message.c:2164 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:938 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xbe0/0x2100 drivers/base/core.c:3320 usb_new_device.cold+0x721/0x1058 drivers/usb/core/hub.c:2556 hub_port_connect drivers/usb/core/hub.c:5276 [inline] hub_port_connect_change drivers/usb/core/hub.c:5416 [inline] port_event drivers/usb/core/hub.c:5562 [inline] hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5644 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 8530: 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:363 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:371 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1623 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1648 slab_free mm/slub.c:3208 [inline] kfree+0xeb/0x650 mm/slub.c:4274 device_release+0x9f/0x240 drivers/base/core.c:2186 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3428 device_release+0x9f/0x240 drivers/base/core.c:2186 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3428 scsi_device_dev_release_usercontext+0x927/0xd50 drivers/scsi/scsi_sysfs.c:503 execute_in_process_context+0x37/0x150 kernel/workqueue.c:3327 device_release+0x9f/0x240 drivers/base/core.c:2186 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3428 scsi_disk_put drivers/scsi/sd.c:692 [inline] sd_release+0x124/0x290 drivers/scsi/sd.c:1493 __blkdev_put+0x5d4/0x790 fs/block_dev.c:1585 blkdev_put+0x92/0x580 fs/block_dev.c:1638 blkdev_close+0x8c/0xb0 fs/block_dev.c:1646 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 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+0x26f/0x280 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 do_syscall_64+0x3e/0xb0 arch/x86/entry/common.c:57 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+0xe5/0x110 mm/kasan/generic.c:345 insert_work+0x48/0x370 kernel/workqueue.c:1331 __queue_work+0x5c1/0xed0 kernel/workqueue.c:1497 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417 expire_timers kernel/time/timer.c:1457 [inline] __run_timers.part.0+0x4a6/0xa50 kernel/time/timer.c:1731 __run_timers kernel/time/timer.c:1712 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744 __do_softirq+0x29b/0x9fb kernel/softirq.c:559 The buggy address belongs to the object at ffff88801e410000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 480 bytes inside of 8192-byte region [ffff88801e410000, ffff88801e412000) The buggy address belongs to the page: page:ffffea0000790400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e410 head:ffffea0000790400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011042280 raw: 0000000000000000 0000000080020002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3184, ts 80546542199, free_ts 80510680077 prep_new_page mm/page_alloc.c:2377 [inline] get_page_from_freelist+0x125c/0x2ed0 mm/page_alloc.c:4038 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5239 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1686 [inline] allocate_slab+0x2c2/0x4c0 mm/slub.c:1826 new_slab mm/slub.c:1889 [inline] new_slab_objects mm/slub.c:2635 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2798 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2838 slab_alloc_node mm/slub.c:2920 [inline] slab_alloc mm/slub.c:2962 [inline] __kmalloc+0x312/0x330 mm/slub.c:4112 kmalloc include/linux/slab.h:595 [inline] kzalloc include/linux/slab.h:720 [inline] scsi_host_alloc+0x2c/0xfc0 drivers/scsi/hosts.c:376 usb_stor_probe1+0x45/0x162b drivers/usb/storage/usb.c:952 storage_probe+0x6f5/0xaa0 drivers/usb/storage/usb.c:1134 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 really_probe+0x291/0xf60 drivers/base/dd.c:576 driver_probe_device+0x298/0x410 drivers/base/dd.c:763 __device_attach_driver+0x203/0x2c0 drivers/base/dd.c:870 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x228/0x4a0 drivers/base/dd.c:938 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1305 [inline] __free_pages_ok+0x4cb/0xf30 mm/page_alloc.c:1586 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2416 put_cpu_partial+0x13d/0x230 mm/slub.c:2452 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:441 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2954 [inline] slab_alloc mm/slub.c:2962 [inline] kmem_cache_alloc+0x285/0x4a0 mm/slub.c:2967 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:319 [inline] getname+0x8e/0xd0 fs/namei.c:209 do_sys_openat2+0xf5/0x420 fs/open.c:1190 do_sys_open fs/open.c:1212 [inline] __do_sys_open fs/open.c:1220 [inline] __se_sys_open fs/open.c:1216 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1216 do_syscall_64+0x31/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff88801e410080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e410100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801e410180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801e410200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e410280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
