================================================================== BUG: KASAN: use-after-free in blk_mq_sched_tags_teardown+0x2a1/0x2d0 block/blk-mq-sched.c:544 Read of size 4 at addr ffff88801d6081e0 by task systemd-udevd/17071 CPU: 1 PID: 17071 Comm: systemd-udevd Not tainted 5.15.0-rc6-next-20211020-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+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 blk_mq_sched_tags_teardown+0x2a1/0x2d0 block/blk-mq-sched.c:544 blk_mq_exit_sched+0x21f/0x300 block/blk-mq-sched.c:674 __elevator_exit+0x28/0x40 block/elevator.c:194 blk_exit_queue block/blk-sysfs.c:750 [inline] blk_release_queue+0x25c/0x490 block/blk-sysfs.c:804 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+0x173/0x230 block/genhd.c:1089 device_release+0x9f/0x240 drivers/base/core.c:2230 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:3501 blkdev_close+0x6a/0x80 block/fops.c:448 __fput+0x286/0x9f0 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:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fae41dae270 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:00007fff149c8278 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007fae41dae270 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007fae42c68710 R08: 0000560b94896eb0 R09: 0000560b94886000 R10: 00007fae42c688c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000560b94886e30 R14: 0000000000000003 R15: 000000000000000e Allocated by task 25: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:595 [inline] kzalloc include/linux/slab.h:724 [inline] scsi_host_alloc+0x2c/0x1120 drivers/scsi/hosts.c:382 usb_stor_probe1+0x45/0x162b drivers/usb/storage/usb.c:952 alauda_probe+0x89/0x1d0 drivers/usb/storage/alauda.c:1234 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x245/0xcc0 drivers/base/dd.c:596 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x228/0x4a0 drivers/base/dd.c:969 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc17/0x1ee0 drivers/base/core.c:3394 usb_set_configuration+0x101e/0x1900 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x245/0xcc0 drivers/base/dd.c:596 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:751 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:781 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:898 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 __device_attach+0x228/0x4a0 drivers/base/dd.c:969 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487 device_add+0xc17/0x1ee0 drivers/base/core.c:3394 usb_new_device.cold+0x63f/0x108e drivers/usb/core/hub.c:2563 hub_port_connect drivers/usb/core/hub.c:5348 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x2357/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Freed by task 17071: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1726 slab_free mm/slub.c:3491 [inline] kfree+0xf6/0x560 mm/slub.c:4539 device_release+0x9f/0x240 drivers/base/core.c:2230 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:3501 device_release+0x9f/0x240 drivers/base/core.c:2230 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:3501 scsi_device_dev_release_usercontext+0x97e/0xdd0 drivers/scsi/scsi_sysfs.c:502 execute_in_process_context+0x37/0x150 kernel/workqueue.c:3358 device_release+0x9f/0x240 drivers/base/core.c:2230 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:3501 scsi_device_put+0x74/0xa0 drivers/scsi/scsi.c:550 scsi_disk_put drivers/scsi/sd.c:691 [inline] sd_release+0x124/0x290 drivers/scsi/sd.c:1507 blkdev_put_whole block/bdev.c:693 [inline] blkdev_put+0x2fb/0x9e0 block/bdev.c:955 blkdev_close+0x6a/0x80 block/fops.c:448 __fput+0x286/0x9f0 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:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1353 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1519 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1461 [inline] __run_timers.part.0+0x49f/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 The buggy address belongs to the object at ffff88801d608000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 480 bytes inside of 8192-byte region [ffff88801d608000, ffff88801d60a000) The buggy address belongs to the page: page:ffffea0000758200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d608 head:ffffea0000758200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010c42280 raw: 0000000000000000 0000000000020002 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 16694, ts 460931050990, free_ts 460831390793 prep_new_page mm/page_alloc.c:2416 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4147 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5386 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab mm/slub.c:1907 [inline] new_slab+0x32d/0x4a0 mm/slub.c:1970 ___slab_alloc+0x947/0x1040 mm/slub.c:3001 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3088 slab_alloc_node mm/slub.c:3179 [inline] __kmalloc_node_track_caller+0x2d3/0x350 mm/slub.c:4934 kmalloc_reserve net/core/skbuff.c:352 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:424 alloc_skb include/linux/skbuff.h:1120 [inline] alloc_skb_with_frags+0x93/0x620 net/core/skbuff.c:6072 sock_alloc_send_pskb+0x783/0x910 net/core/sock.c:2575 raw_send_hdrinc net/ipv4/raw.c:371 [inline] raw_sendmsg+0x153a/0x2e50 net/ipv4/raw.c:660 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3080 inet_sendpage+0x103/0x140 net/ipv4/af_inet.c:832 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1336 [inline] free_pcp_prepare+0x373/0x870 mm/page_alloc.c:1387 free_unref_page_prepare mm/page_alloc.c:3307 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3386 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+0xa2/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3212 [inline] kmem_cache_alloc_node+0x25c/0x3d0 mm/slub.c:3248 __alloc_skb+0x215/0x340 net/core/skbuff.c:412 alloc_skb include/linux/skbuff.h:1120 [inline] alloc_skb_with_frags+0x93/0x620 net/core/skbuff.c:6072 sock_alloc_send_pskb+0x783/0x910 net/core/sock.c:2575 raw_send_hdrinc net/ipv4/raw.c:371 [inline] raw_sendmsg+0x153a/0x2e50 net/ipv4/raw.c:660 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 sock_no_sendpage+0xf6/0x140 net/core/sock.c:3080 inet_sendpage+0x103/0x140 net/ipv4/af_inet.c:832 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3504 kernel_sendpage net/socket.c:3501 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1003 Memory state around the buggy address: ffff88801d608080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d608100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801d608180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801d608200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801d608280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================