================================================================== BUG: KASAN: use-after-free in blk_mq_sched_free_rqs+0x211/0x250 block/blk-mq-sched.c:631 Read of size 4 at addr ffff88807a40c858 by task udevd/24813 CPU: 0 PID: 24813 Comm: udevd Not tainted 5.18.0-rc1-next-20220406-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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 blk_mq_sched_free_rqs+0x211/0x250 block/blk-mq-sched.c:631 elevator_exit+0x3b/0x70 block/elevator.c:196 disk_release_mq block/genhd.c:1139 [inline] disk_release+0x17c/0x420 block/genhd.c:1168 device_release+0x9f/0x240 drivers/base/core.c:2229 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 put_device+0x1b/0x30 drivers/base/core.c:3512 blkdev_close+0x64/0x80 block/fops.c:517 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fdf0d925fc3 Code: 48 ff ff ff b8 ff ff ff ff e9 3e ff ff ff 66 0f 1f 84 00 00 00 00 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 RSP: 002b:00007ffe741289f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007fdf0dc946a8 RCX: 00007fdf0d925fc3 RDX: 0000000003938700 RSI: 000000000aba9500 RDI: 0000000000000008 RBP: 0000564522ee2ff0 R08: 0000000000000001 R09: 0000564522edd1b0 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000002 R13: 0000564522ee13b0 R14: 0000000000000008 R15: 0000564522eba910 Allocated by task 30674: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] nbd_dev_add+0x4d/0xcd0 drivers/block/nbd.c:1730 nbd_genl_connect+0x11f3/0x1930 drivers/block/nbd.c:1948 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e2/0x800 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 29407: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xd6/0x4d0 mm/slub.c:4560 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x62e/0x1140 kernel/workqueue.c:1517 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:503 [inline] nbd_put drivers/block/nbd.c:279 [inline] nbd_put+0xd7/0x120 drivers/block/nbd.c:272 blkdev_put_whole+0xbb/0xf0 block/bdev.c:689 blkdev_put+0x226/0x770 block/bdev.c:947 blkdev_close+0x64/0x80 block/fops.c:517 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3595 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1705 unregister_sysctl_table fs/proc/proc_sysctl.c:1743 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1718 neigh_sysctl_unregister+0x5b/0x80 net/core/neighbour.c:3812 addrconf_ifdown.isra.0+0x12e5/0x16b0 net/ipv6/addrconf.c:3885 addrconf_notify+0xeb/0x1ba0 net/ipv6/addrconf.c:3662 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1938 call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] unregister_netdevice_many+0x92e/0x1890 net/core/dev.c:10751 default_device_exit_batch+0x449/0x590 net/core/dev.c:11245 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88807a40c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 88 bytes inside of 1024-byte region [ffff88807a40c800, ffff88807a40cc00) The buggy address belongs to the physical page: page:ffffea0001e90200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807a40f800 pfn:0x7a408 head:ffffea0001e90200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001720008 ffffea00018b0808 ffff888010c41dc0 raw: ffff88807a40f800 000000000010000e 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3605, tgid 3605 (syz-executor.1), ts 63363634661, free_ts 63345723413 prep_new_page mm/page_alloc.c:2394 [inline] get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4135 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5356 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8d0/0xf30 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4955 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1300 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_rt_notify+0xec/0x2b0 net/ipv6/route.c:6160 fib6_add_rt2node net/ipv6/ip6_fib.c:1252 [inline] fib6_add+0x26e7/0x3f10 net/ipv6/ip6_fib.c:1478 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_route_add+0x8b/0x150 net/ipv6/route.c:3846 addrconf_prefix_route+0x30a/0x4e0 net/ipv6/addrconf.c:2418 fixup_permanent_addr net/ipv6/addrconf.c:3469 [inline] addrconf_permanent_addr net/ipv6/addrconf.c:3493 [inline] addrconf_notify+0x1285/0x1ba0 net/ipv6/addrconf.c:3561 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1938 call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8471 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1309 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1359 free_unref_page_prepare mm/page_alloc.c:3281 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3376 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] __kmalloc_node+0x23a/0x390 mm/slub.c:4466 kmalloc_node include/linux/slab.h:604 [inline] kzalloc_node include/linux/slab.h:725 [inline] qdisc_alloc+0xac/0xa10 net/sched/sch_generic.c:941 qdisc_create_dflt+0x71/0x4b0 net/sched/sch_generic.c:1000 attach_one_default_qdisc net/sched/sch_generic.c:1148 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2385 [inline] attach_default_qdiscs net/sched/sch_generic.c:1166 [inline] dev_activate+0x75d/0xcd0 net/sched/sch_generic.c:1224 __dev_open+0x388/0x4d0 net/core/dev.c:1434 __dev_change_flags+0x583/0x750 net/core/dev.c:8433 dev_change_flags+0x93/0x170 net/core/dev.c:8504 do_setlink+0x96d/0x3a20 net/core/rtnetlink.c:2764 __rtnl_newlink+0xba0/0x16e0 net/core/rtnetlink.c:3449 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3564 Memory state around the buggy address: ffff88807a40c700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a40c780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807a40c800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a40c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a40c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================