================================================================== ================================================================== 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 ffff88801c9dc058 by task udevd/27631 CPU: 1 PID: 27631 Comm: udevd Not tainted 5.19.0-rc1-syzkaller-00373-g6ac6dc746d70 #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:1141 [inline] disk_release+0x17c/0x420 block/genhd.c:1170 device_release+0x9f/0x240 drivers/base/core.c:2230 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:3524 blkdev_close+0x64/0x80 block/fops.c:495 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 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+0x46/0xb0 RIP: 0033:0x7f7eb7f25fc3 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:00007ffcd26b0c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f7eb828e6a8 RCX: 00007f7eb7f25fc3 RDX: 0000000003938700 RSI: 000000000aba9500 RDI: 0000000000000008 RBP: 0000559a94d4b190 R08: 0000000000000001 R09: 0000559a94d594e0 R10: 00000000000001b6 R11: 0000000000000246 R12: 0000000000000002 R13: 0000559a94d49280 R14: 0000000000000008 R15: 0000559a94d25910 Allocated by task 13489: 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:600 [inline] kzalloc include/linux/slab.h:733 [inline] nbd_dev_add+0x4d/0xc20 drivers/block/nbd.c:1745 nbd_genl_connect+0x12d1/0x19e0 drivers/block/nbd.c:1963 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:2501 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+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2489 ___sys_sendmsg+0xf3/0x170 net/socket.c:2543 __sys_sendmsg net/socket.c:2572 [inline] __do_sys_sendmsg net/socket.c:2581 [inline] __se_sys_sendmsg net/socket.c:2579 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2579 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+0x46/0xb0 Freed by task 47: 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:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xd6/0x4d0 mm/slub.c:4555 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:302 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:502 [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:696 blkdev_put+0x226/0x770 block/bdev.c:954 blkdev_close+0x64/0x80 block/fops.c:495 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 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+0x46/0xb0 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 call_rcu+0x99/0x790 kernel/rcu/tree.c:3126 rxrpc_put_local+0xfa/0x130 net/rxrpc/local_object.c:325 rxrpc_release_sock net/rxrpc/af_rxrpc.c:891 [inline] rxrpc_release+0x2c9/0x5a0 net/rxrpc/af_rxrpc.c:917 __sock_release+0xcd/0x280 net/socket.c:650 sock_close+0x18/0x20 net/socket.c:1365 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 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+0x46/0xb0 The buggy address belongs to the object at ffff88801c9dc000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 88 bytes inside of 1024-byte region [ffff88801c9dc000, ffff88801c9dc400) The buggy address belongs to the physical page: page:ffffea0000727600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c9d8 head:ffffea0000727600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011841dc0 raw: 0000000000000000 0000000000100010 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3704, tgid 3704 (syz-executor.4), ts 53991745314, free_ts 53964974538 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:429 alloc_skb include/linux/skbuff.h:1249 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_fib+0x120/0x500 net/ipv4/fib_semantics.c:519 fib_table_insert+0x770/0x1bd0 net/ipv4/fib_trie.c:1399 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1098 fib_add_ifaddr+0x49b/0x540 net/ipv4/fib_frontend.c:1142 fib_netdev_event+0x462/0x680 net/ipv4/fib_frontend.c:1480 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1943 call_netdevice_notifiers_extack net/core/dev.c:1981 [inline] call_netdevice_notifiers net/core/dev.c:1995 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8587 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __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:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] kmem_cache_alloc_trace+0x26d/0x3f0 mm/slub.c:3253 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ____ip_mc_inc_group+0x244/0xc70 net/ipv4/igmp.c:1442 __ip_mc_inc_group net/ipv4/igmp.c:1477 [inline] ip_mc_inc_group net/ipv4/igmp.c:1483 [inline] ip_mc_up+0x14b/0x360 net/ipv4/igmp.c:1782 inetdev_event+0x2e8/0x15d0 net/ipv4/devinet.c:1577 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1943 call_netdevice_notifiers_extack net/core/dev.c:1981 [inline] call_netdevice_notifiers net/core/dev.c:1995 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8587 dev_change_flags+0x112/0x170 net/core/dev.c:8625 do_setlink+0x961/0x3bb0 net/core/rtnetlink.c:2780 __rtnl_newlink+0xd6a/0x17e0 net/core/rtnetlink.c:3546 Memory state around the buggy address: ffff88801c9dbf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801c9dbf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801c9dc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801c9dc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801c9dc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================