Hello, syzbot found the following issue on: HEAD commit: d98f554b Add linux-next specific files for 20210312 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1189318ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e362835d2e58cef6 dashboard link: https://syzkaller.appspot.com/bug?extid=0a0e8ecea895d38332e6 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0a0e8ecea895d38332e6@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3161 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xe5/0x7f0 mm/slub.c:4215 CPU: 0 PID: 10481 Comm: syz-executor.5 Not tainted 5.12.0-rc2-next-20210312-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+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:357 ____kasan_slab_free mm/kasan/common.c:340 [inline] __kasan_slab_free+0x118/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4215 scsi_req_free_cmd include/scsi/scsi_request.h:28 [inline] sg_finish_scsi_blk_rq+0x690/0x810 drivers/scsi/sg.c:3224 sg_common_write+0xa07/0xe70 drivers/scsi/sg.c:1132 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_ctl_sg_io drivers/scsi/sg.c:1785 [inline] sg_ioctl_common+0x3c86/0x97f0 drivers/scsi/sg.c:2014 sg_ioctl+0x7c/0x110 drivers/scsi/sg.c:2229 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 RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8413efa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020001780 RSI: 0000000000002285 RDI: 0000000000000003 RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffe20e16e2f R14: 00007f8413efa300 R15: 0000000000022000 Allocated by task 10481: 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:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:686 [inline] sg_start_req+0x16f/0x24e0 drivers/scsi/sg.c:3044 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_ctl_sg_io drivers/scsi/sg.c:1785 [inline] sg_ioctl_common+0x3c86/0x97f0 drivers/scsi/sg.c:2014 sg_ioctl+0x7c/0x110 drivers/scsi/sg.c:2229 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 Freed by task 10481: 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:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4215 sg_start_req+0x1b33/0x24e0 drivers/scsi/sg.c:3106 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_ctl_sg_io drivers/scsi/sg.c:1785 [inline] sg_ioctl_common+0x3c86/0x97f0 drivers/scsi/sg.c:2014 sg_ioctl+0x7c/0x110 drivers/scsi/sg.c:2229 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 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 kvfree_call_rcu+0x74/0x8c0 kernel/rcu/tree.c:3597 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1646 unregister_sysctl_table fs/proc/proc_sysctl.c:1684 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1659 mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1442 [inline] mpls_dev_notify+0x64d/0x8b0 net/mpls/af_mpls.c:1632 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2063 call_netdevice_notifiers_extack net/core/dev.c:2075 [inline] call_netdevice_notifiers net/core/dev.c:2089 [inline] dev_change_name+0x447/0x690 net/core/dev.c:1346 do_setlink+0x2c1f/0x3a70 net/core/rtnetlink.c:2688 __rtnl_newlink+0xdc6/0x1710 net/core/rtnetlink.c:3376 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985 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 ffff88802ae5f400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff88802ae5f400, ffff88802ae5f500) The buggy address belongs to the page: page:ffffea0000ab9780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ae5e head:ffffea0000ab9780 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000600000001 ffff888010841b40 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802ae5f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802ae5f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802ae5f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802ae5f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802ae5f500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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