[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 1027.201781] ================================================================== [ 1027.209292] BUG: KASAN: use-after-free in refcount_dec_not_one+0x9a/0xc0 [ 1027.216119] Read of size 4 at addr ffff8880978c5858 by task syz-executor231/24378 [ 1027.223711] [ 1027.225317] CPU: 0 PID: 24378 Comm: syz-executor231 Not tainted 4.14.295-syzkaller #0 [ 1027.233271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 1027.242596] Call Trace: [ 1027.245160] dump_stack+0x1b2/0x281 [ 1027.248766] print_address_description.cold+0x54/0x1d3 [ 1027.254017] kasan_report_error.cold+0x8a/0x191 [ 1027.258660] ? refcount_dec_not_one+0x9a/0xc0 [ 1027.263131] __asan_report_load4_noabort+0x68/0x70 [ 1027.268033] ? refcount_dec_not_one+0x9a/0xc0 [ 1027.272500] refcount_dec_not_one+0x9a/0xc0 [ 1027.276805] refcount_dec_and_mutex_lock+0x1a/0x60 [ 1027.281710] nbd_genl_connect+0xce1/0x13e0 [ 1027.285920] ? nbd_xmit_timeout+0x500/0x500 [ 1027.290217] ? validate_nla+0x192/0x5e0 [ 1027.294170] ? nla_parse+0x157/0x1f0 [ 1027.297861] genl_family_rcv_msg+0x572/0xb20 [ 1027.302245] ? genl_rcv+0x40/0x40 [ 1027.305675] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1027.311099] ? __kmalloc_node_track_caller+0x4c/0x70 [ 1027.316181] ? trace_hardirqs_on+0x10/0x10 [ 1027.320394] genl_rcv_msg+0xaf/0x140 [ 1027.324081] netlink_rcv_skb+0x125/0x390 [ 1027.328116] ? genl_family_rcv_msg+0xb20/0xb20 [ 1027.332670] ? netlink_ack+0x9a0/0x9a0 [ 1027.336531] ? lock_acquire+0x170/0x3f0 [ 1027.340479] genl_rcv+0x24/0x40 [ 1027.343732] netlink_unicast+0x437/0x610 [ 1027.347768] ? netlink_sendskb+0xd0/0xd0 [ 1027.351801] ? __check_object_size+0x179/0x230 [ 1027.356357] netlink_sendmsg+0x648/0xbc0 [ 1027.360396] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.364346] ? kernel_recvmsg+0x210/0x210 [ 1027.368471] ? security_socket_sendmsg+0x83/0xb0 [ 1027.373205] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.377159] sock_sendmsg+0xb5/0x100 [ 1027.380868] ___sys_sendmsg+0x6c8/0x800 [ 1027.384814] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 1027.389546] ? netlink_dump+0xb90/0xb90 [ 1027.393493] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.397449] ? security_socket_recvmsg+0x8b/0xc0 [ 1027.402179] ? SyS_recvfrom+0x27f/0x340 [ 1027.406224] ? SyS_send+0x40/0x40 [ 1027.409654] ? vm_insert_page+0x7c0/0x7c0 [ 1027.413777] ? __fdget+0x167/0x1f0 [ 1027.417379] ? sockfd_lookup_light+0xb2/0x160 [ 1027.421849] __sys_sendmsg+0xa3/0x120 [ 1027.425625] ? SyS_shutdown+0x160/0x160 [ 1027.429578] ? up_read+0x17/0x30 [ 1027.432920] ? __do_page_fault+0x159/0xad0 [ 1027.437141] SyS_sendmsg+0x27/0x40 [ 1027.440659] ? __sys_sendmsg+0x120/0x120 [ 1027.444694] do_syscall_64+0x1d5/0x640 [ 1027.448559] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1027.453724] RIP: 0033:0x7fc03c2e9dd9 [ 1027.457410] RSP: 002b:00007fffca29d068 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 1027.465096] RAX: ffffffffffffffda RBX: 00000000000facb5 RCX: 00007fc03c2e9dd9 [ 1027.472340] RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 [ 1027.479584] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1027.486829] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffca29d09c [ 1027.494079] R13: 431bde82d7b634db R14: 00007fffca29d0b0 R15: 0000000000000000 [ 1027.501327] [ 1027.502929] Allocated by task 24376: [ 1027.506624] kasan_kmalloc+0xeb/0x160 [ 1027.510403] kmem_cache_alloc_trace+0x131/0x3d0 [ 1027.515053] nbd_dev_add+0x7c/0x800 [ 1027.518655] nbd_genl_connect+0x3a4/0x13e0 [ 1027.522864] genl_family_rcv_msg+0x572/0xb20 [ 1027.527244] genl_rcv_msg+0xaf/0x140 [ 1027.530930] netlink_rcv_skb+0x125/0x390 [ 1027.534967] genl_rcv+0x24/0x40 [ 1027.538221] netlink_unicast+0x437/0x610 [ 1027.542258] netlink_sendmsg+0x648/0xbc0 [ 1027.546294] sock_sendmsg+0xb5/0x100 [ 1027.549982] ___sys_sendmsg+0x6c8/0x800 [ 1027.553930] __sys_sendmsg+0xa3/0x120 [ 1027.557703] SyS_sendmsg+0x27/0x40 [ 1027.561223] do_syscall_64+0x1d5/0x640 [ 1027.565087] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1027.570257] [ 1027.571895] Freed by task 24378: [ 1027.575243] kasan_slab_free+0xc3/0x1a0 [ 1027.579195] kfree+0xc9/0x250 [ 1027.582283] nbd_put.part.0+0x100/0x140 [ 1027.586238] nbd_config_put+0x51c/0x6c0 [ 1027.590214] nbd_genl_connect+0xcb9/0x13e0 [ 1027.594426] genl_family_rcv_msg+0x572/0xb20 [ 1027.598810] genl_rcv_msg+0xaf/0x140 [ 1027.602496] netlink_rcv_skb+0x125/0x390 [ 1027.606531] genl_rcv+0x24/0x40 [ 1027.609787] netlink_unicast+0x437/0x610 [ 1027.613822] netlink_sendmsg+0x648/0xbc0 [ 1027.617865] sock_sendmsg+0xb5/0x100 [ 1027.621557] ___sys_sendmsg+0x6c8/0x800 [ 1027.625508] __sys_sendmsg+0xa3/0x120 [ 1027.629295] SyS_sendmsg+0x27/0x40 [ 1027.632817] do_syscall_64+0x1d5/0x640 [ 1027.636694] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1027.641859] [ 1027.643469] The buggy address belongs to the object at ffff8880978c5780 [ 1027.643469] which belongs to the cache kmalloc-512 of size 512 [ 1027.656107] The buggy address is located 216 bytes inside of [ 1027.656107] 512-byte region [ffff8880978c5780, ffff8880978c5980) [ 1027.668047] The buggy address belongs to the page: [ 1027.673014] page:ffffea00025e3140 count:1 mapcount:0 mapping:ffff8880978c5000 index:0x0 [ 1027.681139] flags: 0xfff00000000100(slab) [ 1027.685265] raw: 00fff00000000100 ffff8880978c5000 0000000000000000 0000000100000006 [ 1027.693140] raw: ffffea0002d334e0 ffffea0002d242e0 ffff88813fe74940 0000000000000000 [ 1027.701269] page dumped because: kasan: bad access detected [ 1027.706954] [ 1027.708558] Memory state around the buggy address: [ 1027.713463] ffff8880978c5700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 1027.720799] ffff8880978c5780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1027.728133] >ffff8880978c5800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1027.735465] ^ [ 1027.741670] ffff8880978c5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1027.749008] ffff8880978c5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1027.756344] ================================================================== [ 1027.763684] Disabling lock debugging due to kernel taint [ 1027.769484] Kernel panic - not syncing: panic_on_warn set ... [ 1027.769484] [ 1027.776852] CPU: 0 PID: 24378 Comm: syz-executor231 Tainted: G B 4.14.295-syzkaller #0 [ 1027.786025] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 [ 1027.795454] Call Trace: [ 1027.798040] dump_stack+0x1b2/0x281 [ 1027.801663] panic+0x1f9/0x42d [ 1027.804842] ? add_taint.cold+0x16/0x16 [ 1027.808800] ? ___preempt_schedule+0x16/0x18 [ 1027.813193] kasan_end_report+0x43/0x49 [ 1027.817155] kasan_report_error.cold+0xa7/0x191 [ 1027.821803] ? refcount_dec_not_one+0x9a/0xc0 [ 1027.826284] __asan_report_load4_noabort+0x68/0x70 [ 1027.831202] ? refcount_dec_not_one+0x9a/0xc0 [ 1027.835674] refcount_dec_not_one+0x9a/0xc0 [ 1027.839972] refcount_dec_and_mutex_lock+0x1a/0x60 [ 1027.844877] nbd_genl_connect+0xce1/0x13e0 [ 1027.849087] ? nbd_xmit_timeout+0x500/0x500 [ 1027.853389] ? validate_nla+0x192/0x5e0 [ 1027.857336] ? nla_parse+0x157/0x1f0 [ 1027.861025] genl_family_rcv_msg+0x572/0xb20 [ 1027.865412] ? genl_rcv+0x40/0x40 [ 1027.868839] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 1027.874269] ? __kmalloc_node_track_caller+0x4c/0x70 [ 1027.879363] ? trace_hardirqs_on+0x10/0x10 [ 1027.883588] genl_rcv_msg+0xaf/0x140 [ 1027.887284] netlink_rcv_skb+0x125/0x390 [ 1027.891331] ? genl_family_rcv_msg+0xb20/0xb20 [ 1027.895889] ? netlink_ack+0x9a0/0x9a0 [ 1027.899751] ? lock_acquire+0x170/0x3f0 [ 1027.903710] genl_rcv+0x24/0x40 [ 1027.906968] netlink_unicast+0x437/0x610 [ 1027.911002] ? netlink_sendskb+0xd0/0xd0 [ 1027.915046] ? __check_object_size+0x179/0x230 [ 1027.919601] netlink_sendmsg+0x648/0xbc0 [ 1027.923640] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.927589] ? kernel_recvmsg+0x210/0x210 [ 1027.931710] ? security_socket_sendmsg+0x83/0xb0 [ 1027.936444] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.940393] sock_sendmsg+0xb5/0x100 [ 1027.944088] ___sys_sendmsg+0x6c8/0x800 [ 1027.948040] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 1027.952772] ? netlink_dump+0xb90/0xb90 [ 1027.956723] ? nlmsg_notify+0x1b0/0x1b0 [ 1027.960677] ? security_socket_recvmsg+0x8b/0xc0 [ 1027.965414] ? SyS_recvfrom+0x27f/0x340 [ 1027.969364] ? SyS_send+0x40/0x40 [ 1027.972792] ? vm_insert_page+0x7c0/0x7c0 [ 1027.976916] ? __fdget+0x167/0x1f0 [ 1027.980431] ? sockfd_lookup_light+0xb2/0x160 [ 1027.984900] __sys_sendmsg+0xa3/0x120 [ 1027.988675] ? SyS_shutdown+0x160/0x160 [ 1027.992623] ? up_read+0x17/0x30 [ 1027.995965] ? __do_page_fault+0x159/0xad0 [ 1028.000174] SyS_sendmsg+0x27/0x40 [ 1028.003686] ? __sys_sendmsg+0x120/0x120 [ 1028.007720] do_syscall_64+0x1d5/0x640 [ 1028.011582] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1028.016745] RIP: 0033:0x7fc03c2e9dd9 [ 1028.020430] RSP: 002b:00007fffca29d068 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 1028.028119] RAX: ffffffffffffffda RBX: 00000000000facb5 RCX: 00007fc03c2e9dd9 [ 1028.035364] RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000003 [ 1028.042607] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1028.049852] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffca29d09c [ 1028.057100] R13: 431bde82d7b634db R14: 00007fffca29d0b0 R15: 0000000000000000 [ 1028.064516] Kernel Offset: disabled [ 1028.068124] Rebooting in 86400 seconds..