[ 15.683383][ T231] ================================================================== [ 15.683691][ T231] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0 [ 15.683921][ T231] Read of size 1 at addr ffff88800a84868c by task packetdrill/231 [ 15.684194][ T231] [ 15.684292][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full) [ 15.684298][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.684301][ T231] Call Trace: [ 15.684303][ T231] [ 15.684305][ T231] dump_stack_lvl+0x82/0xc0 [ 15.684312][ T231] print_address_description.constprop.0+0x2c/0x3a0 [ 15.684321][ T231] ? kobject_put+0xbb/0xd0 [ 15.684325][ T231] print_report+0xb4/0x270 [ 15.684328][ T231] ? kobject_put+0xbb/0xd0 [ 15.684332][ T231] ? kasan_addr_to_slab+0x21/0x70 [ 15.684336][ T231] ? kobject_put+0xbb/0xd0 [ 15.684339][ T231] kasan_report+0xca/0x100 [ 15.684343][ T231] ? kobject_put+0xbb/0xd0 [ 15.684348][ T231] kobject_put+0xbb/0xd0 [ 15.684352][ T231] netdev_run_todo+0x5f0/0xc60 [ 15.684358][ T231] ? rtnl_is_locked+0x15/0x20 [ 15.684362][ T231] ? netif_state_change+0x228/0x2c0 [ 15.684365][ T231] ? call_netdevice_notifiers_info+0x100/0x100 [ 15.684368][ T231] ? generic_xdp_install+0x410/0x410 [ 15.684372][ T231] ? tun_chr_close+0xae/0x1c0 [ 15.684380][ T231] tun_chr_close+0xc0/0x1c0 [ 15.684384][ T231] __fput+0x35c/0xa70 [ 15.684392][ T231] fput_close_sync+0xdd/0x1b0 [ 15.684395][ T231] ? alloc_file_clone+0xf0/0xf0 [ 15.684400][ T231] __x64_sys_close+0x7d/0xd0 [ 15.684404][ T231] do_syscall_64+0xc1/0xfd0 [ 15.684410][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 15.684414][ T231] RIP: 0033:0x4901eb [ 15.684419][ T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44 [ 15.684422][ T231] RSP: 002b:00007ffd40a35c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 15.684427][ T231] RAX: ffffffffffffffda RBX: 00007ffd40a361f0 RCX: 00000000004901eb [ 15.684431][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 15.684432][ T231] RBP: 00007ffd40a35cd0 R08: 0000000000000000 R09: 0000000000000000 [ 15.684434][ T231] R10: 0000000000010000 R11: 0000000000000293 R12: 00007ffd40a36168 [ 15.684438][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 15.684444][ T231] [ 15.684446][ T231] [ 15.691467][ T231] The buggy address belongs to the physical page: [ 15.691684][ T231] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88800a848a00 pfn:0xa848 [ 15.692048][ T231] flags: 0x80000000000000(node=0|zone=1) [ 15.692225][ T231] raw: 0080000000000000 0000000000000000 dead000000000122 0000000000000000 [ 15.692534][ T231] raw: ffff88800a848a00 0000000000000000 00000001ffffffff 0000000000000000 [ 15.692825][ T231] page dumped because: kasan: bad access detected [ 15.693059][ T231] [ 15.693144][ T231] Memory state around the buggy address: [ 15.693305][ T231] ffff88800a848580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 15.693555][ T231] ffff88800a848600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 15.693804][ T231] >ffff88800a848680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 15.694069][ T231] ^ [ 15.694194][ T231] ffff88800a848700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 15.694444][ T231] ffff88800a848780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 15.694688][ T231] ================================================================== [ 15.695017][ T231] Disabling lock debugging due to kernel taint [ 15.695250][ T231] ------------[ cut here ]------------ [ 15.695456][ T231] refcount_t: underflow; use-after-free. [ 15.695676][ T231] WARNING: CPU: 2 PID: 231 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0 [ 15.696024][ T231] Modules linked in: [ 15.696178][ T231] CPU: 2 UID: 0 PID: 231 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full) [ 15.696588][ T231] Tainted: [B]=BAD_PAGE [ 15.696736][ T231] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.696982][ T231] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0 [ 15.697236][ T231] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 05 99 e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff [ 15.697856][ T231] RSP: 0018:ffffc90000b97ce8 EFLAGS: 00010282 [ 15.698114][ T231] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 15.698388][ T231] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 15.698685][ T231] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff333e134 [ 15.699013][ T231] R10: 0000000000000003 R11: ffffc90000b97880 R12: 0000000000000001 [ 15.699295][ T231] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100 [ 15.699594][ T231] FS: 0000000001f503c0(0000) GS:ffff88809591a000(0000) knlGS:0000000000000000 [ 15.699934][ T231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 15.700183][ T231] CR2: 00007f6cccc10000 CR3: 000000000c69c002 CR4: 0000000000772ef0 [ 15.700482][ T231] PKRU: 55555554 [ 15.700649][ T231] Call Trace: [ 15.700798][ T231] [ 15.700915][ T231] netdev_run_todo+0x5f0/0xc60 [ 15.701118][ T231] ? rtnl_is_locked+0x15/0x20 [ 15.701305][ T231] ? netif_state_change+0x228/0x2c0 [ 15.701508][ T231] ? call_netdevice_notifiers_info+0x100/0x100 [ 15.701734][ T231] ? generic_xdp_install+0x410/0x410 [ 15.701935][ T231] ? tun_chr_close+0xae/0x1c0 [ 15.702133][ T231] tun_chr_close+0xc0/0x1c0 [ 15.702326][ T231] __fput+0x35c/0xa70 [ 15.702501][ T231] fput_close_sync+0xdd/0x1b0 [ 15.702695][ T231] ? alloc_file_clone+0xf0/0xf0 [ 15.702893][ T231] __x64_sys_close+0x7d/0xd0 [ 15.703104][ T231] do_syscall_64+0xc1/0xfd0 [ 15.703294][ T231] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 15.703531][ T231] RIP: 0033:0x4901eb [ 15.703684][ T231] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44 [ 15.704312][ T231] RSP: 002b:00007ffd40a35c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 15.704604][ T231] RAX: ffffffffffffffda RBX: 00007ffd40a361f0 RCX: 00000000004901eb [ 15.704875][ T231] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 15.705162][ T231] RBP: 00007ffd40a35cd0 R08: 0000000000000000 R09: 0000000000000000 [ 15.705463][ T231] R10: 0000000000010000 R11: 0000000000000293 R12: 00007ffd40a36168 [ 15.705737][ T231] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 15.706045][ T231] [ 15.706198][ T231] irq event stamp: 1488465 [ 15.706388][ T231] hardirqs last enabled at (1488465): [] irqentry_exit+0x3b/0x80 [ 15.706724][ T231] hardirqs last disabled at (1488464): [] common_interrupt+0x19/0xe0 [ 15.707047][ T231] softirqs last enabled at (1488282): [] __tun_set_ebpf+0xc6/0x180 [ 15.707358][ T231] softirqs last disabled at (1488280): [] __tun_set_ebpf+0x91/0x180 [ 15.707697][ T231] ---[ end trace 0000000000000000 ]---