flags: 0x2fffc0000000000() raw: 02fffc0000000000 dead000000000100 dead000000000200 0000000000000000 raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:519! invalid opcode: 0000 [#1] PREEMPT SMP KASAN kobject: 'loop1' (0000000028aa06c3): kobject_uevent_env CPU: 1 PID: 11867 Comm: syz-executor5 Not tainted 4.19.0-rc4+ #114 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop1' (0000000028aa06c3): fill_kobj_path: path = '/devices/virtual/block/loop1' RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline] RIP: 0010:put_page include/linux/mm.h:942 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2768 [inline] RIP: 0010:skb_release_data+0x6bd/0x880 net/core/skbuff.c:564 Code: e8 58 a1 70 fb 48 8b bd 10 ff ff ff e8 ec ca fe ff e9 16 fb ff ff e8 42 a1 70 fb 48 c7 c6 80 a8 a5 88 4c 89 ef e8 f3 48 a2 fb <0f> 0b e8 2c a1 70 fb 4c 8d 6b ff e9 b0 fc ff ff e8 1e a1 70 fb 4c RSP: 0018:ffff88019f757538 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea000692b034 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81b08e19 RDI: ffffed0033eeae98 RBP: ffff88019f757658 R08: ffff8801d919e200 R09: ffffed003b5e4fe8 R10: ffffed003b5e4fe8 R11: ffff8801daf27f47 R12: dffffc0000000000 R13: ffffea000692b000 R14: ffff8801c5d307e0 R15: 0000000000000003 FS: 00000000011f7940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd6bdc5d0c CR3: 00000001bca67000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb+0x15/0x20 net/core/skbuff.c:641 sk_wmem_free_skb include/net/sock.h:1447 [inline] tcp_write_queue_purge+0x2b6/0x8b0 net/ipv4/tcp.c:2520 tcp_disconnect+0x4a7/0x16e0 net/ipv4/tcp.c:2559 tcp_close+0x1047/0x1300 net/ipv4/tcp.c:2356 tls_sk_proto_close+0x7a4/0xbb0 net/tls/tls_main.c:313 inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428 inet6_release+0x50/0x70 net/ipv6/af_inet6.c:457 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1141 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411151 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffccdd21730 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000411151 RDX: 0000001b31e20000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 00007ffccdd21660 R11: 0000000000000293 R12: 0000000000000008 R13: 000000000002d6f4 R14: 00000000000000b8 R15: badc0ffeebadface Modules linked in: ================================================================== kobject: 'loop4' (00000000acfa5074): kobject_uevent_env BUG: KASAN: use-after-free in schedule_debug kernel/sched/core.c:3285 [inline] BUG: KASAN: use-after-free in __schedule+0x1a18/0x1ed0 kernel/sched/core.c:3395 kobject: 'loop4' (00000000acfa5074): fill_kobj_path: path = '/devices/virtual/block/loop4' Read of size 8 at addr ffff8801a4698000 by task syz-executor3/11890 CPU: 1 PID: 11890 Comm: syz-executor3 Tainted: G D 4.19.0-rc4+ #114 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ---[ end trace bcf93bc9772f17bb ]--- Call Trace: RIP: 0010:put_page_testzero include/linux/mm.h:519 [inline] RIP: 0010:put_page include/linux/mm.h:942 [inline] RIP: 0010:__skb_frag_unref include/linux/skbuff.h:2768 [inline] RIP: 0010:skb_release_data+0x6bd/0x880 net/core/skbuff.c:564 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 Code: e8 58 a1 70 fb 48 8b bd 10 ff ff ff e8 ec ca fe ff e9 16 fb ff ff e8 42 a1 70 fb 48 c7 c6 80 a8 a5 88 4c 89 ef e8 f3 48 a2 fb <0f> 0b e8 2c a1 70 fb 4c 8d 6b ff e9 b0 fc ff ff e8 1e a1 70 fb 4c kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 schedule_debug kernel/sched/core.c:3285 [inline] __schedule+0x1a18/0x1ed0 kernel/sched/core.c:3395 RSP: 0018:ffff88019f757538 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffea000692b034 RCX: 0000000000000000 schedule+0xfe/0x460 kernel/sched/core.c:3517 RDX: 0000000000000000 RSI: ffffffff81b08e19 RDI: ffffed0033eeae98 RBP: ffff88019f757658 R08: ffff8801d919e200 R09: ffffed003b5e4fe8 freezable_schedule include/linux/freezer.h:172 [inline] futex_wait_queue_me+0x3f9/0x840 kernel/futex.c:2530 R10: ffffed003b5e4fe8 R11: ffff8801daf27f47 R12: dffffc0000000000 R13: ffffea000692b000 R14: ffff8801c5d307e0 R15: 0000000000000003 FS: 00000000011f7940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 futex_wait+0x45c/0xa50 kernel/futex.c:2645 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 00000001bca67000 CR4: 00000000001406f0 do_futex+0x31a/0x26d0 kernel/futex.c:3528 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400