Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts. 2021/05/04 04:20:54 fuzzer started 2021/05/04 04:20:54 dialing manager at 10.128.0.169:34381 2021/05/04 04:20:54 syscalls: 3586 2021/05/04 04:20:54 code coverage: enabled 2021/05/04 04:20:54 comparison tracing: enabled 2021/05/04 04:20:54 extra coverage: enabled 2021/05/04 04:20:54 setuid sandbox: enabled 2021/05/04 04:20:54 namespace sandbox: enabled 2021/05/04 04:20:54 Android sandbox: /sys/fs/selinux/policy does not exist 2021/05/04 04:20:54 fault injection: enabled 2021/05/04 04:20:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/04 04:20:54 net packet injection: enabled 2021/05/04 04:20:54 net device setup: enabled 2021/05/04 04:20:54 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2021/05/04 04:20:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/04 04:20:54 USB emulation: enabled 2021/05/04 04:20:54 hci packet injection: enabled 2021/05/04 04:20:54 wifi device emulation: enabled 2021/05/04 04:20:54 802.15.4 emulation: enabled 2021/05/04 04:20:54 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/04 04:20:54 fetching corpus: 50, signal 40798/44539 (executing program) 2021/05/04 04:20:54 fetching corpus: 100, signal 78928/84158 (executing program) 2021/05/04 04:20:55 fetching corpus: 150, signal 98923/105680 (executing program) 2021/05/04 04:20:55 fetching corpus: 199, signal 115775/123973 (executing program) syzkaller login: [ 75.228003][ T8450] ================================================================== [ 75.236325][ T8450] BUG: KASAN: use-after-free in __skb_datagram_iter+0x6b8/0x770 [ 75.244929][ T8450] Read of size 4 at addr ffff88802e800004 by task syz-fuzzer/8450 [ 75.252838][ T8450] [ 75.255150][ T8450] CPU: 1 PID: 8450 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 [ 75.264721][ T8450] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.274773][ T8450] Call Trace: [ 75.278061][ T8450] dump_stack+0x141/0x1d7 [ 75.282410][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.288483][ T8450] print_address_description.constprop.0.cold+0x5b/0x2f8 [ 75.295604][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.300882][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.306173][ T8450] kasan_report.cold+0x7c/0xd8 [ 75.310938][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.316229][ T8450] __skb_datagram_iter+0x6b8/0x770 [ 75.321361][ T8450] ? zerocopy_sg_from_iter+0x110/0x110 [ 75.327692][ T8450] skb_copy_datagram_iter+0x40/0x50 [ 75.332888][ T8450] tcp_recvmsg_locked+0x1048/0x22f0 [ 75.338097][ T8450] ? tcp_splice_read+0x8b0/0x8b0 [ 75.343081][ T8450] ? mark_held_locks+0x9f/0xe0 [ 75.347855][ T8450] ? __local_bh_enable_ip+0xa0/0x120 [ 75.353315][ T8450] tcp_recvmsg+0x134/0x550 [ 75.357730][ T8450] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 75.363141][ T8450] ? aa_sk_perm+0x311/0xab0 [ 75.367658][ T8450] inet_recvmsg+0x11b/0x5e0 [ 75.372178][ T8450] ? inet_sendpage+0x140/0x140 [ 75.376956][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.383197][ T8450] ? security_socket_recvmsg+0x8f/0xc0 [ 75.388654][ T8450] sock_read_iter+0x33c/0x470 [ 75.393333][ T8450] ? ____sys_recvmsg+0x600/0x600 [ 75.398277][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.404532][ T8450] ? fsnotify+0xa58/0x1060 [ 75.408945][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.415210][ T8450] new_sync_read+0x5b7/0x6e0 [ 75.419797][ T8450] ? ksys_lseek+0x1b0/0x1b0 [ 75.424296][ T8450] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 75.430288][ T8450] vfs_read+0x35c/0x570 [ 75.434440][ T8450] ksys_read+0x1ee/0x250 [ 75.438673][ T8450] ? vfs_write+0xa40/0xa40 [ 75.443088][ T8450] ? syscall_enter_from_user_mode+0x27/0x70 [ 75.448984][ T8450] do_syscall_64+0x3a/0xb0 [ 75.453396][ T8450] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 75.459374][ T8450] RIP: 0033:0x4af19b [ 75.463264][ T8450] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 75.482948][ T8450] RSP: 002b:000000c000639828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 75.491367][ T8450] RAX: ffffffffffffffda RBX: 000000c00001c000 RCX: 00000000004af19b [ 75.499940][ T8450] RDX: 0000000000001000 RSI: 000000c00038d000 RDI: 0000000000000006 [ 75.507904][ T8450] RBP: 000000c000639878 R08: 0000000000000001 R09: 0000000000000002 [ 75.515868][ T8450] R10: 00000000000076aa R11: 0000000000000212 R12: 00000000000076a6 [ 75.523831][ T8450] R13: 0000000000000400 R14: 0000000000000004 R15: 0000000000000002 [ 75.531807][ T8450] [ 75.534120][ T8450] The buggy address belongs to the page: [ 75.539734][ T8450] page:ffffea0000ba0000 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x2e800 [ 75.550137][ T8450] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 75.557268][ T8450] raw: 00fff00000000000 ffffea0000538c08 ffff88813fffb9e0 0000000000000000 [ 75.565844][ T8450] raw: 0000000000000000 0000000000000004 00000000ffffff7f 0000000000000000 [ 75.574411][ T8450] page dumped because: kasan: bad access detected [ 75.580807][ T8450] [ 75.583117][ T8450] Memory state around the buggy address: [ 75.588739][ T8450] ffff88802e7fff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 75.596799][ T8450] ffff88802e7fff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 75.604851][ T8450] >ffff88802e800000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 75.612897][ T8450] ^ [ 75.616947][ T8450] ffff88802e800080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 75.625019][ T8450] ffff88802e800100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 75.633064][ T8450] ================================================================== [ 75.641119][ T8450] Disabling lock debugging due to kernel taint [ 75.649338][ T8450] Kernel panic - not syncing: panic_on_warn set ... [ 75.655951][ T8450] CPU: 1 PID: 8450 Comm: syz-fuzzer Tainted: G B 5.12.0-rc8-next-20210423-syzkaller #0 [ 75.667315][ T8450] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.677359][ T8450] Call Trace: [ 75.680629][ T8450] dump_stack+0x141/0x1d7 [ 75.684975][ T8450] panic+0x306/0x73d [ 75.689036][ T8450] ? __warn_printk+0xf3/0xf3 [ 75.693617][ T8450] ? preempt_schedule_common+0x59/0xc0 [ 75.699073][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.704351][ T8450] ? preempt_schedule_thunk+0x16/0x18 [ 75.709726][ T8450] ? trace_hardirqs_on+0x38/0x1c0 [ 75.714741][ T8450] ? trace_hardirqs_on+0x51/0x1c0 [ 75.719755][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.725027][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.730301][ T8450] end_report.cold+0x5a/0x5a [ 75.734888][ T8450] kasan_report.cold+0x6a/0xd8 [ 75.739646][ T8450] ? __skb_datagram_iter+0x6b8/0x770 [ 75.744936][ T8450] __skb_datagram_iter+0x6b8/0x770 [ 75.750038][ T8450] ? zerocopy_sg_from_iter+0x110/0x110 [ 75.755574][ T8450] skb_copy_datagram_iter+0x40/0x50 [ 75.760787][ T8450] tcp_recvmsg_locked+0x1048/0x22f0 [ 75.766009][ T8450] ? tcp_splice_read+0x8b0/0x8b0 [ 75.770947][ T8450] ? mark_held_locks+0x9f/0xe0 [ 75.775706][ T8450] ? __local_bh_enable_ip+0xa0/0x120 [ 75.780981][ T8450] tcp_recvmsg+0x134/0x550 [ 75.785403][ T8450] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 75.790791][ T8450] ? aa_sk_perm+0x311/0xab0 [ 75.795284][ T8450] inet_recvmsg+0x11b/0x5e0 [ 75.799790][ T8450] ? inet_sendpage+0x140/0x140 [ 75.804547][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.810955][ T8450] ? security_socket_recvmsg+0x8f/0xc0 [ 75.816416][ T8450] sock_read_iter+0x33c/0x470 [ 75.821089][ T8450] ? ____sys_recvmsg+0x600/0x600 [ 75.826045][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.832280][ T8450] ? fsnotify+0xa58/0x1060 [ 75.836687][ T8450] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 75.842934][ T8450] new_sync_read+0x5b7/0x6e0 [ 75.847601][ T8450] ? ksys_lseek+0x1b0/0x1b0 [ 75.852094][ T8450] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 75.858085][ T8450] vfs_read+0x35c/0x570 [ 75.863188][ T8450] ksys_read+0x1ee/0x250 [ 75.867433][ T8450] ? vfs_write+0xa40/0xa40 [ 75.871841][ T8450] ? syscall_enter_from_user_mode+0x27/0x70 [ 75.877728][ T8450] do_syscall_64+0x3a/0xb0 [ 75.882135][ T8450] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 75.888034][ T8450] RIP: 0033:0x4af19b [ 75.891929][ T8450] Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 75.911982][ T8450] RSP: 002b:000000c000639828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 75.920475][ T8450] RAX: ffffffffffffffda RBX: 000000c00001c000 RCX: 00000000004af19b [ 75.928455][ T8450] RDX: 0000000000001000 RSI: 000000c00038d000 RDI: 0000000000000006 [ 75.936417][ T8450] RBP: 000000c000639878 R08: 0000000000000001 R09: 0000000000000002 [ 75.944487][ T8450] R10: 00000000000076aa R11: 0000000000000212 R12: 00000000000076a6 [ 75.952450][ T8450] R13: 0000000000000400 R14: 0000000000000004 R15: 0000000000000002 [ 75.961031][ T8450] Kernel Offset: disabled [ 75.966198][ T8450] Rebooting in 86400 seconds..