Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts. 2021/05/02 05:23:16 fuzzer started 2021/05/02 05:23:17 dialing manager at 10.128.0.169:44661 2021/05/02 05:23:17 syscalls: 3571 2021/05/02 05:23:17 code coverage: enabled 2021/05/02 05:23:17 comparison tracing: enabled 2021/05/02 05:23:17 extra coverage: enabled 2021/05/02 05:23:17 setuid sandbox: enabled 2021/05/02 05:23:17 namespace sandbox: enabled 2021/05/02 05:23:17 Android sandbox: /sys/fs/selinux/policy does not exist 2021/05/02 05:23:17 fault injection: enabled 2021/05/02 05:23:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/02 05:23:17 net packet injection: enabled 2021/05/02 05:23:17 net device setup: enabled 2021/05/02 05:23:17 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2021/05/02 05:23:17 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/02 05:23:17 USB emulation: enabled 2021/05/02 05:23:17 hci packet injection: enabled 2021/05/02 05:23:17 wifi device emulation: enabled 2021/05/02 05:23:17 802.15.4 emulation: enabled 2021/05/02 05:23:17 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/02 05:23:17 fetching corpus: 50, signal 42605/46364 (executing program) syzkaller login: [ 73.329648][ T8464] ================================================================== [ 73.337892][ T8464] BUG: KASAN: use-after-free in __skb_datagram_iter+0x6b8/0x770 [ 73.345542][ T8464] Read of size 4 at addr ffff888028d80004 by task syz-fuzzer/8464 [ 73.354295][ T8464] [ 73.356622][ T8464] CPU: 1 PID: 8464 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 [ 73.366165][ T8464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.376223][ T8464] Call Trace: [ 73.379498][ T8464] dump_stack+0x141/0x1d7 [ 73.383853][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.389830][ T8464] print_address_description.constprop.0.cold+0x5b/0x2f8 [ 73.396861][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.402224][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.407504][ T8464] kasan_report.cold+0x7c/0xd8 [ 73.412374][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.417688][ T8464] __skb_datagram_iter+0x6b8/0x770 [ 73.422837][ T8464] ? zerocopy_sg_from_iter+0x110/0x110 [ 73.428329][ T8464] skb_copy_datagram_iter+0x40/0x50 [ 73.433539][ T8464] tcp_recvmsg_locked+0x1048/0x22f0 [ 73.438773][ T8464] ? tcp_splice_read+0x8b0/0x8b0 [ 73.443745][ T8464] ? mark_held_locks+0x9f/0xe0 [ 73.448527][ T8464] ? __local_bh_enable_ip+0xa0/0x120 [ 73.453827][ T8464] tcp_recvmsg+0x134/0x550 [ 73.458262][ T8464] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 73.469389][ T8464] ? aa_sk_perm+0x311/0xab0 [ 73.473917][ T8464] inet_recvmsg+0x11b/0x5e0 [ 73.478464][ T8464] ? inet_sendpage+0x140/0x140 [ 73.483250][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.489504][ T8464] ? security_socket_recvmsg+0x8f/0xc0 [ 73.494978][ T8464] sock_read_iter+0x33c/0x470 [ 73.499667][ T8464] ? ____sys_recvmsg+0x600/0x600 [ 73.504660][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.510916][ T8464] ? fsnotify+0xa58/0x1060 [ 73.515342][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.521606][ T8464] new_sync_read+0x5b7/0x6e0 [ 73.526210][ T8464] ? ksys_lseek+0x1b0/0x1b0 [ 73.530745][ T8464] vfs_read+0x35c/0x570 [ 73.534912][ T8464] ksys_read+0x1ee/0x250 [ 73.539164][ T8464] ? vfs_write+0xa40/0xa40 [ 73.543594][ T8464] ? syscall_enter_from_user_mode+0x27/0x70 [ 73.549518][ T8464] do_syscall_64+0x3a/0xb0 [ 73.553946][ T8464] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.560998][ T8464] RIP: 0033:0x4af19b [ 73.564902][ T8464] 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 [ 73.584519][ T8464] RSP: 002b:000000c00047b828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 73.592979][ T8464] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 73.600966][ T8464] RDX: 0000000000001000 RSI: 000000c000397000 RDI: 0000000000000006 [ 73.608947][ T8464] RBP: 000000c00047b878 R08: 0000000000000001 R09: 0000000000000002 [ 73.616927][ T8464] R10: 00000000000073c4 R11: 0000000000000212 R12: 00000000000073be [ 73.624924][ T8464] R13: 0000000000002000 R14: 0000000000000004 R15: 0000000000000004 [ 73.632926][ T8464] [ 73.635250][ T8464] The buggy address belongs to the page: [ 73.640877][ T8464] page:ffffea0000a36000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28d80 [ 73.651035][ T8464] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 73.658176][ T8464] raw: 00fff00000000000 ffffea0000a42c88 ffffea0000577648 0000000000000000 [ 73.666780][ T8464] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 73.675365][ T8464] page dumped because: kasan: bad access detected [ 73.681777][ T8464] [ 73.684098][ T8464] Memory state around the buggy address: [ 73.689728][ T8464] ffff888028d7ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 73.697796][ T8464] ffff888028d7ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 73.705864][ T8464] >ffff888028d80000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 73.713932][ T8464] ^ [ 73.717998][ T8464] ffff888028d80080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 73.726081][ T8464] ffff888028d80100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 73.734139][ T8464] ================================================================== [ 73.742191][ T8464] Disabling lock debugging due to kernel taint [ 73.750636][ T8464] Kernel panic - not syncing: panic_on_warn set ... [ 73.757234][ T8464] CPU: 0 PID: 8464 Comm: syz-fuzzer Tainted: G B 5.12.0-rc8-next-20210423-syzkaller #0 [ 73.768266][ T8464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.778381][ T8464] Call Trace: [ 73.781656][ T8464] dump_stack+0x141/0x1d7 [ 73.785999][ T8464] panic+0x306/0x73d [ 73.789885][ T8464] ? __warn_printk+0xf3/0xf3 [ 73.794460][ T8464] ? preempt_schedule_common+0x59/0xc0 [ 73.799930][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.805207][ T8464] ? preempt_schedule_thunk+0x16/0x18 [ 73.810631][ T8464] ? trace_hardirqs_on+0x38/0x1c0 [ 73.815760][ T8464] ? trace_hardirqs_on+0x51/0x1c0 [ 73.820808][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.826084][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.831372][ T8464] end_report.cold+0x5a/0x5a [ 73.836015][ T8464] kasan_report.cold+0x6a/0xd8 [ 73.840801][ T8464] ? __skb_datagram_iter+0x6b8/0x770 [ 73.846077][ T8464] __skb_datagram_iter+0x6b8/0x770 [ 73.851177][ T8464] ? zerocopy_sg_from_iter+0x110/0x110 [ 73.856630][ T8464] skb_copy_datagram_iter+0x40/0x50 [ 73.861815][ T8464] tcp_recvmsg_locked+0x1048/0x22f0 [ 73.867547][ T8464] ? tcp_splice_read+0x8b0/0x8b0 [ 73.872472][ T8464] ? mark_held_locks+0x9f/0xe0 [ 73.877247][ T8464] ? __local_bh_enable_ip+0xa0/0x120 [ 73.882538][ T8464] tcp_recvmsg+0x134/0x550 [ 73.886974][ T8464] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 73.892361][ T8464] ? aa_sk_perm+0x311/0xab0 [ 73.896871][ T8464] inet_recvmsg+0x11b/0x5e0 [ 73.901386][ T8464] ? inet_sendpage+0x140/0x140 [ 73.906155][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.912477][ T8464] ? security_socket_recvmsg+0x8f/0xc0 [ 73.917929][ T8464] sock_read_iter+0x33c/0x470 [ 73.922606][ T8464] ? ____sys_recvmsg+0x600/0x600 [ 73.927536][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.933769][ T8464] ? fsnotify+0xa58/0x1060 [ 73.938176][ T8464] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 73.944422][ T8464] new_sync_read+0x5b7/0x6e0 [ 73.948997][ T8464] ? ksys_lseek+0x1b0/0x1b0 [ 73.953487][ T8464] vfs_read+0x35c/0x570 [ 73.957642][ T8464] ksys_read+0x1ee/0x250 [ 73.961881][ T8464] ? vfs_write+0xa40/0xa40 [ 73.966282][ T8464] ? syscall_enter_from_user_mode+0x27/0x70 [ 73.972176][ T8464] do_syscall_64+0x3a/0xb0 [ 73.976580][ T8464] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 73.982478][ T8464] RIP: 0033:0x4af19b [ 73.986356][ T8464] 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 [ 74.005948][ T8464] RSP: 002b:000000c00047b828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 74.014350][ T8464] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 74.022321][ T8464] RDX: 0000000000001000 RSI: 000000c000397000 RDI: 0000000000000006 [ 74.030293][ T8464] RBP: 000000c00047b878 R08: 0000000000000001 R09: 0000000000000002 [ 74.038251][ T8464] R10: 00000000000073c4 R11: 0000000000000212 R12: 00000000000073be [ 74.046206][ T8464] R13: 0000000000002000 R14: 0000000000000004 R15: 0000000000000004 [ 74.054241][ T8464] Kernel Offset: disabled [ 74.058555][ T8464] Rebooting in 86400 seconds..