Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.109' (ECDSA) to the list of known hosts. 2021/05/01 17:59:35 fuzzer started 2021/05/01 17:59:35 dialing manager at 10.128.0.169:44661 2021/05/01 17:59:35 syscalls: 3571 2021/05/01 17:59:35 code coverage: enabled 2021/05/01 17:59:35 comparison tracing: enabled 2021/05/01 17:59:35 extra coverage: enabled 2021/05/01 17:59:35 setuid sandbox: enabled 2021/05/01 17:59:35 namespace sandbox: enabled 2021/05/01 17:59:35 Android sandbox: /sys/fs/selinux/policy does not exist 2021/05/01 17:59:35 fault injection: enabled 2021/05/01 17:59:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/01 17:59:35 net packet injection: enabled 2021/05/01 17:59:35 net device setup: enabled 2021/05/01 17:59:35 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2021/05/01 17:59:35 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/01 17:59:35 USB emulation: enabled 2021/05/01 17:59:35 hci packet injection: enabled 2021/05/01 17:59:35 wifi device emulation: enabled 2021/05/01 17:59:35 802.15.4 emulation: enabled 2021/05/01 17:59:35 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/01 17:59:35 fetching corpus: 50, signal 49504/53262 (executing program) 2021/05/01 17:59:36 fetching corpus: 100, signal 86936/92300 (executing program) 2021/05/01 17:59:36 fetching corpus: 150, signal 109185/116093 (executing program) 2021/05/01 17:59:36 fetching corpus: 200, signal 130125/138499 (executing program) 2021/05/01 17:59:36 fetching corpus: 250, signal 148738/158547 (executing program) 2021/05/01 17:59:36 fetching corpus: 300, signal 159737/170925 (executing program) syzkaller login: [ 69.373656][ T8446] ================================================================== [ 69.381888][ T8446] BUG: KASAN: use-after-free in __skb_datagram_iter+0x6b8/0x770 [ 69.389594][ T8446] Read of size 4 at addr ffff88802bab0004 by task syz-fuzzer/8446 [ 69.397386][ T8446] [ 69.399697][ T8446] CPU: 1 PID: 8446 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 [ 69.409235][ T8446] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.419293][ T8446] Call Trace: [ 69.422581][ T8446] dump_stack+0x141/0x1d7 [ 69.426940][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.432211][ T8446] print_address_description.constprop.0.cold+0x5b/0x2f8 [ 69.439235][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.444528][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.449827][ T8446] kasan_report.cold+0x7c/0xd8 [ 69.454605][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.459910][ T8446] __skb_datagram_iter+0x6b8/0x770 [ 69.465043][ T8446] ? zerocopy_sg_from_iter+0x110/0x110 [ 69.470515][ T8446] skb_copy_datagram_iter+0x40/0x50 [ 69.475722][ T8446] tcp_recvmsg_locked+0x1048/0x22f0 [ 69.480949][ T8446] ? tcp_splice_read+0x8b0/0x8b0 [ 69.485896][ T8446] ? mark_held_locks+0x9f/0xe0 [ 69.490676][ T8446] ? __local_bh_enable_ip+0xa0/0x120 [ 69.495973][ T8446] tcp_recvmsg+0x134/0x550 [ 69.500408][ T8446] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 69.505801][ T8446] ? aa_sk_perm+0x311/0xab0 [ 69.510320][ T8446] inet_recvmsg+0x11b/0x5e0 [ 69.514837][ T8446] ? inet_sendpage+0x140/0x140 [ 69.519616][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.525867][ T8446] ? security_socket_recvmsg+0x8f/0xc0 [ 69.531338][ T8446] sock_read_iter+0x33c/0x470 [ 69.536028][ T8446] ? ____sys_recvmsg+0x600/0x600 [ 69.540986][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.547242][ T8446] ? fsnotify+0xa58/0x1060 [ 69.551673][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.557932][ T8446] new_sync_read+0x5b7/0x6e0 [ 69.562532][ T8446] ? ksys_lseek+0x1b0/0x1b0 [ 69.567041][ T8446] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 69.573073][ T8446] vfs_read+0x35c/0x570 [ 69.577239][ T8446] ksys_read+0x1ee/0x250 [ 69.581488][ T8446] ? vfs_write+0xa40/0xa40 [ 69.585918][ T8446] ? syscall_enter_from_user_mode+0x27/0x70 [ 69.591842][ T8446] do_syscall_64+0x3a/0xb0 [ 69.596279][ T8446] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 69.602185][ T8446] RIP: 0033:0x4af19b [ 69.606083][ T8446] 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 [ 69.625698][ T8446] RSP: 002b:000000c0002fd828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 69.634119][ T8446] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 69.642268][ T8446] RDX: 0000000000001000 RSI: 000000c000198000 RDI: 0000000000000006 [ 69.650265][ T8446] RBP: 000000c0002fd878 R08: 0000000000000001 R09: 0000000000000002 [ 69.658239][ T8446] R10: 0000000000004950 R11: 0000000000000212 R12: ffffffffffffffff [ 69.666212][ T8446] R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002 [ 69.674206][ T8446] [ 69.676526][ T8446] The buggy address belongs to the page: [ 69.682147][ T8446] page:ffffea0000aeac00 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x0 pfn:0x2bab0 [ 69.692560][ T8446] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) [ 69.699687][ T8446] raw: 00fff00000000000 ffffea00005a0e08 ffff88813fffb978 0000000000000000 [ 69.708290][ T8446] raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000 [ 69.716867][ T8446] page dumped because: kasan: bad access detected [ 69.723273][ T8446] [ 69.725594][ T8446] Memory state around the buggy address: [ 69.731216][ T8446] ffff88802baaff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 69.739275][ T8446] ffff88802baaff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 69.747337][ T8446] >ffff88802bab0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 69.755405][ T8446] ^ [ 69.759469][ T8446] ffff88802bab0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 69.767544][ T8446] ffff88802bab0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 69.775599][ T8446] ================================================================== [ 69.783649][ T8446] Disabling lock debugging due to kernel taint [ 69.792066][ T8446] Kernel panic - not syncing: panic_on_warn set ... [ 69.798662][ T8446] CPU: 0 PID: 8446 Comm: syz-fuzzer Tainted: G B 5.12.0-rc8-next-20210423-syzkaller #0 [ 69.809624][ T8446] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.819714][ T8446] Call Trace: [ 69.822997][ T8446] dump_stack+0x141/0x1d7 [ 69.827329][ T8446] panic+0x306/0x73d [ 69.831320][ T8446] ? __warn_printk+0xf3/0xf3 [ 69.835903][ T8446] ? preempt_schedule_common+0x59/0xc0 [ 69.841347][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.846617][ T8446] ? preempt_schedule_thunk+0x16/0x18 [ 69.851973][ T8446] ? trace_hardirqs_on+0x38/0x1c0 [ 69.856977][ T8446] ? trace_hardirqs_on+0x51/0x1c0 [ 69.861995][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.867263][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.872560][ T8446] end_report.cold+0x5a/0x5a [ 69.877148][ T8446] kasan_report.cold+0x6a/0xd8 [ 69.881905][ T8446] ? __skb_datagram_iter+0x6b8/0x770 [ 69.887182][ T8446] __skb_datagram_iter+0x6b8/0x770 [ 69.892293][ T8446] ? zerocopy_sg_from_iter+0x110/0x110 [ 69.897746][ T8446] skb_copy_datagram_iter+0x40/0x50 [ 69.902952][ T8446] tcp_recvmsg_locked+0x1048/0x22f0 [ 69.908247][ T8446] ? tcp_splice_read+0x8b0/0x8b0 [ 69.913184][ T8446] ? mark_held_locks+0x9f/0xe0 [ 69.918108][ T8446] ? __local_bh_enable_ip+0xa0/0x120 [ 69.923394][ T8446] tcp_recvmsg+0x134/0x550 [ 69.927817][ T8446] ? tcp_recvmsg_locked+0x22f0/0x22f0 [ 69.933183][ T8446] ? aa_sk_perm+0x311/0xab0 [ 69.937675][ T8446] inet_recvmsg+0x11b/0x5e0 [ 69.942169][ T8446] ? inet_sendpage+0x140/0x140 [ 69.946931][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.953163][ T8446] ? security_socket_recvmsg+0x8f/0xc0 [ 69.958616][ T8446] sock_read_iter+0x33c/0x470 [ 69.963282][ T8446] ? ____sys_recvmsg+0x600/0x600 [ 69.968203][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.974443][ T8446] ? fsnotify+0xa58/0x1060 [ 69.978853][ T8446] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 69.985223][ T8446] new_sync_read+0x5b7/0x6e0 [ 69.989801][ T8446] ? ksys_lseek+0x1b0/0x1b0 [ 69.994291][ T8446] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 70.000280][ T8446] vfs_read+0x35c/0x570 [ 70.004437][ T8446] ksys_read+0x1ee/0x250 [ 70.008763][ T8446] ? vfs_write+0xa40/0xa40 [ 70.013161][ T8446] ? syscall_enter_from_user_mode+0x27/0x70 [ 70.019038][ T8446] do_syscall_64+0x3a/0xb0 [ 70.023442][ T8446] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 70.029320][ T8446] RIP: 0033:0x4af19b [ 70.033196][ T8446] 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 [ 70.052786][ T8446] RSP: 002b:000000c0002fd828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 70.061181][ T8446] RAX: ffffffffffffffda RBX: 000000c00001e800 RCX: 00000000004af19b [ 70.069133][ T8446] RDX: 0000000000001000 RSI: 000000c000198000 RDI: 0000000000000006 [ 70.077085][ T8446] RBP: 000000c0002fd878 R08: 0000000000000001 R09: 0000000000000002 [ 70.085054][ T8446] R10: 0000000000004950 R11: 0000000000000212 R12: ffffffffffffffff [ 70.093004][ T8446] R13: 0000000000002000 R14: 0000000000000002 R15: 0000000000000002 [ 70.101513][ T8446] Kernel Offset: disabled [ 70.105849][ T8446] Rebooting in 86400 seconds..