[ 43.157731] audit: type=1800 audit(1575521396.996:32): pid=7604 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 48.055335] kauditd_printk_skb: 2 callbacks suppressed [ 48.055348] audit: type=1400 audit(1575521401.976:35): avc: denied { map } for pid=7775 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program [ 54.695615] audit: type=1400 audit(1575521408.616:36): avc: denied { map } for pid=7787 comm="syz-executor263" path="/root/syz-executor263782010" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 54.700643] BUG: unable to handle kernel NULL pointer dereference at 0000000000000002 [ 54.730029] PGD 7cb4b067 P4D 7cb4b067 PUD a0374067 PMD 0 [ 54.735564] Oops: 0002 [#1] PREEMPT SMP KASAN [ 54.740130] CPU: 1 PID: 7787 Comm: syz-executor263 Not tainted 4.19.87-syzkaller #0 [ 54.747989] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.757710] RIP: 0010:mem_serial_out+0x70/0x90 [ 54.762395] Code: e1 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5c 24 40 <44> 88 2b 5b 41 5c 41 5d 5d c3 e8 f1 74 f1 fd eb c0 e8 4a 75 f1 fd [ 54.781740] RSP: 0018:ffff8880750a7830 EFLAGS: 00010202 [ 54.787517] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 54.795225] RDX: 1ffffffff16d9da3 RSI: ffffffff83b12bd6 RDI: ffffffff8b6ced18 [ 54.802606] RBP: ffff8880750a7848 R08: ffff88807b12c580 R09: ffffed104326c1d6 [ 54.810208] R10: ffffed104326c1d5 R11: ffff888219360eab R12: ffffffff8b6cecd8 [ 54.817613] R13: 0000000000000001 R14: 0000000000000100 R15: 0000000000000002 [ 54.824876] FS: 0000000001e4c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 54.833276] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.839241] CR2: 0000000000000002 CR3: 00000000a89c1000 CR4: 00000000001406e0 [ 54.846513] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.853858] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.861394] Call Trace: [ 54.863978] serial8250_clear_fifos.part.0+0x3a/0xb0 [ 54.869069] serial8250_do_startup+0x47f/0x1fe0 [ 54.873726] ? lockdep_hardirqs_on+0x415/0x5d0 [ 54.878367] ? trace_hardirqs_on+0x67/0x220 [ 54.882714] serial8250_startup+0x62/0x80 [ 54.887008] uart_startup.part.0+0x491/0x980 [ 54.891441] ? uart_put_char+0x530/0x530 [ 54.895499] ? serial8250_request_std_resource+0x159/0x3d0 [ 54.901110] ? serial8250_probe+0x690/0x690 [ 54.905519] ? serial8250_request_port+0x16/0x20 [ 54.910281] uart_ioctl+0x15ec/0x2a60 [ 54.914096] ? uart_port_activate+0x230/0x230 [ 54.918582] ? __might_fault+0x12b/0x1e0 [ 54.922718] ? uart_port_activate+0x230/0x230 [ 54.928012] tty_ioctl+0x7f3/0x1510 [ 54.931655] ? tty_vhangup+0x30/0x30 [ 54.935371] ? find_held_lock+0x35/0x130 [ 54.939466] ? debug_check_no_obj_freed+0x200/0x464 [ 54.944509] ? __might_sleep+0x95/0x190 [ 54.948475] ? trace_hardirqs_off+0x62/0x220 [ 54.952892] ? tty_vhangup+0x30/0x30 [ 54.956706] do_vfs_ioctl+0xd5f/0x1380 [ 54.960584] ? selinux_file_ioctl+0x46f/0x5e0 [ 54.965151] ? selinux_file_ioctl+0x125/0x5e0 [ 54.969629] ? ioctl_preallocate+0x210/0x210 [ 54.974019] ? selinux_file_mprotect+0x620/0x620 [ 54.978759] ? kmem_cache_free+0x222/0x260 [ 54.983000] ? do_sys_open+0x31d/0x550 [ 54.986883] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.992420] ? security_file_ioctl+0x8d/0xc0 [ 54.996834] ksys_ioctl+0xab/0xd0 [ 55.000283] __x64_sys_ioctl+0x73/0xb0 [ 55.004170] do_syscall_64+0xfd/0x620 [ 55.008140] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.013334] RIP: 0033:0x440219 [ 55.016513] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.035582] RSP: 002b:00007fff3136e9c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 55.043284] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 55.050537] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 55.057877] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 55.065137] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 55.072388] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 55.079822] Modules linked in: [ 55.082997] CR2: 0000000000000002 [ 55.086642] ---[ end trace 2ca242cf566f2942 ]--- [ 55.091429] RIP: 0010:mem_serial_out+0x70/0x90 [ 55.096302] Code: e1 00 00 00 49 8d 7c 24 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5c 24 40 <44> 88 2b 5b 41 5c 41 5d 5d c3 e8 f1 74 f1 fd eb c0 e8 4a 75 f1 fd [ 55.115289] RSP: 0018:ffff8880750a7830 EFLAGS: 00010202 [ 55.120664] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 55.128038] RDX: 1ffffffff16d9da3 RSI: ffffffff83b12bd6 RDI: ffffffff8b6ced18 [ 55.135374] RBP: ffff8880750a7848 R08: ffff88807b12c580 R09: ffffed104326c1d6 [ 55.142658] R10: ffffed104326c1d5 R11: ffff888219360eab R12: ffffffff8b6cecd8 [ 55.149978] R13: 0000000000000001 R14: 0000000000000100 R15: 0000000000000002 [ 55.157305] FS: 0000000001e4c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 55.165621] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.171539] CR2: 0000000000000002 CR3: 00000000a89c1000 CR4: 00000000001406e0 [ 55.178881] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.186317] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.193583] Kernel panic - not syncing: Fatal exception [ 55.200318] Kernel Offset: disabled [ 55.203948] Rebooting in 86400 seconds..