Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.194' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.637887] audit: type=1400 audit(1602150728.581:8): avc: denied { execmem } for pid=6478 comm="syz-executor499" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 40.653548] MINIX-fs: mounting unchecked file system, running fsck is recommended [ 40.685371] ------------[ cut here ]------------ [ 40.690572] WARNING: CPU: 0 PID: 6478 at fs/inode.c:286 drop_nlink.cold+0x11/0x41 [ 40.698192] Kernel panic - not syncing: panic_on_warn set ... [ 40.698192] [ 40.705558] CPU: 0 PID: 6478 Comm: syz-executor499 Not tainted 4.19.150-syzkaller #0 [ 40.713442] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.722887] Call Trace: [ 40.725452] dump_stack+0x22c/0x33e [ 40.729072] panic+0x2ac/0x565 [ 40.732248] ? __warn_printk+0xf3/0xf3 [ 40.736113] ? drop_nlink.cold+0x11/0x41 [ 40.740165] ? __probe_kernel_read+0x130/0x1b0 [ 40.744860] ? __warn.cold+0x5/0x5a [ 40.748495] ? __warn+0xe4/0x200 [ 40.751841] ? drop_nlink.cold+0x11/0x41 [ 40.755881] __warn.cold+0x20/0x5a [ 40.759401] ? drop_nlink.cold+0x11/0x41 [ 40.763471] report_bug+0x262/0x2b0 [ 40.767104] do_error_trap+0x1e1/0x330 [ 40.770966] ? math_error+0x320/0x320 [ 40.774751] ? __irq_work_queue_local+0x155/0x200 [ 40.779571] ? irq_work_queue+0x29/0x80 [ 40.783519] ? error_entry+0x72/0xd0 [ 40.787207] ? trace_hardirqs_off_caller+0x6e/0x210 [ 40.792216] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.797046] invalid_op+0x14/0x20 [ 40.800475] RIP: 0010:drop_nlink.cold+0x11/0x41 [ 40.805115] Code: e0 5d 41 5c c3 e8 e6 25 ee ff e9 6e ff ff ff e8 6c 26 ee ff e9 32 ff ff ff e8 62 d7 b4 ff 48 c7 c7 80 0f 16 88 e8 05 53 9e ff <0f> 0b b8 ff ff 37 00 4c 89 e2 48 c1 ea 03 48 c1 e0 2a 0f b6 04 02 [ 40.824005] RSP: 0018:ffff8880a755fb08 EFLAGS: 00010286 [ 40.829338] RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000 [ 40.836576] RDX: 0000000000000000 RSI: ffffffff815b623f RDI: ffffed1014eabf53 [ 40.843817] RBP: ffff8880800280c0 R08: 0000000000000024 R09: 0000000000000000 [ 40.851058] R10: 0000000000000005 R11: 0000000000000000 R12: ffff888080028108 [ 40.858328] R13: 0000000000000000 R14: ffff8880800280c0 R15: ffff88808002a9e0 [ 40.865630] ? vprintk_func+0x7f/0x224 [ 40.869493] ? drop_nlink.cold+0x11/0x41 [ 40.873527] minix_rename+0x3e6/0x8d0 [ 40.877339] ? minix_mkdir+0x1b0/0x1b0 [ 40.881252] ? lock_two_nondirectories+0xd1/0x110 [ 40.886070] ? down_write_nested+0x36/0x90 [ 40.890283] vfs_rename+0x67e/0x1910 [ 40.894004] ? _raw_spin_unlock+0x29/0x40 [ 40.898124] ? vfs_link+0xc10/0xc10 [ 40.901725] ? minix_lookup+0xe5/0x190 [ 40.905588] ? security_path_rename+0x1ed/0x2e0 [ 40.910245] do_renameat2+0xb4c/0xc70 [ 40.914021] ? do_mknodat.part.0+0x480/0x480 [ 40.918404] ? kmem_cache_free+0x284/0x2b0 [ 40.922616] ? filp_open+0x70/0x70 [ 40.926131] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.931468] __x64_sys_renameat+0x96/0x100 [ 40.935675] ? lockdep_hardirqs_on+0x3c1/0x5e0 [ 40.940233] do_syscall_64+0xf9/0x670 [ 40.944009] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.949172] RIP: 0033:0x444729 [ 40.952338] Code: 8d d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 5b d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 40.971215] RSP: 002b:00007ffeca48e6c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 [ 40.978896] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444729 [ 40.986203] RDX: 0000000000000009 RSI: 0000000020000500 RDI: 000000000000000a [ 40.993461] RBP: 00000000006d0018 R08: 00000000004002e0 R09: 00000000004002e0 [ 41.000730] R10: 00000000200017c0 R11: 0000000000000246 R12: 0000000000402310 [ 41.007973] R13: 00000000004023a0 R14: 0000000000000000 R15: 0000000000000000 [ 41.016282] Kernel Offset: disabled [ 41.019940] Rebooting in 86400 seconds..