[ 63.387574][ T26] audit: type=1800 audit(1560626888.244:30): pid=8643 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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: [ 66.736272][ T26] kauditd_printk_skb: 4 callbacks suppressed [ 66.736286][ T26] audit: type=1400 audit(1560626891.634:35): avc: denied { map } for pid=8820 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 '10.128.15.220' (ECDSA) to the list of known hosts. executing program [ 73.373323][ T26] audit: type=1400 audit(1560626898.274:36): avc: denied { map } for pid=8832 comm="syz-executor988" path="/root/syz-executor988595677" 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 [ 73.391265][ T8833] IPVS: ftp: loaded support on port[0] = 21 [ 73.430027][ T8833] BUG: Dentry 00000000ec7b047b{i=1,n=/} still in use (2) [unmount of sysfs sysfs] [ 73.439864][ T8833] WARNING: CPU: 0 PID: 8833 at fs/dcache.c:1529 umount_check.cold+0xe9/0x10a [ 73.448626][ T8833] Kernel panic - not syncing: panic_on_warn set ... [ 73.455204][ T8833] CPU: 0 PID: 8833 Comm: syz-executor988 Not tainted 5.2.0-rc4+ #25 [ 73.463159][ T8833] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.473193][ T8833] Call Trace: [ 73.476470][ T8833] dump_stack+0x172/0x1f0 [ 73.482238][ T8833] ? umount_check.cold+0x86/0x10a [ 73.487245][ T8833] panic+0x2cb/0x744 [ 73.491160][ T8833] ? __warn_printk+0xf3/0xf3 [ 73.495733][ T8833] ? umount_check.cold+0xe9/0x10a [ 73.500734][ T8833] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 73.506975][ T8833] ? __warn.cold+0x5/0x4d [ 73.511284][ T8833] ? __warn+0xe8/0x1d0 [ 73.515331][ T8833] ? umount_check.cold+0xe9/0x10a [ 73.520332][ T8833] __warn.cold+0x20/0x4d [ 73.524554][ T8833] ? umount_check.cold+0xe9/0x10a [ 73.529577][ T8833] report_bug+0x263/0x2b0 [ 73.533904][ T8833] do_error_trap+0x11b/0x200 [ 73.538491][ T8833] do_invalid_op+0x37/0x50 [ 73.542885][ T8833] ? umount_check.cold+0xe9/0x10a [ 73.547904][ T8833] invalid_op+0x14/0x20 [ 73.552036][ T8833] RIP: 0010:umount_check.cold+0xe9/0x10a [ 73.557647][ T8833] Code: 89 ff e8 00 5c f0 ff 48 81 c3 68 06 00 00 45 89 e8 4c 89 e1 53 4d 8b 0f 4c 89 f2 4c 89 e6 48 c7 c7 c0 ff 75 87 e8 a1 bd a1 ff <0f> 0b 58 e9 bd 2a ff ff e8 d0 5b f0 ff e9 29 ff ff ff 45 31 f6 e9 [ 73.577245][ T8833] RSP: 0018:ffff88807967fbb8 EFLAGS: 00010282 [ 73.583295][ T8833] RAX: 0000000000000050 RBX: ffff8880957dd128 RCX: 0000000000000000 [ 73.591263][ T8833] RDX: 0000000000000000 RSI: ffffffff815ac956 RDI: ffffed100f2cff69 [ 73.599231][ T8833] RBP: ffff88807967fbe8 R08: 0000000000000050 R09: ffff888079a6a8c8 [ 73.607194][ T8833] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807d269340 [ 73.615155][ T8833] R13: 0000000000000002 R14: 0000000000000001 R15: ffffffff88c939a0 [ 73.623128][ T8833] ? vprintk_func+0x86/0x189 [ 73.627715][ T8833] ? umount_check.cold+0xe9/0x10a [ 73.632737][ T8833] d_walk+0x194/0x950 [ 73.636711][ T8833] ? select_collect+0x420/0x420 [ 73.641555][ T8833] do_one_tree+0x28/0x40 [ 73.645783][ T8833] shrink_dcache_for_umount+0x72/0x170 [ 73.651219][ T8833] generic_shutdown_super+0x6d/0x370 [ 73.656480][ T8833] kill_anon_super+0x3e/0x60 [ 73.661065][ T8833] kernfs_kill_sb+0x165/0x1e3 [ 73.665724][ T8833] sysfs_kill_sb+0x23/0x40 [ 73.670133][ T8833] deactivate_locked_super+0x95/0x100 [ 73.675515][ T8833] deactivate_super+0x1b2/0x1d0 [ 73.680357][ T8833] ? mount_ns+0x1d0/0x1d0 [ 73.684665][ T8833] ? dput+0x38/0x690 [ 73.688536][ T8833] ? dput+0x1e6/0x690 [ 73.692496][ T8833] cleanup_mnt+0xbf/0x160 [ 73.696803][ T8833] __cleanup_mnt+0x16/0x20 [ 73.701200][ T8833] task_work_run+0x145/0x1c0 [ 73.705771][ T8833] exit_to_usermode_loop+0x273/0x2c0 [ 73.711035][ T8833] do_syscall_64+0x58e/0x680 [ 73.715604][ T8833] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 73.721493][ T8833] RIP: 0033:0x400e80 [ 73.725381][ T8833] Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 4d 18 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00 [ 73.745059][ T8833] RSP: 002b:00007fff39f4db28 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 73.753469][ T8833] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000400e80 [ 73.761441][ T8833] RDX: 00000000004409b9 RSI: 0000000000000000 RDI: 0000000000000004 [ 73.769484][ T8833] RBP: 00000000004a2190 R08: 0000000000000100 R09: 0000000000000100 [ 73.777448][ T8833] R10: 0000000000000100 R11: 0000000000000246 R12: 0000000000401f00 [ 73.785399][ T8833] R13: 0000000000401f90 R14: 0000000000000000 R15: 0000000000000000 [ 73.795155][ T8833] Kernel Offset: disabled [ 73.799605][ T8833] Rebooting in 86400 seconds..