[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 122.689119][ T32] kauditd_printk_skb: 4 callbacks suppressed [ 122.689170][ T32] audit: type=1800 audit(1582346804.762:39): pid=11013 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 122.737234][ T32] audit: type=1800 audit(1582346804.792:40): pid=11013 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 126.787959][ T32] audit: type=1400 audit(1582346808.862:41): avc: denied { map } for pid=11187 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 [ 126.840116][T11185] sshd (11185) used greatest stack depth: 3352 bytes left Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. executing program [ 135.106416][ T32] audit: type=1400 audit(1582346817.182:42): avc: denied { map } for pid=11199 comm="syz-executor375" path="/root/syz-executor375483325" dev="sda1" ino=16482 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 135.169572][T11199] FAT-fs (loop0): error, invalid access to FAT (entry 0x00006500) [ 135.177646][T11199] FAT-fs (loop0): Filesystem has been set read-only [ 135.184456][T11199] ===================================================== [ 135.191415][T11199] BUG: KMSAN: uninit-value in fat_evict_inode+0x2f4/0x920 [ 135.198536][T11199] CPU: 0 PID: 11199 Comm: syz-executor375 Not tainted 5.6.0-rc2-syzkaller #0 [ 135.207310][T11199] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.217375][T11199] Call Trace: [ 135.220716][T11199] dump_stack+0x1c9/0x220 [ 135.225194][T11199] kmsan_report+0xf7/0x1e0 [ 135.229734][T11199] __msan_warning+0x58/0xa0 [ 135.234246][T11199] fat_evict_inode+0x2f4/0x920 [ 135.239014][T11199] ? fat_write_inode+0x250/0x250 [ 135.244054][T11199] evict+0x4ab/0xe10 [ 135.247954][T11199] iput+0xa70/0xe10 [ 135.251862][T11199] fat_build_inode+0x6a3/0x840 [ 135.256629][T11199] vfat_mkdir+0x547/0x7d0 [ 135.260963][T11199] ? vfat_unlink+0x660/0x660 [ 135.265651][T11199] vfs_mkdir+0x691/0x920 [ 135.269929][T11199] do_mkdirat+0x39f/0x680 [ 135.274254][T11199] __ia32_sys_mkdir+0x9f/0xd0 [ 135.278922][T11199] ? __se_sys_mkdir+0x90/0x90 [ 135.283682][T11199] do_fast_syscall_32+0x3c7/0x6e0 [ 135.288713][T11199] entry_SYSENTER_compat+0x68/0x77 [ 135.293815][T11199] RIP: 0023:0xf7f1bd99 [ 135.297868][T11199] Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 135.317550][T11199] RSP: 002b:00000000ffb4ff4c EFLAGS: 00000292 ORIG_RAX: 0000000000000027 [ 135.325986][T11199] RAX: ffffffffffffffda RBX: 0000000020000740 RCX: 0000000000000000 [ 135.333947][T11199] RDX: 0000000000000000 RSI: 00000000ffb4ffbe RDI: 0000000000000001 [ 135.342018][T11199] RBP: 00000000000000c2 R08: 0000000000000000 R09: 0000000000000000 [ 135.349992][T11199] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 135.358039][T11199] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 135.366733][T11199] [ 135.369160][T11199] Uninit was created at: [ 135.373609][T11199] kmsan_save_stack_with_flags+0x3c/0x90 [ 135.379231][T11199] kmsan_alloc_page+0x12a/0x310 [ 135.384068][T11199] __alloc_pages_nodemask+0x5712/0x5e80 [ 135.389729][T11199] alloc_pages_current+0x67d/0x990 [ 135.394838][T11199] alloc_slab_page+0x111/0x12f0 [ 135.399722][T11199] new_slab+0x2bc/0x1130 [ 135.403951][T11199] ___slab_alloc+0x1533/0x1f30 [ 135.408878][T11199] kmem_cache_alloc+0xb23/0xd70 [ 135.413719][T11199] fat_alloc_inode+0x58/0x120 [ 135.418382][T11199] new_inode_pseudo+0xb1/0x590 [ 135.423139][T11199] new_inode+0x5a/0x3d0 [ 135.427372][T11199] fat_fill_super+0x634b/0x89b0 [ 135.432237][T11199] vfat_fill_super+0xa6/0xc0 [ 135.436827][T11199] mount_bdev+0x654/0x880 [ 135.441140][T11199] vfat_mount+0xc9/0xe0 [ 135.445309][T11199] legacy_get_tree+0x169/0x2e0 [ 135.450069][T11199] vfs_get_tree+0xdd/0x580 [ 135.454500][T11199] do_mount+0x365c/0x4ac0 [ 135.458822][T11199] __se_compat_sys_mount+0x3a8/0xa10 [ 135.464090][T11199] __ia32_compat_sys_mount+0x157/0x1b0 [ 135.469578][T11199] do_fast_syscall_32+0x3c7/0x6e0 [ 135.474594][T11199] entry_SYSENTER_compat+0x68/0x77 [ 135.479882][T11199] ===================================================== [ 135.486793][T11199] Disabling lock debugging due to kernel taint [ 135.492935][T11199] Kernel panic - not syncing: panic_on_warn set ... [ 135.499514][T11199] CPU: 0 PID: 11199 Comm: syz-executor375 Tainted: G B 5.6.0-rc2-syzkaller #0 [ 135.509779][T11199] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.520340][T11199] Call Trace: [ 135.523643][T11199] dump_stack+0x1c9/0x220 [ 135.528004][T11199] panic+0x3d5/0xc3e [ 135.531910][T11199] kmsan_report+0x1df/0x1e0 [ 135.536410][T11199] __msan_warning+0x58/0xa0 [ 135.540989][T11199] fat_evict_inode+0x2f4/0x920 [ 135.545755][T11199] ? fat_write_inode+0x250/0x250 [ 135.550683][T11199] evict+0x4ab/0xe10 [ 135.554574][T11199] iput+0xa70/0xe10 [ 135.558408][T11199] fat_build_inode+0x6a3/0x840 [ 135.563694][T11199] vfat_mkdir+0x547/0x7d0 [ 135.568025][T11199] ? vfat_unlink+0x660/0x660 [ 135.572708][T11199] vfs_mkdir+0x691/0x920 [ 135.576942][T11199] do_mkdirat+0x39f/0x680 [ 135.581869][T11199] __ia32_sys_mkdir+0x9f/0xd0 [ 135.586552][T11199] ? __se_sys_mkdir+0x90/0x90 [ 135.591278][T11199] do_fast_syscall_32+0x3c7/0x6e0 [ 135.596318][T11199] entry_SYSENTER_compat+0x68/0x77 [ 135.601418][T11199] RIP: 0023:0xf7f1bd99 [ 135.605476][T11199] Code: 90 e8 0b 00 00 00 f3 90 0f ae e8 eb f9 8d 74 26 00 89 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 135.628195][T11199] RSP: 002b:00000000ffb4ff4c EFLAGS: 00000292 ORIG_RAX: 0000000000000027 [ 135.636599][T11199] RAX: ffffffffffffffda RBX: 0000000020000740 RCX: 0000000000000000 [ 135.644730][T11199] RDX: 0000000000000000 RSI: 00000000ffb4ffbe RDI: 0000000000000001 [ 135.652702][T11199] RBP: 00000000000000c2 R08: 0000000000000000 R09: 0000000000000000 [ 135.661213][T11199] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 135.669172][T11199] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 135.679042][T11199] Kernel Offset: 0x24200000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 135.690664][T11199] Rebooting in 86400 seconds..