[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 260.183711] audit: type=1400 audit(1602449626.536:8): avc: denied { execmem } for pid=6373 comm="syz-executor456" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 277.078642] ================================================================== [ 277.086314] BUG: KASAN: use-after-free in __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.094116] Read of size 8 at addr ffff8880a7c06f40 by task syz-executor456/19845 [ 277.101711] [ 277.103319] CPU: 0 PID: 19845 Comm: syz-executor456 Not tainted 4.14.198-syzkaller #0 [ 277.111259] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 277.120604] Call Trace: [ 277.123248] dump_stack+0x1b2/0x283 [ 277.126903] print_address_description.cold+0x54/0x1d3 [ 277.132168] kasan_report_error.cold+0x8a/0x194 [ 277.136814] ? __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.142248] __asan_report_load8_noabort+0x68/0x70 [ 277.147156] ? __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.152583] __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.157878] ? vgem_fence_attach_ioctl+0x35f/0x6e0 [ 277.162800] ? mutex_lock_io_nested+0x11d0/0x11d0 [ 277.167694] ? lock_downgrade+0x740/0x740 [ 277.171869] ? reservation_object_test_signaled_rcu+0x2ab/0xa10 [ 277.177941] vgem_fence_attach_ioctl+0x35f/0x6e0 [ 277.182683] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.187244] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.191865] drm_ioctl_kernel+0x14c/0x200 [ 277.195994] drm_ioctl+0x419/0x870 [ 277.199541] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.204106] ? drm_getstats+0x20/0x20 [ 277.207883] ? trace_hardirqs_on+0x10/0x10 [ 277.212416] ? futex_exit_release+0x220/0x220 [ 277.216895] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 277.222014] ? drm_getstats+0x20/0x20 [ 277.225850] do_vfs_ioctl+0x75a/0xff0 [ 277.229677] ? selinux_inode_setxattr+0x730/0x730 [ 277.234501] ? ioctl_preallocate+0x1a0/0x1a0 [ 277.238919] ? lock_downgrade+0x740/0x740 [ 277.243064] ? __fget+0x225/0x360 [ 277.246524] ? security_file_ioctl+0x83/0xb0 [ 277.250920] SyS_ioctl+0x7f/0xb0 [ 277.254262] ? do_vfs_ioctl+0xff0/0xff0 [ 277.258214] do_syscall_64+0x1d5/0x640 [ 277.262090] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 277.267265] RIP: 0033:0x44a519 [ 277.270440] RSP: 002b:00007f70215badb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 277.278123] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a519 [ 277.285389] RDX: 0000000020000140 RSI: 00000000c10c5541 RDI: 0000000000000004 [ 277.292651] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 277.299898] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 277.307160] R13: 00007fffb6c0ad8f R14: 00007f70215bb9c0 R15: 20c49ba5e353f7cf [ 277.314419] [ 277.316023] Allocated by task 19845: [ 277.319716] kasan_kmalloc+0xeb/0x160 [ 277.323493] __kmalloc+0x15a/0x400 [ 277.327022] dma_buf_export+0x20b/0xa20 [ 277.331033] drm_gem_dmabuf_export+0x17/0x70 [ 277.335439] drm_gem_prime_export+0x16c/0x1d0 [ 277.339912] vgem_fence_attach_ioctl+0x4e0/0x6e0 [ 277.344643] drm_ioctl_kernel+0x14c/0x200 [ 277.348785] drm_ioctl+0x419/0x870 [ 277.352307] do_vfs_ioctl+0x75a/0xff0 [ 277.356090] SyS_ioctl+0x7f/0xb0 [ 277.359449] do_syscall_64+0x1d5/0x640 [ 277.363313] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 277.368491] [ 277.370094] Freed by task 19846: [ 277.373440] kasan_slab_free+0xc3/0x1a0 [ 277.377393] kfree+0xc9/0x250 [ 277.380495] dma_buf_release+0x2f7/0x5c0 [ 277.384581] __fput+0x25f/0x7a0 [ 277.387868] task_work_run+0x11f/0x190 [ 277.391747] exit_to_usermode_loop+0x1ad/0x200 [ 277.396317] do_syscall_64+0x4a3/0x640 [ 277.400226] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 277.405393] [ 277.407016] The buggy address belongs to the object at ffff8880a7c06dc0 [ 277.407016] which belongs to the cache kmalloc-1024 of size 1024 [ 277.419822] The buggy address is located 384 bytes inside of [ 277.419822] 1024-byte region [ffff8880a7c06dc0, ffff8880a7c071c0) [ 277.431758] The buggy address belongs to the page: [ 277.436664] page:ffffea00029f0180 count:1 mapcount:0 mapping:ffff8880a7c06040 index:0x0 compound_mapcount: 0 [ 277.446606] flags: 0xfffe0000008100(slab|head) [ 277.451163] raw: 00fffe0000008100 ffff8880a7c06040 0000000000000000 0000000100000007 [ 277.459020] raw: ffffea00029e08a0 ffffea00029fd9a0 ffff88812fe50ac0 0000000000000000 [ 277.466896] page dumped because: kasan: bad access detected [ 277.472580] [ 277.474186] Memory state around the buggy address: [ 277.479096] ffff8880a7c06e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 277.486433] ffff8880a7c06e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 277.493786] >ffff8880a7c06f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 277.501119] ^ [ 277.506543] ffff8880a7c06f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 277.513890] ffff8880a7c07000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 277.521222] ================================================================== [ 277.528572] Disabling lock debugging due to kernel taint [ 277.534095] random: crng init done [ 277.537626] random: 7 urandom warning(s) missed due to ratelimiting [ 277.544403] Kernel panic - not syncing: panic_on_warn set ... [ 277.544403] [ 277.551772] CPU: 0 PID: 19845 Comm: syz-executor456 Tainted: G B 4.14.198-syzkaller #0 [ 277.560938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 277.570283] Call Trace: [ 277.572849] dump_stack+0x1b2/0x283 [ 277.576538] panic+0x1f9/0x42d [ 277.579717] ? add_taint.cold+0x16/0x16 [ 277.583690] kasan_end_report+0x43/0x49 [ 277.587658] kasan_report_error.cold+0xa7/0x194 [ 277.592305] ? __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.597729] __asan_report_load8_noabort+0x68/0x70 [ 277.602654] ? __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.608081] __ww_mutex_lock.constprop.0+0x229d/0x29e0 [ 277.613335] ? vgem_fence_attach_ioctl+0x35f/0x6e0 [ 277.618242] ? mutex_lock_io_nested+0x11d0/0x11d0 [ 277.623060] ? lock_downgrade+0x740/0x740 [ 277.627184] ? reservation_object_test_signaled_rcu+0x2ab/0xa10 [ 277.633220] vgem_fence_attach_ioctl+0x35f/0x6e0 [ 277.637956] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.642530] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.647091] drm_ioctl_kernel+0x14c/0x200 [ 277.651220] drm_ioctl+0x419/0x870 [ 277.654739] ? __vgem_fence_idr_fini+0x50/0x50 [ 277.659348] ? drm_getstats+0x20/0x20 [ 277.663127] ? trace_hardirqs_on+0x10/0x10 [ 277.667337] ? futex_exit_release+0x220/0x220 [ 277.671811] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 277.676897] ? drm_getstats+0x20/0x20 [ 277.680696] do_vfs_ioctl+0x75a/0xff0 [ 277.684486] ? selinux_inode_setxattr+0x730/0x730 [ 277.689304] ? ioctl_preallocate+0x1a0/0x1a0 [ 277.693705] ? lock_downgrade+0x740/0x740 [ 277.697834] ? __fget+0x225/0x360 [ 277.701271] ? security_file_ioctl+0x83/0xb0 [ 277.705669] SyS_ioctl+0x7f/0xb0 [ 277.709025] ? do_vfs_ioctl+0xff0/0xff0 [ 277.712979] do_syscall_64+0x1d5/0x640 [ 277.716848] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 277.722025] RIP: 0033:0x44a519 [ 277.725189] RSP: 002b:00007f70215badb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 277.732871] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 000000000044a519 [ 277.740113] RDX: 0000000020000140 RSI: 00000000c10c5541 RDI: 0000000000000004 [ 277.747357] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 277.754600] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 277.761860] R13: 00007fffb6c0ad8f R14: 00007f70215bb9c0 R15: 20c49ba5e353f7cf [ 277.770601] Kernel Offset: disabled [ 277.774217] Rebooting in 86400 seconds..