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. [ 73.493638][ T27] kauditd_printk_skb: 6 callbacks suppressed [ 73.493650][ T27] audit: type=1800 audit(1576337517.772:39): pid=9451 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 [ 73.535293][ T27] audit: type=1800 audit(1576337517.772:40): pid=9451 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: [ 75.766754][ T27] audit: type=1400 audit(1576337520.042:41): avc: denied { map } for pid=9629 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 '10.128.0.111' (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 executing program [ 515.036878][ T27] audit: type=1400 audit(1576337959.312:42): avc: denied { map } for pid=9641 comm="syz-executor237" path="/root/syz-executor237434021" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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 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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 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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 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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 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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 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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 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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 program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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 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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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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 535.976044][T20699] ================================================================== [ 535.976189][T20699] BUG: KASAN: use-after-free in tty_open+0x6f8/0xbb0 [ 535.976201][T20699] Read of size 8 at addr ffff888095850200 by task syz-executor237/20699 [ 535.976204][T20699] [ 535.976219][T20699] CPU: 0 PID: 20699 Comm: syz-executor237 Not tainted 5.5.0-rc1-syzkaller #0 [ 535.976226][T20699] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 535.976231][T20699] Call Trace: [ 535.976294][T20699] dump_stack+0x197/0x210 [ 535.976307][T20699] ? tty_open+0x6f8/0xbb0 [ 535.976360][T20699] print_address_description.constprop.0.cold+0xd4/0x30b [ 535.976373][T20699] ? tty_open+0x6f8/0xbb0 [ 535.976385][T20699] ? tty_open+0x6f8/0xbb0 [ 535.976399][T20699] __kasan_report.cold+0x1b/0x41 [ 535.976414][T20699] ? tty_open+0x6f8/0xbb0 [ 535.976430][T20699] kasan_report+0x12/0x20 [ 535.976444][T20699] check_memory_region+0x134/0x1a0 [ 535.976460][T20699] __kasan_check_read+0x11/0x20 [ 535.976472][T20699] tty_open+0x6f8/0xbb0 [ 535.976491][T20699] ? tty_init_dev+0x470/0x470 [ 535.976538][T20699] ? do_raw_spin_unlock+0x178/0x270 [ 535.976554][T20699] ? tty_init_dev+0x470/0x470 [ 535.976584][T20699] chrdev_open+0x245/0x6b0 [ 535.976600][T20699] ? cdev_put.part.0+0x50/0x50 [ 535.976642][T20699] ? security_file_open+0x87/0x300 [ 535.976677][T20699] do_dentry_open+0x4e6/0x1380 [ 535.976689][T20699] ? __kasan_check_read+0x11/0x20 [ 535.976701][T20699] ? cdev_put.part.0+0x50/0x50 [ 535.976720][T20699] ? chown_common+0x5c0/0x5c0 [ 535.976755][T20699] ? inode_permission+0xb4/0x520 [ 535.976774][T20699] vfs_open+0xa0/0xd0 [ 535.976790][T20699] path_openat+0x10df/0x4500 [ 535.976803][T20699] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 535.976815][T20699] ? kasan_slab_alloc+0xf/0x20 [ 535.976831][T20699] ? kmem_cache_alloc+0x121/0x710 [ 535.976845][T20699] ? getname_flags+0xd6/0x5b0 [ 535.976857][T20699] ? getname+0x1a/0x20 [ 535.976869][T20699] ? do_sys_open+0x2c9/0x5d0 [ 535.976895][T20699] ? path_lookupat.isra.0+0x8d0/0x8d0 [ 535.976921][T20699] ? __alloc_fd+0x487/0x620 [ 535.976942][T20699] do_filp_open+0x1a1/0x280 [ 535.976958][T20699] ? may_open_dev+0x100/0x100 [ 535.976984][T20699] ? do_raw_spin_unlock+0x178/0x270 [ 535.977018][T20699] ? _raw_spin_unlock+0x28/0x40 [ 535.977046][T20699] do_sys_open+0x3fe/0x5d0 [ 535.977063][T20699] ? filp_open+0x80/0x80 [ 535.977100][T20699] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 535.977114][T20699] ? do_syscall_64+0x26/0x790 [ 535.977128][T20699] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.977141][T20699] ? do_syscall_64+0x26/0x790 [ 535.977159][T20699] __x64_sys_open+0x7e/0xc0 [ 535.977174][T20699] do_syscall_64+0xfa/0x790 [ 535.977192][T20699] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.977203][T20699] RIP: 0033:0x401040 [ 535.977217][T20699] Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 8d 26 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 [ 535.977225][T20699] RSP: 002b:00007ffc50417e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 535.977238][T20699] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401040 [ 535.977246][T20699] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffc50417e40 [ 535.977254][T20699] RBP: 0000000000082d77 R08: 0000000000000000 R09: 000000000000000d [ 535.977263][T20699] R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402060 [ 535.977271][T20699] R13: 00000000004020f0 R14: 0000000000000000 R15: 0000000000000000 [ 535.977289][T20699] [ 535.977296][T20699] Allocated by task 20697: [ 535.977308][T20699] save_stack+0x23/0x90 [ 535.977325][T20699] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 535.977336][T20699] kasan_kmalloc+0x9/0x10 [ 535.977346][T20699] kmem_cache_alloc_trace+0x158/0x790 [ 535.977366][T20699] vc_allocate+0x1fc/0x760 [ 535.977377][T20699] con_install+0x52/0x410 [ 535.977388][T20699] tty_init_dev+0xf9/0x470 [ 535.977398][T20699] tty_open+0x4a5/0xbb0 [ 535.977408][T20699] chrdev_open+0x245/0x6b0 [ 535.977420][T20699] do_dentry_open+0x4e6/0x1380 [ 535.977430][T20699] vfs_open+0xa0/0xd0 [ 535.977442][T20699] path_openat+0x10df/0x4500 [ 535.977454][T20699] do_filp_open+0x1a1/0x280 [ 535.977464][T20699] do_sys_open+0x3fe/0x5d0 [ 535.977475][T20699] __x64_sys_open+0x7e/0xc0 [ 535.977487][T20699] do_syscall_64+0xfa/0x790 [ 535.977499][T20699] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.977503][T20699] [ 535.977510][T20699] Freed by task 20699: [ 535.977521][T20699] save_stack+0x23/0x90 [ 535.977532][T20699] __kasan_slab_free+0x102/0x150 [ 535.977543][T20699] kasan_slab_free+0xe/0x10 [ 535.977553][T20699] kfree+0x10a/0x2c0 [ 535.977589][T20699] vt_disallocate_all+0x2bd/0x3e0 [ 535.977599][T20699] vt_ioctl+0xc38/0x26d0 [ 535.977610][T20699] tty_ioctl+0xa37/0x14f0 [ 535.977621][T20699] do_vfs_ioctl+0x977/0x14e0 [ 535.977631][T20699] ksys_ioctl+0xab/0xd0 [ 535.977641][T20699] __x64_sys_ioctl+0x73/0xb0 [ 535.977654][T20699] do_syscall_64+0xfa/0x790 [ 535.977666][T20699] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.977670][T20699] [ 535.977680][T20699] The buggy address belongs to the object at ffff888095850000 [ 535.977680][T20699] which belongs to the cache kmalloc-2k of size 2048 [ 535.977692][T20699] The buggy address is located 512 bytes inside of [ 535.977692][T20699] 2048-byte region [ffff888095850000, ffff888095850800) [ 535.977697][T20699] The buggy address belongs to the page: [ 535.977709][T20699] page:ffffea0002561400 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 535.977727][T20699] raw: 00fffe0000000200 ffffea0002157d08 ffffea00029fec08 ffff8880aa400e00 [ 535.977742][T20699] raw: 0000000000000000 ffff888095850000 0000000100000001 0000000000000000 [ 535.977748][T20699] page dumped because: kasan: bad access detected [ 535.977752][T20699] [ 535.977756][T20699] Memory state around the buggy address: [ 535.977767][T20699] ffff888095850100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 535.977777][T20699] ffff888095850180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 535.977787][T20699] >ffff888095850200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 535.977792][T20699] ^ [ 535.977802][T20699] ffff888095850280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 535.977811][T20699] ffff888095850300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 535.977815][T20699] ================================================================== [ 535.977819][T20699] Disabling lock debugging due to kernel taint [ 535.986138][T20699] Kernel panic - not syncing: panic_on_warn set ... [ 535.986153][T20699] CPU: 0 PID: 20699 Comm: syz-executor237 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 535.986164][T20699] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 535.986171][T20699] Call Trace: [ 535.986191][T20699] dump_stack+0x197/0x210 [ 535.986252][T20699] panic+0x2e3/0x75c [ 535.986267][T20699] ? add_taint.cold+0x16/0x16 [ 535.986283][T20699] ? tty_open+0x6f8/0xbb0 [ 535.986308][T20699] ? preempt_schedule+0x4b/0x60 [ 535.986329][T20699] ? ___preempt_schedule+0x16/0x18 [ 535.986351][T20699] ? trace_hardirqs_on+0x5e/0x240 [ 535.986365][T20699] ? tty_open+0x6f8/0xbb0 [ 535.986378][T20699] end_report+0x47/0x4f [ 535.986392][T20699] ? tty_open+0x6f8/0xbb0 [ 535.986405][T20699] __kasan_report.cold+0xe/0x41 [ 535.986419][T20699] ? tty_open+0x6f8/0xbb0 [ 535.986432][T20699] kasan_report+0x12/0x20 [ 535.986446][T20699] check_memory_region+0x134/0x1a0 [ 535.986460][T20699] __kasan_check_read+0x11/0x20 [ 535.986473][T20699] tty_open+0x6f8/0xbb0 [ 535.986487][T20699] ? tty_init_dev+0x470/0x470 [ 535.986503][T20699] ? do_raw_spin_unlock+0x178/0x270 [ 535.986517][T20699] ? tty_init_dev+0x470/0x470 [ 535.986531][T20699] chrdev_open+0x245/0x6b0 [ 535.986545][T20699] ? cdev_put.part.0+0x50/0x50 [ 535.986560][T20699] ? security_file_open+0x87/0x300 [ 535.986575][T20699] do_dentry_open+0x4e6/0x1380 [ 535.986588][T20699] ? __kasan_check_read+0x11/0x20 [ 535.986601][T20699] ? cdev_put.part.0+0x50/0x50 [ 535.986616][T20699] ? chown_common+0x5c0/0x5c0 [ 535.986631][T20699] ? inode_permission+0xb4/0x520 [ 535.986645][T20699] vfs_open+0xa0/0xd0 [ 535.986660][T20699] path_openat+0x10df/0x4500 [ 535.986673][T20699] ? __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 535.986686][T20699] ? kasan_slab_alloc+0xf/0x20 [ 535.986699][T20699] ? kmem_cache_alloc+0x121/0x710 [ 535.986713][T20699] ? getname_flags+0xd6/0x5b0 [ 535.986727][T20699] ? getname+0x1a/0x20 [ 535.986739][T20699] ? do_sys_open+0x2c9/0x5d0 [ 535.986756][T20699] ? path_lookupat.isra.0+0x8d0/0x8d0 [ 535.986771][T20699] ? __alloc_fd+0x487/0x620 [ 535.986786][T20699] do_filp_open+0x1a1/0x280 [ 535.986801][T20699] ? may_open_dev+0x100/0x100 [ 535.986818][T20699] ? do_raw_spin_unlock+0x178/0x270 [ 535.986833][T20699] ? _raw_spin_unlock+0x28/0x40 [ 535.986854][T20699] do_sys_open+0x3fe/0x5d0 [ 535.986867][T20699] ? filp_open+0x80/0x80 [ 535.986882][T20699] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 535.986897][T20699] ? do_syscall_64+0x26/0x790 [ 535.986911][T20699] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.986925][T20699] ? do_syscall_64+0x26/0x790 [ 535.986938][T20699] __x64_sys_open+0x7e/0xc0 [ 535.986953][T20699] do_syscall_64+0xfa/0x790 [ 535.986967][T20699] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 535.986979][T20699] RIP: 0033:0x401040 [ 535.986995][T20699] Code: 01 f0 ff ff 0f 83 c0 0b 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 8d 26 2d 00 00 75 14 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 94 0b 00 00 c3 48 83 ec 08 e8 fa 00 00 00 [ 535.987000][T20699] RSP: 002b:00007ffc50417e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 535.987009][T20699] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000401040 [ 535.987014][T20699] RDX: 0000000000000000 RSI: 0000000000000002 RDI: 00007ffc50417e40 [ 535.987020][T20699] RBP: 0000000000082d77 R08: 0000000000000000 R09: 000000000000000d [ 535.987027][T20699] R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000402060 [ 535.987034][T20699] R13: 00000000004020f0 R14: 0000000000000000 R15: 0000000000000000 [ 535.988364][T20699] Kernel Offset: disabled