[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 29.337118] audit: type=1804 audit(1604727933.072:2): pid=7987 uid=0 auid=0 ses=5 op="invalid_pcr" cause="open_writers" comm="syz-executor352" name="/root/bus" dev="sda1" ino=15707 res=1 [ 29.337825] TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. [ 29.366182] ================================================================== [ 29.373618] BUG: KASAN: use-after-free in padata_parallel_worker+0x2b0/0x2e0 [ 29.380785] Write of size 8 at addr ffff8880b4690618 by task kworker/0:2/4631 [ 29.388202] [ 29.389825] CPU: 0 PID: 4631 Comm: kworker/0:2 Not tainted 4.14.204-syzkaller #0 [ 29.397331] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.406716] Workqueue: pencrypt padata_parallel_worker [ 29.411999] Call Trace: [ 29.414569] dump_stack+0x1b2/0x283 [ 29.418185] print_address_description.cold+0x54/0x1d3 [ 29.423451] kasan_report_error.cold+0x8a/0x194 [ 29.428364] ? padata_parallel_worker+0x2b0/0x2e0 [ 29.433184] __asan_report_store8_noabort+0x68/0x70 [ 29.438181] ? padata_parallel_worker+0x2b0/0x2e0 [ 29.443002] padata_parallel_worker+0x2b0/0x2e0 [ 29.447665] ? lock_acquire+0x170/0x3f0 [ 29.451617] ? invoke_padata_reorder+0x40/0x40 [ 29.456189] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 29.461617] process_one_work+0x793/0x14a0 [ 29.465833] ? work_busy+0x320/0x320 [ 29.469541] ? worker_thread+0x158/0xff0 [ 29.473581] ? _raw_spin_unlock_irq+0x24/0x80 [ 29.478059] worker_thread+0x5cc/0xff0 [ 29.481947] ? rescuer_thread+0xc80/0xc80 [ 29.486073] kthread+0x30d/0x420 [ 29.489489] ? kthread_create_on_node+0xd0/0xd0 [ 29.494134] ret_from_fork+0x24/0x30 [ 29.497826] [ 29.499479] Allocated by task 7987: [ 29.503090] kasan_kmalloc+0xeb/0x160 [ 29.506870] __kmalloc+0x15a/0x400 [ 29.510406] tls_push_record+0xfa/0x1270 [ 29.514464] tls_sw_sendpage+0x760/0xb50 [ 29.518501] inet_sendpage+0x155/0x590 [ 29.522365] sock_sendpage+0xdf/0x140 [ 29.526143] pipe_to_sendpage+0x226/0x2d0 [ 29.530265] __splice_from_pipe+0x326/0x7a0 [ 29.534562] generic_splice_sendpage+0xc1/0x110 [ 29.539205] direct_splice_actor+0x115/0x160 [ 29.543594] splice_direct_to_actor+0x27c/0x730 [ 29.548341] do_splice_direct+0x164/0x210 [ 29.552463] do_sendfile+0x47f/0xb30 [ 29.556151] SyS_sendfile64+0xff/0x110 [ 29.560029] do_syscall_64+0x1d5/0x640 [ 29.563891] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.569073] [ 29.570674] Freed by task 7987: [ 29.573928] kasan_slab_free+0xc3/0x1a0 [ 29.577876] kfree+0xc9/0x250 [ 29.580956] tls_push_record+0xc3b/0x1270 [ 29.585089] tls_sw_sendpage+0x760/0xb50 [ 29.589140] inet_sendpage+0x155/0x590 [ 29.593002] sock_sendpage+0xdf/0x140 [ 29.596780] pipe_to_sendpage+0x226/0x2d0 [ 29.600899] __splice_from_pipe+0x326/0x7a0 [ 29.605196] generic_splice_sendpage+0xc1/0x110 [ 29.609838] direct_splice_actor+0x115/0x160 [ 29.614220] splice_direct_to_actor+0x27c/0x730 [ 29.618862] do_splice_direct+0x164/0x210 [ 29.622987] do_sendfile+0x47f/0xb30 [ 29.626676] SyS_sendfile64+0xff/0x110 [ 29.630556] do_syscall_64+0x1d5/0x640 [ 29.634418] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.639576] [ 29.641178] The buggy address belongs to the object at ffff8880b46905c0 [ 29.641178] which belongs to the cache kmalloc-256 of size 256 [ 29.653805] The buggy address is located 88 bytes inside of [ 29.653805] 256-byte region [ffff8880b46905c0, ffff8880b46906c0) [ 29.665563] The buggy address belongs to the page: [ 29.670466] page:ffffea0002d1a400 count:1 mapcount:0 mapping:ffff8880b46900c0 index:0x0 [ 29.678599] flags: 0xfff00000000100(slab) [ 29.682724] raw: 00fff00000000100 ffff8880b46900c0 0000000000000000 000000010000000c [ 29.690579] raw: ffffea00028e8160 ffffea0002c29ba0 ffff88813fe807c0 0000000000000000 [ 29.698430] page dumped because: kasan: bad access detected [ 29.704113] [ 29.705717] Memory state around the buggy address: [ 29.710617] ffff8880b4690500: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc [ 29.717971] ffff8880b4690580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 29.725304] >ffff8880b4690600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 29.732639] ^ [ 29.736767] ffff8880b4690680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 29.744098] ffff8880b4690700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 29.751432] ================================================================== [ 29.758765] Disabling lock debugging due to kernel taint [ 29.764643] Kernel panic - not syncing: panic_on_warn set ... [ 29.764643] [ 29.771980] CPU: 0 PID: 4631 Comm: kworker/0:2 Tainted: G B 4.14.204-syzkaller #0 [ 29.780705] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.790039] Workqueue: pencrypt padata_parallel_worker [ 29.795287] Call Trace: [ 29.797849] dump_stack+0x1b2/0x283 [ 29.801450] panic+0x1f9/0x42d [ 29.804618] ? add_taint.cold+0x16/0x16 [ 29.808567] kasan_end_report+0x43/0x49 [ 29.812517] kasan_report_error.cold+0xa7/0x194 [ 29.817161] ? padata_parallel_worker+0x2b0/0x2e0 [ 29.821978] __asan_report_store8_noabort+0x68/0x70 [ 29.826987] ? padata_parallel_worker+0x2b0/0x2e0 [ 29.831817] padata_parallel_worker+0x2b0/0x2e0 [ 29.836462] ? lock_acquire+0x170/0x3f0 [ 29.840408] ? invoke_padata_reorder+0x40/0x40 [ 29.844963] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 29.850386] process_one_work+0x793/0x14a0 [ 29.854612] ? work_busy+0x320/0x320 [ 29.858296] ? worker_thread+0x158/0xff0 [ 29.862336] ? _raw_spin_unlock_irq+0x24/0x80 [ 29.866813] worker_thread+0x5cc/0xff0 [ 29.870675] ? rescuer_thread+0xc80/0xc80 [ 29.874811] kthread+0x30d/0x420 [ 29.878176] ? kthread_create_on_node+0xd0/0xd0 [ 29.882829] ret_from_fork+0x24/0x30 [ 29.887678] Kernel Offset: disabled [ 29.891282] Rebooting in 86400 seconds..