[ 49.221943] audit: type=1800 audit(1582898990.594:30): pid=8141 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=2490 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 55.653036] kauditd_printk_skb: 4 callbacks suppressed [ 55.653049] audit: type=1400 audit(1582898997.034:35): avc: denied { map } for pid=8315 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 '10.128.0.251' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 62.597448] audit: type=1400 audit(1582899003.984:36): avc: denied { map } for pid=8327 comm="syz-executor482" path="/root/syz-executor482272061" dev="sda1" ino=16484 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 [ 63.167402] ================================================================== [ 63.174941] BUG: KASAN: use-after-free in ex_handler_refcount+0x18f/0x1c0 [ 63.181881] Write of size 4 at addr ffff8880982bf558 by task kworker/0:1/14 [ 63.188973] [ 63.190599] CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 4.19.106-syzkaller #0 [ 63.197962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.207332] Workqueue: events do_enable_set [ 63.211664] Call Trace: [ 63.214279] dump_stack+0x188/0x20d executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.217922] ? ex_handler_refcount+0x18f/0x1c0 [ 63.222515] print_address_description.cold+0x7c/0x212 [ 63.227809] ? ex_handler_refcount+0x18f/0x1c0 [ 63.232404] kasan_report.cold+0x88/0x2b9 [ 63.236723] ex_handler_refcount+0x18f/0x1c0 [ 63.241140] ? ex_handler_clear_fs+0xb0/0xb0 [ 63.245558] fixup_exception+0x8a/0xc3 [ 63.249467] do_trap+0x72/0x230 [ 63.252759] do_error_trap+0x15d/0x310 [ 63.256659] ? math_error+0x310/0x310 [ 63.260484] ? csum_partial_copy_generic+0x6675/0x864e [ 63.265785] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 63.270634] invalid_op+0x14/0x20 [ 63.274091] RIP: 0010:csum_partial_copy_generic+0x6675/0x864e [ 63.279974] Code: 8d 8c 24 80 00 00 00 0f 0b 48 8d 8d 80 00 00 00 0f 0b 48 8d 8d 80 00 00 00 0f 0b 48 8d 0b 0f 0b 48 8d 4d 00 0f 0b 48 8d 4b 18 <0f> 0b 48 8d 8b b8 02 00 00 0f 0b 49 8d 8c 24 b8 02 00 00 0f 0b 48 [ 63.298878] RSP: 0018:ffff8880a9ee7c50 EFLAGS: 00010297 [ 63.304240] RAX: ffff8880a9ed8380 RBX: ffff8880982bf540 RCX: ffff8880982bf558 [ 63.311504] RDX: 0000000000000000 RSI: ffffffff866555aa RDI: ffff8880982bf540 [ 63.318800] RBP: ffff8880982bf558 R08: ffff8880a9ed8380 R09: ffffed1015cc4733 [ 63.326074] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: 0000000000000000 [ 63.333349] R13: ffff8880a7ae7f00 R14: ffff8880a9e16800 R15: ffff8880ae62ba80 [ 63.340654] ? l2cap_chan_put+0xa/0x40 [ 63.344551] do_enable_set+0x4d1/0x8d0 [ 63.348455] ? process_one_work+0x82c/0x1640 [ 63.352874] ? lowpan_control_write+0x480/0x480 [ 63.357548] ? __lock_is_held+0xad/0x140 [ 63.361617] process_one_work+0x91f/0x1640 [ 63.365862] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.370542] worker_thread+0x96/0xe20 [ 63.374370] ? process_one_work+0x1640/0x1640 [ 63.378873] kthread+0x34a/0x420 [ 63.382245] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 63.387846] ret_from_fork+0x24/0x30 [ 63.391572] [ 63.393199] Allocated by task 14: [ 63.396660] kasan_kmalloc+0xbf/0xe0 [ 63.400378] kmem_cache_alloc_trace+0x14d/0x7a0 [ 63.405059] l2cap_chan_create+0x40/0x380 [ 63.409210] chan_create+0xc/0xd0 [ 63.412667] do_enable_set+0x507/0x8d0 [ 63.416556] process_one_work+0x91f/0x1640 [ 63.420882] worker_thread+0x96/0xe20 [ 63.424787] kthread+0x34a/0x420 [ 63.428155] ret_from_fork+0x24/0x30 [ 63.431860] [ 63.433487] Freed by task 3389: [ 63.436765] __kasan_slab_free+0xf7/0x140 [ 63.440916] kfree+0xce/0x220 [ 63.444025] l2cap_chan_put+0x35/0x40 [ 63.447830] do_enable_set+0x4d1/0x8d0 [ 63.451727] process_one_work+0x91f/0x1640 [ 63.456024] worker_thread+0x96/0xe20 [ 63.459831] kthread+0x34a/0x420 [ 63.463202] ret_from_fork+0x24/0x30 [ 63.466925] [ 63.468552] The buggy address belongs to the object at ffff8880982bf540 [ 63.468552] which belongs to the cache kmalloc-2048 of size 2048 [ 63.481387] The buggy address is located 24 bytes inside of [ 63.481387] 2048-byte region [ffff8880982bf540, ffff8880982bfd40) [ 63.493264] The buggy address belongs to the page: [ 63.498197] page:ffffea000260af80 count:1 mapcount:0 mapping:ffff88812c3dcc40 index:0x0 compound_mapcount: 0 [ 63.508168] flags: 0xfffe0000008100(slab|head) [ 63.512758] raw: 00fffe0000008100 ffffea00025f3d88 ffffea0002572308 ffff88812c3dcc40 [ 63.520640] raw: 0000000000000000 ffff8880982be440 0000000100000003 0000000000000000 [ 63.528515] page dumped because: kasan: bad access detected [ 63.534238] [ 63.535857] Memory state around the buggy address: [ 63.540779] ffff8880982bf400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 63.548134] ffff8880982bf480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 63.555490] >ffff8880982bf500: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 63.562854] ^ executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.569081] ffff8880982bf580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.576437] ffff8880982bf600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 63.583797] ================================================================== [ 63.591144] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.659230] Kernel panic - not syncing: panic_on_warn set ... [ 63.659230] [ 63.666646] CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G B 4.19.106-syzkaller #0 [ 63.675501] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.684870] Workqueue: events do_enable_set [ 63.689200] Call Trace: [ 63.691807] dump_stack+0x188/0x20d [ 63.695445] panic+0x26a/0x50e [ 63.698649] ? __warn_printk+0xf3/0xf3 [ 63.702551] ? preempt_schedule_common+0x4a/0xc0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.707323] ? ex_handler_refcount+0x18f/0x1c0 [ 63.711915] ? ___preempt_schedule+0x16/0x18 [ 63.716345] ? trace_hardirqs_on+0x55/0x210 [ 63.720678] ? ex_handler_refcount+0x18f/0x1c0 [ 63.725271] kasan_end_report+0x43/0x49 [ 63.729257] kasan_report.cold+0xa4/0x2b9 [ 63.733421] ex_handler_refcount+0x18f/0x1c0 [ 63.737839] ? ex_handler_clear_fs+0xb0/0xb0 [ 63.742255] fixup_exception+0x8a/0xc3 [ 63.746155] do_trap+0x72/0x230 [ 63.749500] do_error_trap+0x15d/0x310 [ 63.753411] ? math_error+0x310/0x310 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.757223] ? csum_partial_copy_generic+0x6675/0x864e [ 63.762518] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 63.767376] invalid_op+0x14/0x20 [ 63.770840] RIP: 0010:csum_partial_copy_generic+0x6675/0x864e [ 63.776731] Code: 8d 8c 24 80 00 00 00 0f 0b 48 8d 8d 80 00 00 00 0f 0b 48 8d 8d 80 00 00 00 0f 0b 48 8d 0b 0f 0b 48 8d 4d 00 0f 0b 48 8d 4b 18 <0f> 0b 48 8d 8b b8 02 00 00 0f 0b 49 8d 8c 24 b8 02 00 00 0f 0b 48 [ 63.795636] RSP: 0018:ffff8880a9ee7c50 EFLAGS: 00010297 [ 63.801002] RAX: ffff8880a9ed8380 RBX: ffff8880982bf540 RCX: ffff8880982bf558 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.808276] RDX: 0000000000000000 RSI: ffffffff866555aa RDI: ffff8880982bf540 [ 63.815550] RBP: ffff8880982bf558 R08: ffff8880a9ed8380 R09: ffffed1015cc4733 [ 63.822821] R10: ffffed1015cc4732 R11: ffff8880ae623993 R12: 0000000000000000 [ 63.830098] R13: ffff8880a7ae7f00 R14: ffff8880a9e16800 R15: ffff8880ae62ba80 [ 63.837389] ? l2cap_chan_put+0xa/0x40 [ 63.841312] do_enable_set+0x4d1/0x8d0 [ 63.845209] ? process_one_work+0x82c/0x1640 [ 63.849649] ? lowpan_control_write+0x480/0x480 [ 63.854330] ? __lock_is_held+0xad/0x140 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 63.858408] process_one_work+0x91f/0x1640 [ 63.862656] ? pwq_dec_nr_in_flight+0x310/0x310 [ 63.867340] worker_thread+0x96/0xe20 [ 63.871168] ? process_one_work+0x1640/0x1640 [ 63.875675] kthread+0x34a/0x420 [ 63.879051] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 63.884600] ret_from_fork+0x24/0x30 [ 63.889392] Kernel Offset: disabled [ 63.893054] Rebooting in 86400 seconds..