Warning: Permanently added '10.128.0.28' (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 syzkaller login: [ 51.252350] audit: type=1400 audit(1596595795.254:8): avc: denied { execmem } for pid=6461 comm="syz-executor288" 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 [ 51.644763] ================================================================== [ 51.652419] BUG: KASAN: use-after-free in ex_handler_refcount+0x18f/0x1c0 [ 51.659618] Write of size 4 at addr ffff8880a0d0d5d8 by task kworker/1:1/24 [ 51.666803] [ 51.668475] CPU: 1 PID: 24 Comm: kworker/1:1 Not tainted 4.19.136-syzkaller #0 [ 51.676181] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.685993] Workqueue: events do_enable_set [ 51.690577] Call Trace: [ 51.693209] dump_stack+0x1fc/0x2fe [ 51.697194] print_address_description.cold+0x54/0x219 [ 51.702568] kasan_report_error.cold+0x8a/0x1c7 [ 51.707297] ? ex_handler_refcount+0x18f/0x1c0 [ 51.711888] __asan_report_store4_noabort+0x88/0x90 [ 51.716928] ? ex_handler_refcount+0x18f/0x1c0 [ 51.721523] ex_handler_refcount+0x18f/0x1c0 [ 51.725945] ? ex_handler_clear_fs+0xb0/0xb0 [ 51.730360] fixup_exception+0x8a/0xc3 [ 51.734255] do_trap+0x61/0x250 [ 51.737566] do_error_trap+0x15d/0x310 [ 51.741561] ? math_error+0x310/0x310 [ 51.745412] ? csum_partial_copy_generic+0x6074/0x7805 [ 51.750719] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.755599] invalid_op+0x14/0x20 [ 51.759065] RIP: 0010:csum_partial_copy_generic+0x6074/0x7805 [ 51.765038] Code: 49 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 49 8d 8c 24 b8 02 00 00 0f 0b 48 8d 4d 18 <0f> 0b 48 8d 8d b8 02 00 00 0f 0b 48 8d 4b 18 0f 0b 48 8d 8d 80 00 [ 51.783945] RSP: 0018:ffff8880a94d7c20 EFLAGS: 00010297 [ 51.789315] RAX: ffff8880a94bc640 RBX: 0000000000000001 RCX: ffff8880a0d0d5d8 [ 51.796686] RDX: 0000000000000000 RSI: ffffffff86813650 RDI: ffff8880a0d0d5c0 [ 51.803961] RBP: ffff8880a0d0d5c0 R08: 0000000000000000 R09: 0000000000000008 [ 51.811233] R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae72bb10 [ 51.818524] R13: ffff8880a942a400 R14: ffff8880ae72bac0 R15: ffff888094a25480 [ 51.825828] ? l2cap_chan_put+0x10/0x1c0 [ 51.829906] do_enable_set+0x4ef/0x975 [ 51.833810] ? process_one_work+0x77b/0x1570 [ 51.838229] ? chan_recv_cb+0xa70/0xa70 [ 51.842565] ? check_preemption_disabled+0x41/0x280 [ 51.847594] process_one_work+0x864/0x1570 [ 51.851849] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 51.856893] worker_thread+0x64c/0x1130 [ 51.860885] ? __kthread_parkme+0xfd/0x1b0 [ 51.865136] ? process_one_work+0x1570/0x1570 [ 51.869643] kthread+0x30b/0x410 [ 51.873016] ? kthread_park+0x180/0x180 [ 51.876999] ret_from_fork+0x24/0x30 [ 51.880721] [ 51.882359] Allocated by task 24: [ 51.885816] kmem_cache_alloc_trace+0x12f/0x380 [ 51.891007] l2cap_chan_create+0x40/0x380 [ 51.895159] do_enable_set+0x525/0x975 [ 51.899052] process_one_work+0x864/0x1570 [ 51.903461] worker_thread+0x64c/0x1130 [ 51.907437] kthread+0x30b/0x410 [ 51.910815] ret_from_fork+0x24/0x30 [ 51.914528] [ 51.916153] Freed by task 14: [ 51.919277] kfree+0xcc/0x210 [ 51.922388] l2cap_chan_put+0x16b/0x1c0 [ 51.926373] do_enable_set+0x4ef/0x975 [ 51.930268] process_one_work+0x864/0x1570 [ 51.934506] worker_thread+0x64c/0x1130 [ 51.938494] kthread+0x30b/0x410 [ 51.941868] ret_from_fork+0x24/0x30 [ 51.945596] [ 51.947229] The buggy address belongs to the object at ffff8880a0d0d5c0 [ 51.947229] which belongs to the cache kmalloc-2048 of size 2048 [ 51.960069] The buggy address is located 24 bytes inside of [ 51.960069] 2048-byte region [ffff8880a0d0d5c0, ffff8880a0d0ddc0) [ 51.972424] The buggy address belongs to the page: [ 51.977372] page:ffffea0002834300 count:1 mapcount:0 mapping:ffff88812c39cc40 index:0x0 compound_mapcount: 0 [ 51.987695] flags: 0xfffe0000008100(slab|head) [ 51.992315] raw: 00fffe0000008100 ffffea00028d3188 ffffea00028ec888 ffff88812c39cc40 [ 52.000203] raw: 0000000000000000 ffff8880a0d0c4c0 0000000100000003 0000000000000000 [ 52.008090] page dumped because: kasan: bad access detected [ 52.013797] [ 52.015433] Memory state around the buggy address: [ 52.020450] ffff8880a0d0d480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 52.027810] ffff8880a0d0d500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 52.035170] >ffff8880a0d0d580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 52.042574] ^ [ 52.048809] ffff8880a0d0d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.056168] ffff8880a0d0d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.063552] ================================================================== [ 52.070904] Disabling lock debugging due to kernel taint [ 52.076847] Kernel panic - not syncing: panic_on_warn set ... [ 52.076847] [ 52.084227] CPU: 1 PID: 24 Comm: kworker/1:1 Tainted: G B 4.19.136-syzkaller #0 [ 52.092971] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.102332] Workqueue: events do_enable_set [ 52.106647] Call Trace: [ 52.109239] dump_stack+0x1fc/0x2fe [ 52.112886] panic+0x26a/0x50e [ 52.116080] ? __warn_printk+0xf3/0xf3 [ 52.119974] ? preempt_schedule_common+0x45/0xc0 [ 52.124734] ? ___preempt_schedule+0x16/0x18 [ 52.129143] ? trace_hardirqs_on+0x55/0x210 [ 52.133468] kasan_end_report+0x43/0x49 [ 52.137444] kasan_report_error.cold+0xa7/0x1c7 [ 52.142115] ? ex_handler_refcount+0x18f/0x1c0 [ 52.146789] __asan_report_store4_noabort+0x88/0x90 [ 52.151816] ? ex_handler_refcount+0x18f/0x1c0 [ 52.156448] ex_handler_refcount+0x18f/0x1c0 [ 52.160864] ? ex_handler_clear_fs+0xb0/0xb0 [ 52.165466] fixup_exception+0x8a/0xc3 [ 52.169392] do_trap+0x61/0x250 [ 52.172676] do_error_trap+0x15d/0x310 [ 52.176568] ? math_error+0x310/0x310 [ 52.180372] ? csum_partial_copy_generic+0x6074/0x7805 [ 52.185767] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 52.190710] invalid_op+0x14/0x20 [ 52.194169] RIP: 0010:csum_partial_copy_generic+0x6074/0x7805 [ 52.200048] Code: 49 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 49 8d 8c 24 b8 02 00 00 0f 0b 48 8d 4d 18 <0f> 0b 48 8d 8d b8 02 00 00 0f 0b 48 8d 4b 18 0f 0b 48 8d 8d 80 00 [ 52.219236] RSP: 0018:ffff8880a94d7c20 EFLAGS: 00010297 [ 52.224607] RAX: ffff8880a94bc640 RBX: 0000000000000001 RCX: ffff8880a0d0d5d8 [ 52.232231] RDX: 0000000000000000 RSI: ffffffff86813650 RDI: ffff8880a0d0d5c0 [ 52.239527] RBP: ffff8880a0d0d5c0 R08: 0000000000000000 R09: 0000000000000008 [ 52.246884] R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae72bb10 [ 52.254154] R13: ffff8880a942a400 R14: ffff8880ae72bac0 R15: ffff888094a25480 [ 52.261436] ? l2cap_chan_put+0x10/0x1c0 [ 52.265515] do_enable_set+0x4ef/0x975 [ 52.269407] ? process_one_work+0x77b/0x1570 [ 52.273919] ? chan_recv_cb+0xa70/0xa70 [ 52.277986] ? check_preemption_disabled+0x41/0x280 [ 52.283096] process_one_work+0x864/0x1570 [ 52.287513] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 52.292198] worker_thread+0x64c/0x1130 [ 52.296182] ? __kthread_parkme+0xfd/0x1b0 [ 52.300428] ? process_one_work+0x1570/0x1570 [ 52.304935] kthread+0x30b/0x410 [ 52.308301] ? kthread_park+0x180/0x180 [ 52.312295] ret_from_fork+0x24/0x30 [ 52.317547] Kernel Offset: disabled [ 52.321164] Rebooting in 86400 seconds..