[[0;32m OK [0m] Started Serial Getty on ttyS0.
[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Started OpenBSD Secure Shell server.
[[0;32m OK [0m] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.81' (ECDSA) to the list of known hosts.
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syzkaller login: [ 28.910345] ==================================================================
[ 28.917719] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20
[ 28.924355] Read of size 8 at addr ffff8880b4a409a0 by task kworker/u4:2/32
[ 28.931419]
[ 28.933020] CPU: 1 PID: 32 Comm: kworker/u4:2 Not tainted 4.14.302-syzkaller #0
[ 28.940432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 28.949760] Workqueue: tipc_rcv tipc_recv_work
[ 28.954312] Call Trace:
[ 28.956870] dump_stack+0x1b2/0x281
[ 28.960469] print_address_description.cold+0x54/0x1d3
[ 28.965724] kasan_report_error.cold+0x8a/0x191
[ 28.970367] ? __lock_acquire+0x2c57/0x3f20
[ 28.974661] __asan_report_load8_noabort+0x68/0x70
[ 28.979568] ? tipc_subscrb_rcv_cb+0x2f0/0xa40
[ 28.984116] ? __lock_acquire+0x2c57/0x3f20
[ 28.988404] __lock_acquire+0x2c57/0x3f20
[ 28.992526] ? io_schedule_timeout+0x140/0x140
[ 28.997079] ? __wake_up_common_lock+0xcd/0x140
[ 29.001731] ? trace_hardirqs_on+0x10/0x10
[ 29.005935] ? trace_hardirqs_on+0x10/0x10
[ 29.010164] ? preempt_schedule_common+0x45/0xc0
[ 29.014893] ? ___preempt_schedule+0x16/0x18
[ 29.019272] ? tipc_recvmsg+0x43e/0x9e0
[ 29.023215] ? __local_bh_enable_ip+0x132/0x170
[ 29.027880] lock_acquire+0x170/0x3f0
[ 29.031658] ? tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.036216] _raw_spin_lock_bh+0x2f/0x40
[ 29.040247] ? tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.044798] tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.049351] tipc_receive_from_sock+0x25c/0x450
[ 29.053989] ? trace_hardirqs_on+0x10/0x10
[ 29.058193] ? lock_acquire+0x170/0x3f0
[ 29.062137] ? tipc_close_conn+0x200/0x200
[ 29.066343] tipc_recv_work+0x75/0xd0
[ 29.070133] process_one_work+0x793/0x14a0
[ 29.074355] ? work_busy+0x320/0x320
[ 29.078046] ? worker_thread+0x158/0xff0
[ 29.082082] ? _raw_spin_unlock_irq+0x24/0x80
[ 29.086549] worker_thread+0x5cc/0xff0
[ 29.090414] ? rescuer_thread+0xc80/0xc80
[ 29.094533] kthread+0x30d/0x420
[ 29.097881] ? kthread_create_on_node+0xd0/0xd0
[ 29.102521] ret_from_fork+0x24/0x30
[ 29.106204]
[ 29.107805] Allocated by task 32:
[ 29.111233] kasan_kmalloc+0xeb/0x160
[ 29.115004] kmem_cache_alloc_trace+0x131/0x3d0
[ 29.119821] tipc_subscrb_connect_cb+0x40/0x150
[ 29.124460] tipc_accept_from_sock+0x25b/0x400
[ 29.129013] tipc_recv_work+0x75/0xd0
[ 29.132795] process_one_work+0x793/0x14a0
[ 29.137010] worker_thread+0x5cc/0xff0
[ 29.140871] kthread+0x30d/0x420
[ 29.144207] ret_from_fork+0x24/0x30
[ 29.147889]
[ 29.149490] Freed by task 103:
[ 29.152658] kasan_slab_free+0xc3/0x1a0
[ 29.156604] kfree+0xc9/0x250
[ 29.159682] tipc_subscrb_put+0x22/0x30
[ 29.163631] tipc_close_conn+0x16a/0x200
[ 29.167661] tipc_send_work+0x41e/0x520
[ 29.171605] process_one_work+0x793/0x14a0
[ 29.175808] worker_thread+0x5cc/0xff0
[ 29.179665] kthread+0x30d/0x420
[ 29.182999] ret_from_fork+0x24/0x30
[ 29.186699]
[ 29.188298] The buggy address belongs to the object at ffff8880b4a40980
[ 29.188298] which belongs to the cache kmalloc-96 of size 96
[ 29.200758] The buggy address is located 32 bytes inside of
[ 29.200758] 96-byte region [ffff8880b4a40980, ffff8880b4a409e0)
[ 29.212434] The buggy address belongs to the page:
[ 29.217339] page:ffffea0002d29000 count:1 mapcount:0 mapping:ffff8880b4a40000 index:0xffff8880b4a40f00
[ 29.226773] flags: 0xfff00000000100(slab)
[ 29.230892] raw: 00fff00000000100 ffff8880b4a40000 ffff8880b4a40f00 0000000100000015
[ 29.238742] raw: ffffea0002be2aa0 ffffea000267bd60 ffff88813fe744c0 0000000000000000
[ 29.246592] page dumped because: kasan: bad access detected
[ 29.252271]
[ 29.253876] Memory state around the buggy address:
[ 29.258778] ffff8880b4a40880: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[ 29.266105] ffff8880b4a40900: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
[ 29.273434] >ffff8880b4a40980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[ 29.280761] ^
[ 29.285234] ffff8880b4a40a00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
[ 29.292652] ffff8880b4a40a80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
[ 29.299980] ==================================================================
[ 29.307307] Disabling lock debugging due to kernel taint
[ 29.312727] Kernel panic - not syncing: panic_on_warn set ...
[ 29.312727]
[ 29.320167] CPU: 1 PID: 32 Comm: kworker/u4:2 Tainted: G B 4.14.302-syzkaller #0
[ 29.328795] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[ 29.338126] Workqueue: tipc_rcv tipc_recv_work
[ 29.342676] Call Trace:
[ 29.345238] dump_stack+0x1b2/0x281
[ 29.348834] panic+0x1f9/0x42d
[ 29.351996] ? add_taint.cold+0x16/0x16
[ 29.355944] ? lock_downgrade+0x740/0x740
[ 29.360064] kasan_end_report+0x43/0x49
[ 29.364009] kasan_report_error.cold+0xa7/0x191
[ 29.368648] ? __lock_acquire+0x2c57/0x3f20
[ 29.372937] __asan_report_load8_noabort+0x68/0x70
[ 29.377837] ? tipc_subscrb_rcv_cb+0x2f0/0xa40
[ 29.382388] ? __lock_acquire+0x2c57/0x3f20
[ 29.386678] __lock_acquire+0x2c57/0x3f20
[ 29.390799] ? io_schedule_timeout+0x140/0x140
[ 29.395350] ? __wake_up_common_lock+0xcd/0x140
[ 29.399987] ? trace_hardirqs_on+0x10/0x10
[ 29.404192] ? trace_hardirqs_on+0x10/0x10
[ 29.408395] ? preempt_schedule_common+0x45/0xc0
[ 29.413120] ? ___preempt_schedule+0x16/0x18
[ 29.417500] ? tipc_recvmsg+0x43e/0x9e0
[ 29.421442] ? __local_bh_enable_ip+0x132/0x170
[ 29.426082] lock_acquire+0x170/0x3f0
[ 29.429853] ? tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.434408] _raw_spin_lock_bh+0x2f/0x40
[ 29.438441] ? tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.442991] tipc_subscrb_rcv_cb+0x4d4/0xa40
[ 29.447371] tipc_receive_from_sock+0x25c/0x450
[ 29.452009] ? trace_hardirqs_on+0x10/0x10
[ 29.456213] ? lock_acquire+0x170/0x3f0
[ 29.460155] ? tipc_close_conn+0x200/0x200
[ 29.464364] tipc_recv_work+0x75/0xd0
[ 29.468137] process_one_work+0x793/0x14a0
[ 29.472342] ? work_busy+0x320/0x320
[ 29.476026] ? worker_thread+0x158/0xff0
[ 29.480057] ? _raw_spin_unlock_irq+0x24/0x80
[ 29.484522] worker_thread+0x5cc/0xff0
[ 29.488380] ? rescuer_thread+0xc80/0xc80
[ 29.492496] kthread+0x30d/0x420
[ 29.495832] ? kthread_create_on_node+0xd0/0xd0
[ 29.500469] ret_from_fork+0x24/0x30
[ 29.504319] Kernel Offset: disabled
[ 29.507920] Rebooting in 86400 seconds..