Warning: Permanently added '10.128.0.158' (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 [ 35.376142] ================================================================== [ 35.383668] BUG: KASAN: use-after-free in snd_mixer_oss_get_volume1+0x574/0x610 [ 35.391470] Read of size 4 at addr ffff888098918084 by task syz-executor087/8128 [ 35.398997] [ 35.400635] CPU: 1 PID: 8128 Comm: syz-executor087 Not tainted 4.19.206-syzkaller #0 [ 35.408521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.418068] Call Trace: [ 35.420663] dump_stack+0x1fc/0x2ef executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.424307] print_address_description.cold+0x54/0x219 [ 35.429596] kasan_report_error.cold+0x8a/0x1b9 [ 35.434277] ? snd_mixer_oss_get_volume1+0x574/0x610 [ 35.439386] __asan_report_load4_noabort+0x88/0x90 [ 35.444341] ? snd_mixer_oss_get_volume1+0x574/0x610 [ 35.449466] snd_mixer_oss_get_volume1+0x574/0x610 [ 35.454417] snd_mixer_oss_ioctl1+0x236/0x18f0 [ 35.459008] ? snd_mixer_oss_get_volume1_vol.isra.0+0x5d0/0x5d0 [ 35.465086] ? snd_mixer_oss_put_recsrc2+0x560/0x560 [ 35.470241] ? do_wp_page+0x2dc/0x2210 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.474142] ? finish_mkwrite_fault+0x640/0x640 [ 35.478820] ? __handle_mm_fault+0x15f6/0x41c0 [ 35.483417] ? mark_held_locks+0xf0/0xf0 [ 35.487493] ? __handle_mm_fault+0xf34/0x41c0 [ 35.492008] snd_mixer_oss_ioctl+0x40/0x50 [ 35.496253] ? snd_mixer_oss_ioctl_compat+0x60/0x60 [ 35.501278] do_vfs_ioctl+0xcdb/0x12e0 [ 35.505184] ? ioctl_preallocate+0x200/0x200 [ 35.509613] ? __do_page_fault+0x6d1/0xd60 [ 35.513978] ? lock_downgrade+0x720/0x720 [ 35.518143] ? up_read+0x17/0x110 [ 35.521610] ? __do_page_fault+0x180/0xd60 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.525863] ksys_ioctl+0x9b/0xc0 [ 35.529395] __x64_sys_ioctl+0x6f/0xb0 [ 35.533296] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 35.537885] do_syscall_64+0xf9/0x620 [ 35.541793] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.547000] RIP: 0033:0x440339 [ 35.550197] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 35.569101] RSP: 002b:00007ffdb4003348 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.576820] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440339 [ 35.584094] RDX: 0000000000000000 RSI: 0000000080254d18 RDI: 0000000000000003 [ 35.591380] RBP: 00000000004830b6 R08: 0000000000000001 R09: 0000000000000001 [ 35.598654] R10: 00007ffdb4002dc0 R11: 0000000000000246 R12: 0000000000008a17 [ 35.605928] R13: 00007ffdb400335c R14: 00007ffdb4003370 R15: 00007ffdb4003360 [ 35.613212] [ 35.614840] Allocated by task 8127: [ 35.618483] kmem_cache_alloc_trace+0x12f/0x380 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.623162] snd_mixer_oss_build_input+0x640/0xd80 [ 35.628106] snd_mixer_oss_proc_write+0x37e/0x530 [ 35.632957] snd_info_text_entry_release+0xfa/0x260 [ 35.637980] close_pdeo.part.0+0xda/0x2f0 [ 35.642137] proc_reg_release+0x21e/0x270 [ 35.646292] __fput+0x2ce/0x890 [ 35.649579] task_work_run+0x148/0x1c0 [ 35.653615] do_exit+0xbf3/0x2be0 [ 35.657076] do_group_exit+0x125/0x310 [ 35.660970] __x64_sys_exit_group+0x3a/0x50 [ 35.665294] do_syscall_64+0xf9/0x620 [ 35.669108] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.674308] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.675931] Freed by task 8125: [ 35.679258] kfree+0xcc/0x210 [ 35.682370] snd_mixer_oss_slot_free+0xf3/0x130 [ 35.687040] mixer_slot_clear+0x5a/0xb0 [ 35.691022] snd_mixer_oss_build_input+0x7d3/0xd80 [ 35.695959] snd_mixer_oss_proc_write+0x37e/0x530 [ 35.700813] snd_info_text_entry_release+0xfa/0x260 [ 35.705837] close_pdeo.part.0+0xda/0x2f0 [ 35.709993] proc_reg_release+0x21e/0x270 [ 35.714150] __fput+0x2ce/0x890 [ 35.717440] task_work_run+0x148/0x1c0 [ 35.721333] do_exit+0xbf3/0x2be0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.724793] do_group_exit+0x125/0x310 [ 35.728690] __x64_sys_exit_group+0x3a/0x50 [ 35.733108] do_syscall_64+0xf9/0x620 [ 35.737009] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 35.742195] [ 35.743823] The buggy address belongs to the object at ffff888098918080 [ 35.743823] which belongs to the cache kmalloc-96 of size 96 [ 35.756315] The buggy address is located 4 bytes inside of [ 35.756315] 96-byte region [ffff888098918080, ffff8880989180e0) [ 35.767931] The buggy address belongs to the page: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.772868] page:ffffea0002624600 count:1 mapcount:0 mapping:ffff88813bff04c0 index:0x0 [ 35.781017] flags: 0xfff00000000100(slab) [ 35.785172] raw: 00fff00000000100 ffffea0002bee108 ffffea0002aea848 ffff88813bff04c0 [ 35.793152] raw: 0000000000000000 ffff888098918000 0000000100000020 0000000000000000 [ 35.801044] page dumped because: kasan: bad access detected [ 35.806753] [ 35.808414] Memory state around the buggy address: [ 35.813343] ffff888098917f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.820724] ffff888098918000: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.828100] >ffff888098918080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 35.835550] ^ [ 35.838925] ffff888098918100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 35.846377] ffff888098918180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 35.853734] ================================================================== [ 35.861097] 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 [ 35.878741] Kernel panic - not syncing: panic_on_warn set ... [ 35.878741] [ 35.886130] CPU: 1 PID: 8128 Comm: syz-executor087 Tainted: G B 4.19.206-syzkaller #0 [ 35.895580] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.904928] Call Trace: [ 35.907550] dump_stack+0x1fc/0x2ef [ 35.911186] panic+0x26a/0x50e [ 35.914380] ? __warn_printk+0xf3/0xf3 [ 35.918270] ? preempt_schedule_common+0x45/0xc0 [ 35.923029] ? ___preempt_schedule+0x16/0x18 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.927442] ? trace_hardirqs_on+0x55/0x210 [ 35.931768] kasan_end_report+0x43/0x49 [ 35.935750] kasan_report_error.cold+0xa7/0x1b9 [ 35.940421] ? snd_mixer_oss_get_volume1+0x574/0x610 [ 35.945613] __asan_report_load4_noabort+0x88/0x90 [ 35.950543] ? snd_mixer_oss_get_volume1+0x574/0x610 [ 35.955737] snd_mixer_oss_get_volume1+0x574/0x610 [ 35.960688] snd_mixer_oss_ioctl1+0x236/0x18f0 [ 35.965281] ? snd_mixer_oss_get_volume1_vol.isra.0+0x5d0/0x5d0 [ 35.971341] ? snd_mixer_oss_put_recsrc2+0x560/0x560 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 35.976445] ? do_wp_page+0x2dc/0x2210 [ 35.980377] ? finish_mkwrite_fault+0x640/0x640 [ 35.985062] ? __handle_mm_fault+0x15f6/0x41c0 [ 35.989997] ? mark_held_locks+0xf0/0xf0 [ 35.994066] ? __handle_mm_fault+0xf34/0x41c0 [ 35.998568] snd_mixer_oss_ioctl+0x40/0x50 [ 36.002800] ? snd_mixer_oss_ioctl_compat+0x60/0x60 [ 36.007862] do_vfs_ioctl+0xcdb/0x12e0 [ 36.011752] ? ioctl_preallocate+0x200/0x200 [ 36.016166] ? __do_page_fault+0x6d1/0xd60 [ 36.020402] ? lock_downgrade+0x720/0x720 [ 36.024581] ? up_read+0x17/0x110 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.028127] ? __do_page_fault+0x180/0xd60 [ 36.032453] ksys_ioctl+0x9b/0xc0 [ 36.035907] __x64_sys_ioctl+0x6f/0xb0 [ 36.039799] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.044379] do_syscall_64+0xf9/0x620 [ 36.048183] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.053657] RIP: 0033:0x440339 [ 36.056845] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.076276] RSP: 002b:00007ffdb4003348 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 36.083987] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 0000000000440339 [ 36.091253] RDX: 0000000000000000 RSI: 0000000080254d18 RDI: 0000000000000003 [ 36.098521] RBP: 00000000004830b6 R08: 0000000000000001 R09: 0000000000000001 [ 36.105795] R10: 00007ffdb4002dc0 R11: 0000000000000246 R12: 0000000000008a17 [ 36.113063] R13: 00007ffdb400335c R14: 00007ffdb4003370 R15: 00007ffdb4003360 [ 36.121956] Kernel Offset: disabled [ 36.125570] Rebooting in 86400 seconds..