[ OK ] Started Getty on tty1. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.37' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 30.528865] ================================================================== [ 30.536322] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 30.543070] Read of size 8 at addr ffff8880af1b13d8 by task syz-executor152/10049 [ 30.550845] [ 30.552454] CPU: 1 PID: 10049 Comm: syz-executor152 Not tainted 4.14.292-syzkaller #0 [ 30.560392] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 30.569723] Call Trace: [ 30.572290] dump_stack+0x1b2/0x281 [ 30.575897] print_address_description.cold+0x54/0x1d3 [ 30.581157] kasan_report_error.cold+0x8a/0x191 [ 30.585812] ? __list_add_valid+0x93/0xa0 [ 30.589946] __asan_report_load8_noabort+0x68/0x70 [ 30.594859] ? __list_add_valid+0x93/0xa0 [ 30.599089] __list_add_valid+0x93/0xa0 [ 30.603053] rdma_listen+0x656/0x9b0 [ 30.606759] ucma_listen+0x10b/0x170 [ 30.610449] ? ucma_bind_ip+0x150/0x150 [ 30.614406] ? _copy_from_user+0x96/0x100 [ 30.618573] ? ucma_bind_ip+0x150/0x150 [ 30.622713] ucma_write+0x206/0x2c0 [ 30.626314] ? ucma_set_ib_path+0x510/0x510 [ 30.630724] __vfs_write+0xe4/0x630 [ 30.634414] ? ucma_set_ib_path+0x510/0x510 [ 30.638717] ? kernel_read+0x110/0x110 [ 30.642595] ? common_file_perm+0x3ee/0x580 [ 30.647334] ? security_file_permission+0x82/0x1e0 [ 30.652245] ? rw_verify_area+0xe1/0x2a0 [ 30.656304] vfs_write+0x17f/0x4d0 [ 30.659878] SyS_write+0xf2/0x210 [ 30.663348] ? SyS_read+0x210/0x210 [ 30.666959] ? do_syscall_64+0x4c/0x640 [ 30.671173] ? SyS_read+0x210/0x210 [ 30.674780] do_syscall_64+0x1d5/0x640 [ 30.678651] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.683819] RIP: 0033:0x7f0cafbe1ae9 [ 30.687551] RSP: 002b:00007f0cafb722f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 30.695329] RAX: ffffffffffffffda RBX: 0000000000000020 RCX: 00007f0cafbe1ae9 [ 30.702865] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 30.710216] RBP: 00007f0cafc69418 R08: 00007f0cafb72700 R09: 0000000000000000 [ 30.717464] R10: 00007f0cafb72700 R11: 0000000000000246 R12: 00007f0cafc67130 [ 30.724727] R13: 00007f0cafc69410 R14: 00007f0cafc6941c R15: 0100000000000000 [ 30.731981] [ 30.733585] Allocated by task 10043: [ 30.737285] kasan_kmalloc+0xeb/0x160 [ 30.741064] kmem_cache_alloc_trace+0x131/0x3d0 [ 30.745722] rdma_create_id+0x57/0x4c0 [ 30.749590] ucma_create_id+0x18b/0x500 [ 30.753540] ucma_write+0x206/0x2c0 [ 30.757148] __vfs_write+0xe4/0x630 [ 30.760751] vfs_write+0x17f/0x4d0 [ 30.764269] SyS_write+0xf2/0x210 [ 30.767701] do_syscall_64+0x1d5/0x640 [ 30.771563] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.776726] [ 30.778326] Freed by task 10045: [ 30.781670] kasan_slab_free+0xc3/0x1a0 [ 30.785620] kfree+0xc9/0x250 [ 30.788963] ucma_close+0x11a/0x340 [ 30.792669] __fput+0x25f/0x7a0 [ 30.796016] task_work_run+0x11f/0x190 [ 30.799896] do_exit+0xa44/0x2850 [ 30.803347] do_group_exit+0x100/0x2e0 [ 30.807223] get_signal+0x38d/0x1ca0 [ 30.810915] do_signal+0x7c/0x1550 [ 30.814444] exit_to_usermode_loop+0x160/0x200 [ 30.819007] do_syscall_64+0x4a3/0x640 [ 30.822879] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.828052] [ 30.829764] The buggy address belongs to the object at ffff8880af1b1200 [ 30.829764] which belongs to the cache kmalloc-1024 of size 1024 [ 30.843153] The buggy address is located 472 bytes inside of [ 30.843153] 1024-byte region [ffff8880af1b1200, ffff8880af1b1600) [ 30.855623] The buggy address belongs to the page: [ 30.860810] page:ffffea0002bc6c00 count:1 mapcount:0 mapping:ffff8880af1b0000 index:0x0 compound_mapcount: 0 [ 30.871064] flags: 0xfff00000008100(slab|head) [ 30.875636] raw: 00fff00000008100 ffff8880af1b0000 0000000000000000 0000000100000007 [ 30.883608] raw: ffffea0002b94b20 ffff88813fe64848 ffff88813fe74ac0 0000000000000000 [ 30.892006] page dumped because: kasan: bad access detected [ 30.897829] [ 30.899474] Memory state around the buggy address: [ 30.904407] ffff8880af1b1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.911756] ffff8880af1b1300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.919168] >ffff8880af1b1380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.926605] ^ [ 30.933039] ffff8880af1b1400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.940374] ffff8880af1b1480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 30.947881] ================================================================== [ 30.955667] Disabling lock debugging due to kernel taint [ 30.964642] Kernel panic - not syncing: panic_on_warn set ... [ 30.964642] [ 30.972019] CPU: 0 PID: 10049 Comm: syz-executor152 Tainted: G B 4.14.292-syzkaller #0 [ 30.981192] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 30.990532] Call Trace: [ 30.993107] dump_stack+0x1b2/0x281 [ 30.996901] panic+0x1f9/0x42d [ 31.000502] ? add_taint.cold+0x16/0x16 [ 31.004538] ? ___preempt_schedule+0x16/0x18 [ 31.008928] kasan_end_report+0x43/0x49 [ 31.012887] kasan_report_error.cold+0xa7/0x191 [ 31.017614] ? __list_add_valid+0x93/0xa0 [ 31.021789] __asan_report_load8_noabort+0x68/0x70 [ 31.026711] ? __list_add_valid+0x93/0xa0 [ 31.030834] __list_add_valid+0x93/0xa0 [ 31.034800] rdma_listen+0x656/0x9b0 [ 31.038488] ucma_listen+0x10b/0x170 [ 31.042181] ? ucma_bind_ip+0x150/0x150 [ 31.046272] ? _copy_from_user+0x96/0x100 [ 31.050599] ? ucma_bind_ip+0x150/0x150 [ 31.054916] ucma_write+0x206/0x2c0 [ 31.058524] ? ucma_set_ib_path+0x510/0x510 [ 31.062832] __vfs_write+0xe4/0x630 [ 31.066447] ? ucma_set_ib_path+0x510/0x510 [ 31.070763] ? kernel_read+0x110/0x110 [ 31.075155] ? common_file_perm+0x3ee/0x580 [ 31.079556] ? security_file_permission+0x82/0x1e0 [ 31.084462] ? rw_verify_area+0xe1/0x2a0 [ 31.088497] vfs_write+0x17f/0x4d0 [ 31.092040] SyS_write+0xf2/0x210 [ 31.095658] ? SyS_read+0x210/0x210 [ 31.099275] ? do_syscall_64+0x4c/0x640 [ 31.103338] ? SyS_read+0x210/0x210 [ 31.106959] do_syscall_64+0x1d5/0x640 [ 31.110824] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 31.115989] RIP: 0033:0x7f0cafbe1ae9 [ 31.119674] RSP: 002b:00007f0cafb722f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 31.127360] RAX: ffffffffffffffda RBX: 0000000000000020 RCX: 00007f0cafbe1ae9 [ 31.134716] RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000003 [ 31.142047] RBP: 00007f0cafc69418 R08: 00007f0cafb72700 R09: 0000000000000000 [ 31.149638] R10: 00007f0cafb72700 R11: 0000000000000246 R12: 00007f0cafc67130 [ 31.156888] R13: 00007f0cafc69410 R14: 00007f0cafc6941c R15: 0100000000000000 [ 31.164320] Kernel Offset: disabled [ 31.167968] Rebooting in 86400 seconds..