audit: type=1800 audit(1572964032.491:14900): pid=1125 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=18097 res=0 BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: atomic_inc arch/x86/include/asm/atomic.h:92 [inline] IP: kthread_stop+0x4c/0x650 kernel/kthread.c:525 PGD 65ac4067 P4D 65ac4067 PUD 798d7067 PMD 0 kobject: 'loop5' (ffff8880a4ad2160): kobject_uevent_env Oops: 0002 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 1133 Comm: syz-executor.1 Not tainted 4.14.151 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop5' (ffff8880a4ad2160): fill_kobj_path: path = '/devices/virtual/block/loop5' task: ffff88808c32c640 task.stack: ffff88821a8e8000 RIP: 0010:atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RIP: 0010:kthread_stop+0x4c/0x650 kernel/kthread.c:525 RSP: 0018:ffff88821a8efb50 EFLAGS: 00010216 audit: type=1804 audit(1572964032.541:14901): pid=1125 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir055110801/syzkaller.o0Lfb0/676/file0" dev="sda1" ino=18097 res=1 audit: type=1800 audit(1572964032.541:14902): pid=1125 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=18097 res=0 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90009c4c000 RDX: 0000000000000364 RSI: ffffffff813e37ac RDI: 0000000000000282 RBP: ffff88821a8efb70 R08: ffff88808c32c640 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880717af9b0 R14: ffff8880717af9a8 R15: ffffffff89bc1d60 FS: 00007f282b8b2700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000 audit: type=1800 audit(1572964032.561:14903): pid=1140 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=18080 res=0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000020 CR3: 0000000098e8f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: vivid_stop_generating_vid_cap+0x1b9/0x664 drivers/media/platform/vivid/vivid-kthread-cap.c:934 vid_cap_stop_streaming+0x7c/0xd0 drivers/media/platform/vivid/vivid-vid-cap.c:273 audit: type=1804 audit(1572964032.561:14904): pid=1140 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir271318101/syzkaller.8Cm5sC/735/file0" dev="sda1" ino=18080 res=1 __vb2_queue_cancel+0xa3/0x890 drivers/media/v4l2-core/videobuf2-core.c:1655 audit: type=1800 audit(1572964032.561:14905): pid=1140 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=18080 res=0 vb2_core_streamoff+0x52/0x110 drivers/media/v4l2-core/videobuf2-core.c:1788 __vb2_cleanup_fileio+0x78/0x150 drivers/media/v4l2-core/videobuf2-core.c:2313 vb2_core_queue_release+0x1d/0x80 drivers/media/v4l2-core/videobuf2-core.c:2040 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline] _vb2_fop_release+0x1cf/0x2a0 drivers/media/v4l2-core/videobuf2-v4l2.c:840 vb2_fop_release+0x75/0xc0 drivers/media/v4l2-core/videobuf2-v4l2.c:854 vivid_fop_release+0x180/0x3f0 drivers/media/platform/vivid/vivid-core.c:486 v4l2_release+0xf9/0x190 drivers/media/v4l2-core/v4l2-dev.c:446 __fput+0x275/0x7a0 fs/file_table.c:210 ____fput+0x16/0x20 fs/file_table.c:244 task_work_run+0x114/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1da/0x220 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a219 RSP: 002b:00007f282b8b1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000000000045a219 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f282b8b26d4 R13: 00000000004faf72 R14: 00000000004d3238 R15: 00000000ffffffff Code: 00 65 8b 1d a7 49 c3 7e 83 fb 3f 0f 87 5e 04 00 00 e8 69 bc 1e 00 89 db 48 0f a3 1d bf 3f e7 06 0f 82 47 03 00 00 e8 54 bc 1e 00 41 ff 44 24 20 49 8d 7c 24 24 48 b8 00 00 00 00 00 fc ff df RIP: atomic_inc arch/x86/include/asm/atomic.h:92 [inline] RSP: ffff88821a8efb50 RIP: kthread_stop+0x4c/0x650 kernel/kthread.c:525 RSP: ffff88821a8efb50 CR2: 0000000000000020 kobject: 'loop4' (ffff8880a4a7d220): kobject_uevent_env kobject: 'loop4' (ffff8880a4a7d220): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (ffff8880a4ad2160): kobject_uevent_env kobject: 'loop5' (ffff8880a4ad2160): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (ffff8880a49fb7a0): kobject_uevent_env kobject: 'loop2' (ffff8880a49fb7a0): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (ffff8880a4a7d220): kobject_uevent_env kobject: 'loop0' (ffff8880a4964e20): kobject_uevent_env kobject: 'loop4' (ffff8880a4a7d220): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (ffff8880a4964e20): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (ffff8880a4964e20): kobject_uevent_env kobject: 'loop0' (ffff8880a4964e20): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (ffff8880a4a7d220): kobject_uevent_env kobject: 'loop4' (ffff8880a4a7d220): fill_kobj_path: path = '/devices/virtual/block/loop4' ---[ end trace 11b94676e6d62704 ]---