audit: type=1326 audit(1545618787.435:33): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 audit: type=1326 audit(1545618787.435:34): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 ================================================================== BUG: KASAN: null-ptr-deref in atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline] BUG: KASAN: null-ptr-deref in kthread_stop+0x10d/0x900 kernel/kthread.c:545 Write of size 4 at addr 000000000000001c by task syz-executor4/8542 CPU: 1 PID: 8542 Comm: syz-executor4 Not tainted 4.20.0-rc7+ #385 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 audit: type=1326 audit(1545618787.435:35): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 kasan_report_error mm/kasan/report.c:352 [inline] kasan_report.cold.9+0x6d/0x309 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 audit: type=1326 audit(1545618787.435:36): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline] kthread_stop+0x10d/0x900 kernel/kthread.c:545 vivid_stop_generating_vid_cap+0x2bb/0x9ae drivers/media/platform/vivid/vivid-kthread-cap.c:931 vid_cap_stop_streaming+0x8d/0xe0 drivers/media/platform/vivid/vivid-vid-cap.c:259 __vb2_queue_cancel+0x14f/0xd50 drivers/media/common/videobuf2/videobuf2-core.c:1843 vb2_core_streamoff+0x60/0x140 drivers/media/common/videobuf2/videobuf2-core.c:2006 audit: type=1326 audit(1545618787.435:37): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 __vb2_cleanup_fileio+0x73/0x160 drivers/media/common/videobuf2/videobuf2-core.c:2527 vb2_core_queue_release+0x1e/0x80 drivers/media/common/videobuf2/videobuf2-core.c:2254 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:842 [inline] _vb2_fop_release+0x1d2/0x2b0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1015 vb2_fop_release+0x77/0xc0 drivers/media/common/videobuf2/videobuf2-v4l2.c:1029 vivid_fop_release+0x18e/0x440 drivers/media/platform/vivid/vivid-core.c:474 v4l2_release+0x224/0x3a0 drivers/media/v4l2-core/v4l2-dev.c:456 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fefc8fa0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fefc8fa16d4 R13: 00000000004f1732 R14: 00000000004cd5b8 R15: 00000000ffffffff ================================================================== audit: type=1326 audit(1545618787.435:38): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 audit: type=1326 audit(1545618787.525:39): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000 audit: type=1326 audit(1545618787.525:40): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=8514 comm="syz-executor1" exe="/root/syz-executor1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x457669 code=0x50000