KASAN: null-ptr-deref Write in kthread_use

Title	Replies (including bot)	Last reply
[PATCH 5.9 000/255] 5.9.9-rc1 review	264 (264)	2020/11/19 12:14
[PATCHSET 0/4] io_uring patches queued up for 5.10	5 (5)	2020/11/03 20:28
KASAN: null-ptr-deref Write in kthread_use_mm	2 (3)	2020/11/02 17:38

================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: null-ptr-deref in atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] BUG: KASAN: null-ptr-deref in mmgrab include/linux/sched/mm.h:36 [inline] BUG: KASAN: null-ptr-deref in kthread_use_mm+0x11c/0x2a0 kernel/kthread.c:1257 Write of size 4 at addr 0000000000000060 by task io_uring-sq/9432 CPU: 1 PID: 9432 Comm: io_uring-sq Not tainted 5.10.0-rc1-next-20201030-syzkaller #0 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+0x107/0x163 lib/dump_stack.c:118 __kasan_report mm/kasan/report.c:549 [inline] kasan_report.cold+0x5/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] mmgrab include/linux/sched/mm.h:36 [inline] kthread_use_mm+0x11c/0x2a0 kernel/kthread.c:1257 __io_sq_thread_acquire_mm fs/io_uring.c:1092 [inline] __io_sq_thread_acquire_mm+0x1c4/0x220 fs/io_uring.c:1085 io_sq_thread_acquire_mm_files.isra.0+0x125/0x180 fs/io_uring.c:1104 io_init_req fs/io_uring.c:6661 [inline] io_submit_sqes+0x89d/0x25f0 fs/io_uring.c:6757 __io_sq_thread fs/io_uring.c:6904 [inline] io_sq_thread+0x462/0x1630 fs/io_uring.c:6971 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 9432 Comm: io_uring-sq Tainted: G B 5.10.0-rc1-next-20201030-syzkaller #0 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+0x107/0x163 lib/dump_stack.c:118 panic+0x306/0x73d kernel/panic.c:231 end_report+0x58/0x5e mm/kasan/report.c:106 __kasan_report mm/kasan/report.c:552 [inline] kasan_report.cold+0xd/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] mmgrab include/linux/sched/mm.h:36 [inline] kthread_use_mm+0x11c/0x2a0 kernel/kthread.c:1257 __io_sq_thread_acquire_mm fs/io_uring.c:1092 [inline] __io_sq_thread_acquire_mm+0x1c4/0x220 fs/io_uring.c:1085 io_sq_thread_acquire_mm_files.isra.0+0x125/0x180 fs/io_uring.c:1104 io_init_req fs/io_uring.c:6661 [inline] io_submit_sqes+0x89d/0x25f0 fs/io_uring.c:6757 __io_sq_thread fs/io_uring.c:6904 [inline] io_sq_thread+0x462/0x1630 fs/io_uring.c:6971 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Kernel Offset: disabled Rebooting in 86400 seconds..

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2020/11/02 05:47	linux-next	4e78c578cb98	8bc4594f	.config	console log	report	syz	C			ci-upstream-linux-next-kasan-gce-root
2020/10/30 21:47	linux-next	4e78c578cb98	a6e3ac3b	.config	console log	report	syz	C			ci-upstream-linux-next-kasan-gce-root

Crashes (2):

Assets (help?)