Hello, syzbot found the following issue on: HEAD commit: d01f2f7e Add linux-next specific files for 20210226 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=108dc5a8d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a1746d2802a82a05 dashboard link: https://syzkaller.appspot.com/bug?extid=be51ca5a4d97f017cd50 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+be51ca5a4d97f017cd50@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== 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 io_uring_cancel_sqpoll+0x2c7/0x450 fs/io_uring.c:8871 Write of size 4 at addr 0000000000000110 by task iou-sqp-19439/19447 CPU: 0 PID: 19447 Comm: iou-sqp-19439 Not tainted 5.11.0-next-20210226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 __kasan_report mm/kasan/report.c:403 [inline] kasan_report.cold+0x5f/0xd8 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] io_uring_cancel_sqpoll+0x2c7/0x450 fs/io_uring.c:8871 io_sq_thread+0x1109/0x1ae0 fs/io_uring.c:6782 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 ================================================================== Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 19447 Comm: iou-sqp-19439 Tainted: G B 5.11.0-next-20210226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 panic+0x306/0x73d kernel/panic.c:231 end_report mm/kasan/report.c:102 [inline] end_report.cold+0x5a/0x5a mm/kasan/report.c:88 __kasan_report mm/kasan/report.c:406 [inline] kasan_report.cold+0x6a/0xd8 mm/kasan/report.c:416 check_region_inline mm/kasan/generic.c:180 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_inc include/asm-generic/atomic-instrumented.h:240 [inline] io_uring_cancel_sqpoll+0x2c7/0x450 fs/io_uring.c:8871 io_sq_thread+0x1109/0x1ae0 fs/io_uring.c:6782 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Kernel Offset: disabled Rebooting in 86400 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
