Hello, syzbot found the following issue on: HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=16ea4288880000 kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294 dashboard link: https://syzkaller.appspot.com/bug?extid=db491b09f5907cdb5984 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=134606ef080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c83cff080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+db491b09f5907cdb5984@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: null-ptr-deref in atomic_cmpxchg include/linux/atomic/atomic-instrumented.h:503 [inline] BUG: KASAN: null-ptr-deref in page_ref_freeze include/linux/page_ref.h:318 [inline] BUG: KASAN: null-ptr-deref in alloc_buddy_huge_page.isra.0+0x103/0x230 mm/hugetlb.c:1960 Write of size 4 at addr 0000000000000034 by task syz-executor107/3608 CPU: 0 PID: 3608 Comm: syz-executor107 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:102 [inline] atomic_cmpxchg include/linux/atomic/atomic-instrumented.h:503 [inline] page_ref_freeze include/linux/page_ref.h:318 [inline] alloc_buddy_huge_page.isra.0+0x103/0x230 mm/hugetlb.c:1960 alloc_fresh_huge_page+0x395/0x530 mm/hugetlb.c:2013 alloc_surplus_huge_page+0x139/0x2f0 mm/hugetlb.c:2227 alloc_buddy_huge_page_with_mpol mm/hugetlb.c:2304 [inline] alloc_huge_page+0xbf6/0x1180 mm/hugetlb.c:2919 hugetlb_no_page mm/hugetlb.c:5571 [inline] hugetlb_fault+0x1056/0x1e60 mm/hugetlb.c:5796 follow_hugetlb_page+0x3f3/0x1850 mm/hugetlb.c:6291 __get_user_pages+0x2cb/0xf10 mm/gup.c:1146 __get_user_pages_locked mm/gup.c:1378 [inline] __get_user_pages_remote+0x18f/0x830 mm/gup.c:2131 pin_user_pages_remote+0x6c/0xb0 mm/gup.c:3189 process_vm_rw_single_vec mm/process_vm_access.c:105 [inline] process_vm_rw_core.constprop.0+0x43b/0x980 mm/process_vm_access.c:215 process_vm_rw+0x29c/0x300 mm/process_vm_access.c:283 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline] __x64_sys_process_vm_writev+0xdf/0x1b0 mm/process_vm_access.c:298 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff4166016c9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff99de70c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000137 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007ff4166016c9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000e18 RBP: 00007fff99de70e0 R08: 000000000000023a R09: 0000000000000000 R10: 0000000020121000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ================================================================== --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
