syzbot has found a reproducer for the following issue on: HEAD commit: 34d1d36073ea Add linux-next specific files for 20220621 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=15a34140080000 kernel config: https://syzkaller.appspot.com/x/.config?x=b24b62d1c051cfc8 dashboard link: https://syzkaller.appspot.com/bug?extid=4d875b4d2e2b60bae9b4 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=14097a3ff00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1466c63ff00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4d875b4d2e2b60bae9b4@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] BUG: KASAN: null-ptr-deref in hugepage_vma_check+0x8e/0x750 mm/huge_memory.c:82 Read of size 8 at addr 00000000000005a8 by task syz-executor405/3606 CPU: 0 PID: 3606 Comm: syz-executor405 Not tainted 5.19.0-rc3-next-20220621-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 kasan_report+0xbe/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 include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hugepage_vma_check+0x8e/0x750 mm/huge_memory.c:82 show_smap+0x1c6/0x470 fs/proc/task_mmu.c:866 traverse.part.0+0xcf/0x5f0 fs/seq_file.c:111 traverse fs/seq_file.c:101 [inline] seq_read_iter+0x90f/0x1280 fs/seq_file.c:195 seq_read+0x337/0x4b0 fs/seq_file.c:162 do_loop_readv_writev fs/read_write.c:763 [inline] do_loop_readv_writev fs/read_write.c:750 [inline] do_iter_read+0x4f8/0x750 fs/read_write.c:805 vfs_readv+0xe5/0x150 fs/read_write.c:923 do_preadv fs/read_write.c:1015 [inline] __do_sys_preadv fs/read_write.c:1065 [inline] __se_sys_preadv fs/read_write.c:1060 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1060 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+0x46/0xb0 RIP: 0033:0x7fcb44a75239 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:00007ffedce269f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcb44a75239 RDX: 0000000000000001 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 00007ffedce26a00 R08: 0000000000000000 R09: 65732f636f72702f R10: 00000000fffffffe R11: 0000000000000246 R12: 00007fcb44a39120 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ==================================================================
