Messages in this thread |  | | Date | Sun, 20 Mar 2022 15:04:18 -0700 | Subject | [syzbot] KASAN: null-ptr-deref Read in __free_pages | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: 56e337f2cf13 Revert "gpio: Revert regression in sysfs-gpio.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17e0a8c5700000 kernel config: https://syzkaller.appspot.com/x/.config?x=d35f9bc6884af6c9 dashboard link: https://syzkaller.appspot.com/bug?extid=d55757faa9b80590767b 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=134e4e91700000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=127bd083700000
Bisection is inconclusive: the issue happens on the oldest tested release.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=138601c5700000 final oops: https://syzkaller.appspot.com/x/report.txt?x=104601c5700000 console output: https://syzkaller.appspot.com/x/log.txt?x=178601c5700000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d55757faa9b80590767b@syzkaller.appspotmail.com
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc794ecea0 R14: 000000000000000d R15: 00007ff328525490 </TASK> ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: null-ptr-deref in page_ref_count include/linux/page_ref.h:67 [inline] BUG: KASAN: null-ptr-deref in put_page_testzero include/linux/mm.h:717 [inline] BUG: KASAN: null-ptr-deref in __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 Read of size 4 at addr 0000000000000034 by task syz-executor168/3599
CPU: 1 PID: 3599 Comm: syz-executor168 Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #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 mm/kasan/report.c:446 [inline] kasan_report.cold+0x66/0xdf mm/kasan/report.c:459 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] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] page_ref_count include/linux/page_ref.h:67 [inline] put_page_testzero include/linux/mm.h:717 [inline] __free_pages+0x1f/0x1b0 mm/page_alloc.c:5473 watch_queue_set_size+0x499/0x630 kernel/watch_queue.c:275 pipe_ioctl+0xac/0x2b0 fs/pipe.c:632 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 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+0x44/0xae RIP: 0033:0x7ff3284b2d59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 18 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc794ece38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000031 RCX: 00007ff3284b2d59 RDX: 0000000000000029 RSI: 0000000000005760 RDI: 0000000000000003 RBP: 00007ffc794ece40 R08: 0000000000000001 R09: 00007ffc794e0035 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc794ecea0 R14: 000000000000000d R15: 00007ff328525490 </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@googlegroups.com.
syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
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