On Thu, Feb 28, 2019 at 11:32 AM syzbot <syzbot+6f5a9b79b75b66078bf0@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 42fd8df9d1d9 Add linux-next specific files for 20190228 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=179ba9e0c00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c0f38652d28b522f > dashboard link: https://syzkaller.appspot.com/bug?extid=6f5a9b79b75b66078bf0 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12ed6bd0c00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10690c8ac00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+6f5a9b79b75b66078bf0@xxxxxxxxxxxxxxxxxxxxxxxxx +Jens, Eric, Looks similar to: https://groups.google.com/forum/#!msg/syzkaller-bugs/E3v3XQweVBw/6BPrkIYJIgAJ Perhaps the fixing commit is not in the build yet? > BUG: Bad page state in process syz-executor193 pfn:9225a > page:ffffea0002489680 count:0 mapcount:0 mapping:ffff88808652fd80 index:0x81 > shmem_aops > name:"memfd:cgroup2" > flags: 0x1fffc000008000e(referenced|uptodate|dirty|swapbacked) > raw: 01fffc000008000e ffff88809277fac0 ffff88809277fac0 ffff88808652fd80 > raw: 0000000000000081 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: non-NULL mapping > Modules linked in: > CPU: 0 PID: 7659 Comm: syz-executor193 Not tainted 5.0.0-rc8-next-20190228 > #45 > 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+0x172/0x1f0 lib/dump_stack.c:113 > bad_page.cold+0xda/0xff mm/page_alloc.c:586 > free_pages_check_bad+0x142/0x1a0 mm/page_alloc.c:1013 > free_pages_check mm/page_alloc.c:1022 [inline] > free_pages_prepare mm/page_alloc.c:1112 [inline] > free_pcp_prepare mm/page_alloc.c:1137 [inline] > free_unref_page_prepare mm/page_alloc.c:3001 [inline] > free_unref_page_list+0x31d/0xc40 mm/page_alloc.c:3070 > release_pages+0x60d/0x1940 mm/swap.c:794 > pagevec_lru_move_fn+0x218/0x2a0 mm/swap.c:213 > activate_page_drain mm/swap.c:297 [inline] > lru_add_drain_cpu+0x3b1/0x520 mm/swap.c:596 > lru_add_drain+0x20/0x60 mm/swap.c:647 > exit_mmap+0x290/0x530 mm/mmap.c:3134 > __mmput kernel/fork.c:1047 [inline] > mmput+0x15f/0x4c0 kernel/fork.c:1068 > exit_mm kernel/exit.c:546 [inline] > do_exit+0x816/0x2fa0 kernel/exit.c:863 > do_group_exit+0x135/0x370 kernel/exit.c:980 > __do_sys_exit_group kernel/exit.c:991 [inline] > __se_sys_exit_group kernel/exit.c:989 [inline] > __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989 > do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x442a58 > Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 > 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff > ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 > RSP: 002b:00007ffe99e2faf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442a58 > RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 > RBP: 00000000004c2468 R08: 00000000000000e7 R09: ffffffffffffffd0 > R10: 0000000002000005 R11: 0000000000000246 R12: 0000000000000001 > R13: 00000000006d4180 R14: 0000000000000000 R15: 0000000000000000 > > > --- > This bug 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 bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/00000000000024b3aa0582f1cde7%40google.com. > For more options, visit https://groups.google.com/d/optout.
