Messages in this thread | | | Date | Mon, 25 Mar 2019 00:58:04 -0700 | Subject | kernel BUG at mm/internal.h:LINE! | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: a5ed1e96 Merge tag 'powerpc-5.1-3' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=117a556d200000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622 dashboard link: https://syzkaller.appspot.com/bug?extid=ce4fa49466985039fb35 compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ce4fa49466985039fb35@syzkaller.appspotmail.com
page:ffffea0002fffa00 count:2 mapcount:1 mapping:ffff8880970929f0 index:0x4e4 ext4_da_aops name:"syz-fuzzer" flags: 0x1fffc0000020016(referenced|uptodate|lru|mappedtodisk) raw: 01fffc0000020016 ffffea0001f82548 ffffea0001ab5388 ffff8880970929f0 raw: 00000000000004e4 0000000000000000 0000000200000000 ffff8880aa204bc0 page dumped because: VM_BUG_ON_PAGE(page_ref_count(page)) page->mem_cgroup:ffff8880aa204bc0 ------------[ cut here ]------------ kernel BUG at mm/internal.h:77! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1046 Comm: kcompactd0 Not tainted 5.1.0-rc1+ #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:set_page_refcounted mm/internal.h:77 [inline] RIP: 0010:set_page_refcounted mm/internal.h:74 [inline] RIP: 0010:split_page+0x1e5/0x250 mm/page_alloc.c:2999 Code: 4c 89 e7 e8 5d 98 0c 00 0f 0b 48 c7 c6 20 09 72 87 4c 89 e7 e8 4c 98 0c 00 0f 0b 48 c7 c6 a0 09 72 87 4c 89 e7 e8 3b 98 0c 00 <0f> 0b 48 c7 c6 c0 08 72 87 4c 89 e7 e8 2a 98 0c 00 0f 0b 4c 89 f7 RSP: 0000:ffff8880a83d77b8 EFLAGS: 00010293 RAX: ffff8880a83c80c0 RBX: ffffea0002fffa34 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8199dda2 RDI: ffffed101507aedb RBP: ffff8880a83d77d8 R08: 0000000000000021 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0002fffa00 R13: dffffc0000000000 R14: ffffea0003000034 R15: ffffea0002fff800 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f161d6cc169 CR3: 0000000095b2c000 CR4: 00000000001426e0 Call Trace: split_map_pages+0x334/0x540 mm/compaction.c:83 isolate_freepages mm/compaction.c:1529 [inline] compaction_alloc+0x14ca/0x2290 mm/compaction.c:1543 unmap_and_move mm/migrate.c:1175 [inline] migrate_pages+0x484/0x2cd0 mm/migrate.c:1426 compact_zone+0x1b56/0x38d0 mm/compaction.c:2174 kcompactd_do_work+0x303/0xaa0 mm/compaction.c:2555 kcompactd+0x247/0x890 mm/compaction.c:2648 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Modules linked in: ---[ end trace c8941b63dcddd106 ]--- RIP: 0010:set_page_refcounted mm/internal.h:77 [inline] RIP: 0010:set_page_refcounted mm/internal.h:74 [inline] RIP: 0010:split_page+0x1e5/0x250 mm/page_alloc.c:2999 Code: 4c 89 e7 e8 5d 98 0c 00 0f 0b 48 c7 c6 20 09 72 87 4c 89 e7 e8 4c 98 0c 00 0f 0b 48 c7 c6 a0 09 72 87 4c 89 e7 e8 3b 98 0c 00 <0f> 0b 48 c7 c6 c0 08 72 87 4c 89 e7 e8 2a 98 0c 00 0f 0b 4c 89 f7 RSP: 0000:ffff8880a83d77b8 EFLAGS: 00010293 RAX: ffff8880a83c80c0 RBX: ffffea0002fffa34 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8199dda2 RDI: ffffed101507aedb RBP: ffff8880a83d77d8 R08: 0000000000000021 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea0002fffa00 R13: dffffc0000000000 R14: ffffea0003000034 R15: ffffea0002fff800 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000422d10 CR3: 0000000095b2c000 CR4: 00000000001426e0
--- 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@googlegroups.com.
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