Messages in this thread | | | Date | Mon, 18 Jul 2022 00:45:38 -0700 | Subject | [syzbot] WARNING in page_counter_cancel (4) | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: cb71b93c2dc3 Add linux-next specific files for 20220628 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=15583826080000 kernel config: https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb dashboard link: https://syzkaller.appspot.com/bug?extid=28eb226ee1d37f08087a 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=12222b9a080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1560ab8c080000
The issue was bisected to:
commit 2ee236fe53a8e2ab54679c74e8a1fb77e55b29bb Author: Liam R. Howlett <Liam.Howlett@Oracle.com> Date: Tue Jun 21 20:46:53 2022 +0000
mm: start tracking VMAs with maple tree
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10b5b252080000 final oops: https://syzkaller.appspot.com/x/report.txt?x=12b5b252080000 console output: https://syzkaller.appspot.com/x/log.txt?x=14b5b252080000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+28eb226ee1d37f08087a@syzkaller.appspotmail.com Fixes: 2ee236fe53a8 ("mm: start tracking VMAs with maple tree")
------------[ cut here ]------------ page_counter underflow: -512 nr_pages=1536 WARNING: CPU: 0 PID: 3608 at mm/page_counter.c:56 page_counter_cancel+0xcf/0xe0 mm/page_counter.c:56 Modules linked in: CPU: 0 PID: 3608 Comm: syz-executor428 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 RIP: 0010:page_counter_cancel+0xcf/0xe0 mm/page_counter.c:56 Code: c7 04 24 00 00 00 00 45 31 f6 eb 97 e8 2a 36 ae ff 4c 89 ea 48 89 ee 48 c7 c7 a0 55 da 89 c6 05 26 90 db 0b 01 e8 bb bb 67 07 <0f> 0b eb a8 4c 89 e7 e8 65 3b fa ff eb c7 0f 1f 00 41 56 41 55 49 RSP: 0018:ffffc9000302fb28 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff888140159268 RCX: 0000000000000000 RDX: ffff88801ea81d40 RSI: ffffffff81610608 RDI: fffff52000605f57 RBP: fffffffffffffe00 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: ffff888140159268 R13: 0000000000000600 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb2ef03c290 CR3: 000000002234d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> page_counter_uncharge+0x2e/0x60 mm/page_counter.c:159 hugetlb_cgroup_uncharge_counter+0xcc/0x3d0 mm/hugetlb_cgroup.c:432 hugetlb_vm_op_close+0x424/0x6b0 mm/hugetlb.c:4598 remove_vma+0x81/0x130 mm/mmap.c:187 exit_mmap+0x288/0x720 mm/mmap.c:3222 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exit_mm kernel/exit.c:510 [inline] do_exit+0xa09/0x29f0 kernel/exit.c:782 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934 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: 0033:0x7fb2eefc6d39 Code: Unable to access opcode bytes at RIP 0x7fb2eefc6d0f. RSP: 002b:00007ffc35614978 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fb2ef03b3f0 RCX: 00007fb2eefc6d39 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000003 R10: 0000000020000000 R11: 0000000000000246 R12: 00007fb2ef03b3f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 </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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