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Date: Tue, 12 Dec 2017 09:03:01 -0800 From: syzbot <bot+2ae755141b3df39bc92fbca1cb7272b7de1334b5@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, dhowells@...hat.com, hannes@...xchg.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com, mingo@...nel.org, syzkaller-bugs@...glegroups.com, vbabka@...e.cz Subject: general protection fault in page_mapping Hello, syzkaller hit the following crash on 82bcf1def3b5f1251177ad47c44f7e17af039b4b git://git.cmpxchg.org/linux-mmots.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. C reproducer is attached syzkaller reproducer is attached. See https://goo.gl/kgGztJ for information about syzkaller reproducers audit: type=1400 audit(1512751226.892:7): avc: denied { map } for pid=3149 comm="syzkaller233597" path="/root/syzkaller233597068" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 3149 Comm: syzkaller233597 Not tainted 4.15.0-rc2-mm1+ #39 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:compound_head include/linux/page-flags.h:147 [inline] RIP: 0010:page_mapping+0xa4/0x530 mm/util.c:475 RSP: 0018:ffff8801c5177320 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff10038a2ee65 RCX: ffffffff81950c5d RDX: 0000000000000000 RSI: 1ffff10038a2ef03 RDI: 0000000000000000 RBP: ffff8801c5177470 R08: ffffed0038a6fbac R09: ffff8801c537dd40 R10: ffff8801d6e8c518 R11: ffffed0038a6fbab R12: 0000000000000000 R13: ffff8801c5177448 R14: dffffc0000000000 R15: 0000000000000020 FS: 00000000021da880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020a23000 CR3: 00000001c6bf5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: set_page_dirty+0xb9/0x5d0 mm/page-writeback.c:2544 rds_atomic_free_op+0xc2/0x330 net/rds/rdma.c:481 rds_message_purge net/rds/message.c:79 [inline] rds_message_put+0x53c/0x6b0 net/rds/message.c:91 rds_sendmsg+0x14ee/0x1f90 net/rds/send.c:1204 sock_sendmsg_nosec net/socket.c:636 [inline] sock_sendmsg+0xca/0x110 net/socket.c:646 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2026 __sys_sendmsg+0xe5/0x210 net/socket.c:2060 SYSC_sendmsg net/socket.c:2071 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2067 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x43fe49 RSP: 002b:00007fffab075338 EFLAGS: 00000217 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe49 RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004017b0 R13: 0000000000401840 R14: 0000000000000000 R15: 0000000000000000 Code: f2 f2 f2 c7 40 14 00 f2 f2 f2 c7 40 18 f2 f2 f2 f2 c7 40 1c 00 f2 f2 f2 c7 40 20 f3 f3 f3 f3 e8 43 29 db ff 4c 89 f8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 41 04 00 00 4d 8d b5 00 ff ff ff 48 ba 00 RIP: __read_once_size include/linux/compiler.h:183 [inline] RSP: ffff8801c5177320 RIP: compound_head include/linux/page-flags.h:147 [inline] RSP: ffff8801c5177320 RIP: page_mapping+0xa4/0x530 mm/util.c:475 RSP: ffff8801c5177320 ---[ end trace f878597b0d0664a0 ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com> syzbot will keep track of this bug report. Once a fix for this bug is merged into any tree, reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body. View attachment "config.txt" of type "text/plain" (126475 bytes) Download attachment "raw.log" of type "application/octet-stream" (6109 bytes) View attachment "repro.txt" of type "text/plain" (974 bytes) Download attachment "repro.c" of type "application/octet-stream" (2841 bytes)
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