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Subject[syzbot] general protection fault in vma_interval_tree_remove
From
Hello,

syzbot found the following issue on:

HEAD commit: bdc61aad77fa Add linux-next specific files for 20220428
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1196c4bcf00000
kernel config: https://syzkaller.appspot.com/x/.config?x=87767e89da13a759
dashboard link: https://syzkaller.appspot.com/bug?extid=ee1fdd8dcc770a3a169a
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ee1fdd8dcc770a3a169a@syzkaller.appspotmail.com

RBP: 0000000020000000 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020000800
R13: 0000000020000000 R14: 00000000200007c0 R15: 0000000020000000
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 32272 Comm: syz-executor.4 Not tainted 5.18.0-rc4-next-20220428-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rb_set_parent_color include/linux/rbtree_augmented.h:165 [inline]
RIP: 0010:____rb_erase_color lib/rbtree.c:359 [inline]
RIP: 0010:__rb_erase_color+0x2fd/0xdb0 lib/rbtree.c:413
Code: 00 4d 89 ec 4d 8b 6d 10 e9 ac fd ff ff 4c 89 60 10 eb be 4c 89 e9 48 89 e8 4c 89 6d 10 48 c1 e9 03 49 89 6c 24 08 48 83 c8 01 <80> 3c 19 00 0f 85 1d 08 00 00 49 89 45 00 48 89 e8 48 c1 e8 03 80
RSP: 0018:ffffc900149ffa48 EFLAGS: 00010286
RAX: ffff88801f3fbb21 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffed1002fe1617 RSI: ffff888017f0b0b8 RDI: ffff8880790928a0
RBP: ffff88801f3fbb20 R08: ffff88801f3fbb30 R09: ffff888017f0b0af
R10: ffffffff81b01168 R11: 0000000000000001 R12: ffff888079092898
R13: 0000000000000000 R14: ffff888017f0b0b8 R15: ffffffff81afff50
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001da88000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
rb_erase_augmented include/linux/rbtree_augmented.h:305 [inline]
rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline]
vma_interval_tree_remove+0x694/0xed0 mm/interval_tree.c:23
__remove_shared_vm_struct mm/mmap.c:160 [inline]
unlink_file_vma+0xbd/0x110 mm/mmap.c:175
free_pgtables+0x255/0x420 mm/memory.c:440
exit_mmap+0x1ff/0x740 mm/mmap.c:3148
__mmput+0xe4/0x460 kernel/fork.c:1175
mmput+0x5c/0x70 kernel/fork.c:1197
exit_mm kernel/exit.c:510 [inline]
do_exit+0xa18/0x2a00 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+0x44/0xae
RIP: 0033:0x7f858fe890e9
Code: Unable to access opcode bytes at RIP 0x7f858fe890bf.
RSP: 002b:00007f85910bbaf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f858fe890e9
RDX: 00007f858fe89132 RSI: 0000000000000000 RDI: 000000000000000b
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000020000800
R13: 0000000020000000 R14: 00000000200007c0 R15: 0000000020000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rb_set_parent_color include/linux/rbtree_augmented.h:165 [inline]
RIP: 0010:____rb_erase_color lib/rbtree.c:359 [inline]
RIP: 0010:__rb_erase_color+0x2fd/0xdb0 lib/rbtree.c:413
Code: 00 4d 89 ec 4d 8b 6d 10 e9 ac fd ff ff 4c 89 60 10 eb be 4c 89 e9 48 89 e8 4c 89 6d 10 48 c1 e9 03 49 89 6c 24 08 48 83 c8 01 <80> 3c 19 00 0f 85 1d 08 00 00 49 89 45 00 48 89 e8 48 c1 e8 03 80
RSP: 0018:ffffc900149ffa48 EFLAGS: 00010286
RAX: ffff88801f3fbb21 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffed1002fe1617 RSI: ffff888017f0b0b8 RDI: ffff8880790928a0
RBP: ffff88801f3fbb20 R08: ffff88801f3fbb30 R09: ffff888017f0b0af
R10: ffffffff81b01168 R11: 0000000000000001 R12: ffff888079092898
R13: 0000000000000000 R14: ffff888017f0b0b8 R15: ffffffff81afff50
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001da88000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 4d 89 add %cl,-0x77(%rbp)
3: ec in (%dx),%al
4: 4d 8b 6d 10 mov 0x10(%r13),%r13
8: e9 ac fd ff ff jmpq 0xfffffdb9
d: 4c 89 60 10 mov %r12,0x10(%rax)
11: eb be jmp 0xffffffd1
13: 4c 89 e9 mov %r13,%rcx
16: 48 89 e8 mov %rbp,%rax
19: 4c 89 6d 10 mov %r13,0x10(%rbp)
1d: 48 c1 e9 03 shr $0x3,%rcx
21: 49 89 6c 24 08 mov %rbp,0x8(%r12)
26: 48 83 c8 01 or $0x1,%rax
* 2a: 80 3c 19 00 cmpb $0x0,(%rcx,%rbx,1) <-- trapping instruction
2e: 0f 85 1d 08 00 00 jne 0x851
34: 49 89 45 00 mov %rax,0x0(%r13)
38: 48 89 e8 mov %rbp,%rax
3b: 48 c1 e8 03 shr $0x3,%rax
3f: 80 .byte 0x80


---
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.

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