WARNING in anon_vma_interval_tree_verify (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 670d6552 Linux 4.14.227
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15e6891ad00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b38402558b315f84
dashboard link: https://syzkaller.appspot.com/bug?extid=6347f87121a178d0a847

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+6347f8...@syzkaller.appspotmail.com

FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
------------[ cut here ]------------
WARNING: CPU: 1 PID: 2941 at mm/interval_tree.c:109 anon_vma_interval_tree_verify+0xfd/0x160 mm/interval_tree.c:109
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2941 Comm: syz-executor.0 Not tainted 4.14.227-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x20/0x44 kernel/panic.c:547
report_bug+0x208/0x250 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:177 [inline]
fixup_bug arch/x86/kernel/traps.c:172 [inline]
do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:anon_vma_interval_tree_verify+0xfd/0x160 mm/interval_tree.c:109
RSP: 0018:ffff8880b3107a78 EFLAGS: 00010297
RAX: ffff88809f512540 RBX: ffff888000147540 RCX: 0000000000002ada
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88808f20a0d8
RBP: ffff88808f20a040 R08: ffffffff8b99f190 R09: 0000000000050410
R10: ffff88809f512df0 R11: ffff88809f512540 R12: 00000007ffffffde
R13: 0000000000000000 R14: ffff8880b4f04488 R15: ffff888000147540
validate_mm+0xfe/0x580 mm/mmap.c:361
__vma_adjust+0x967/0x1770 mm/mmap.c:960
vma_merge+0x350/0xc70 mm/mmap.c:1169
mmap_region+0x2f6/0x1220 mm/mmap.c:1675
do_mmap+0x5b3/0xcb0 mm/mmap.c:1495
do_mmap_pgoff include/linux/mm.h:2185 [inline]
vm_mmap_pgoff+0x14e/0x1a0 mm/util.c:333
SYSC_mmap_pgoff mm/mmap.c:1545 [inline]
SyS_mmap_pgoff+0x3c5/0x510 mm/mmap.c:1503
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x4664a2
RSP: 002b:00007ffeeeb5bd58 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000020022 RCX: 00000000004664a2
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffeeeb5bf50
R13: 00007f9cda2b9700 R14: 0000000000000000 R15: 0000000000022000
CPU: 0 PID: 2948 Comm: syz-executor.3 Not tainted 4.14.227-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc mm/slab.c:3376 [inline]
kmem_cache_alloc_trace+0x29a/0x3d0 mm/slab.c:3616
kmalloc include/linux/slab.h:488 [inline]
sock_alloc_inode+0x5f/0x250 net/socket.c:254
alloc_inode+0x5d/0x170 fs/inode.c:210
new_inode_pseudo+0x14/0xe0 fs/inode.c:899
sock_alloc+0x3c/0x270 net/socket.c:569
__sock_create+0x8a/0x620 net/socket.c:1239
sock_create net/socket.c:1315 [inline]
SYSC_socketpair net/socket.c:1387 [inline]
SyS_socketpair+0xdf/0x480 net/socket.c:1366
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007f24929ab188 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
RDX: 0000000000000002 RSI: 0000000000000002 RDI: 000000000000001d
RBP: 00007f24929ab1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd225a357f R14: 00007f24929ab300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.