general protection fault in validate_mm

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6b7b0056 Linux 4.19.192
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=140c65add00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf82863248bf693f
dashboard link: https://syzkaller.appspot.com/bug?extid=926e33630117f4f0cabe

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+926e33...@syzkaller.appspotmail.com

batman_adv: batadv0: adding TT local entry ba:0e:72:00:ff:ff to non-existent VLAN 1280
batman_adv: batadv0: adding TT local entry ba:0e:72:00:ff:ff to non-existent VLAN 1280
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 14024 Comm: syz-executor.4 Not tainted 4.19.192-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
RIP: 0010:perf_trace_lock_acquire+0x9d/0x530 include/trace/events/lock.h:13
Code: 04 f1 f1 04 f2 c7 40 08 00 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 8d 46 18 48 89 85 40 ff ff ff 48 c1 e8 03 <80> 3c 10 00 0f 85 4f 03 00 00 49 8b 7d 18 48 c7 c0 80 14 6a 88 48
RSP: 0018:ffff888037a17860 EFLAGS: 00010002
RAX: 0000000000000010 RBX: ffff888096db1828 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000068 RDI: ffffffff89f6d360
RBP: ffff888037a17948 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f6d360
R13: 0000000000000068 R14: 0000000000000001 R15: ffff888037a17920
FS: 0000000002a7b400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33327000 CR3: 0000000090cbc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_lock_acquire include/trace/events/lock.h:13 [inline]
lock_acquire+0x298/0x3c0 kernel/locking/lockdep.c:3907
down_read+0x36/0x80 kernel/locking/rwsem.c:24
anon_vma_lock_read include/linux/rmap.h:130 [inline]
validate_mm+0xd3/0x610 mm/mmap.c:368
__vma_adjust+0xa23/0x17f0 mm/mmap.c:969
vma_merge+0x3d6/0xcf0 mm/mmap.c:1178
mmap_region+0x3d8/0x16b0 mm/mmap.c:1717
do_mmap+0x8e8/0x1080 mm/mmap.c:1530
do_mmap_pgoff include/linux/mm.h:2326 [inline]
vm_mmap_pgoff+0x197/0x200 mm/util.c:357
ksys_mmap_pgoff+0x45f/0x5a0 mm/mmap.c:1580
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x466622
Code: 00 00 00 00 00 0f 1f 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 3b 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 5b 5d c3 0f 1f 00 48 c7 c0 bc ff ff ff 64
RSP: 002b:00007ffc86dbb3e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000020022 RCX: 0000000000466622
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffc86dbb5e0
R13: 00007fc14c51b700 R14: 0000000000000000 R15: 0000000000022000
Modules linked in:
---[ end trace b32a317d2cd943b3 ]---
RIP: 0010:trace_event_get_offsets_lock_acquire include/trace/events/lock.h:13 [inline]
RIP: 0010:perf_trace_lock_acquire+0x9d/0x530 include/trace/events/lock.h:13
Code: 04 f1 f1 04 f2 c7 40 08 00 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 48 8d 46 18 48 89 85 40 ff ff ff 48 c1 e8 03 <80> 3c 10 00 0f 85 4f 03 00 00 49 8b 7d 18 48 c7 c0 80 14 6a 88 48
RSP: 0018:ffff888037a17860 EFLAGS: 00010002
RAX: 0000000000000010 RBX: ffff888096db1828 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000068 RDI: ffffffff89f6d360
RBP: ffff888037a17948 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff89f6d360
R13: 0000000000000068 R14: 0000000000000001 R15: ffff888037a17920
FS: 0000000002a7b400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33327000 CR3: 0000000090cbc000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

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