WARNING in __vunmap (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c37da90e Linux 4.19.143
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14f2ca31900000
kernel config: https://syzkaller.appspot.com/x/.config?x=d162ec57805c4e4d
dashboard link: https://syzkaller.appspot.com/bug?extid=d98704e1f65e44589b68
compiler: gcc (GCC) 10.1.0-syz 20200507

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+d98704...@syzkaller.appspotmail.com

FAT-fs (loop5): Unrecognized mount option "nnonumtail=1" or missing value
Trying to vfree() bad address (000000000c20895f)
overlayfs: missing 'lowerdir'
WARNING: CPU: 1 PID: 9059 at mm/vmalloc.c:1509 __vunmap+0x31a/0x3f0 mm/vmalloc.c:1509
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 9059 Comm: syz-executor.2 Not tainted 4.19.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x61 kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__vunmap+0x31a/0x3f0 mm/vmalloc.c:1509
Code: e9 5d fe ff ff e8 26 5e d1 ff 49 81 ef 00 10 00 00 e9 be fd ff ff e8 15 5e d1 ff 4c 89 e6 48 c7 c7 80 18 93 87 e8 31 54 a5 ff <0f> 0b eb 94 e8 fd 5d d1 ff 4c 89 e6 48 c7 c7 e0 18 93 87 e8 19 54
RSP: 0018:ffff88805139f3b8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000018678 RSI: ffffffff8154d001 RDI: ffffed100a273e69
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001
R13: fffffbfff135d0fe R14: 0000607f5168d5a0 R15: ffffe8ffffd8d5a0
vfree+0x65/0x100 mm/vmalloc.c:1598
ipcomp_free_scratches+0xba/0x140 net/xfrm/xfrm_ipcomp.c:216
ipcomp_free_data net/xfrm/xfrm_ipcomp.c:325 [inline]
ipcomp_init_state+0x768/0xa00 net/xfrm/xfrm_ipcomp.c:377
ipcomp6_init_state+0xc2/0x5b0 net/ipv6/ipcomp6.c:165
__xfrm_init_state+0x555/0xd30 net/xfrm/xfrm_state.c:2314
xfrm_state_construct net/xfrm/xfrm_user.c:626 [inline]
xfrm_add_sa+0x1db2/0x33e4 net/xfrm/xfrm_user.c:683
xfrm_user_rcv_msg+0x411/0x6b0 net/xfrm/xfrm_user.c:2681
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2689
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115
__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160
overlayfs: missing 'lowerdir'
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f13f3ff2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002cf00 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000020000840 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007fff7a879e6f R14: 00007f13f3ff39c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: ad326970 Linux 4.19.152
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16363e78500000
kernel config: https://syzkaller.appspot.com/x/.config?x=19e1d59b1459bb9a

dashboard link: https://syzkaller.appspot.com/bug?extid=d98704e1f65e44589b68
compiler: gcc (GCC) 10.1.0-syz 20200507

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=140f0f9f900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d98704...@syzkaller.appspotmail.com

------------[ cut here ]------------
Trying to vfree() nonexistent vm area (000000004c9d808e)
WARNING: CPU: 0 PID: 31276 at mm/vmalloc.c:1515 __vunmap+0x38d/0x470 mm/vmalloc.c:1515

Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 31276 Comm: syz-executor.5 Not tainted 4.19.152-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]

dump_stack+0x22c/0x33e lib/dump_stack.c:118
panic+0x2ac/0x565 kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541

report_bug+0x262/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]

do_error_trap+0x1e1/0x330 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__vunmap+0x38d/0x470 mm/vmalloc.c:1515
Code: c1 ea 03 80 3c 02 00 0f 85 dd 00 00 00 4c 8b 6d 10 e9 58 fe ff ff e8 f2 b0 ce ff 4c 89 e6 48 c7 c7 00 25 14 88 e8 a9 5c 9f ff <0f> 0b eb ac e8 da b0 ce ff 4c 89 e6 48 c7 c7 a0 24 14 88 e8 91 5c
RSP: 0018:ffff88808bfc73b8 EFLAGS: 00010282

RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000

RDX: 0000000000000000 RSI: ffffffff815b62af RDI: ffffed10117f8e69
RBP: ffff88809e497780 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000000 R12: ffffc90007976000
R13: 0000000000000000 R14: 0000607f51a9f798 R15: ffffe8ffffc9f798
vfree+0x65/0x110 mm/vmalloc.c:1598
ipcomp_free_scratches+0xe9/0x1a0 net/xfrm/xfrm_ipcomp.c:216
ipcomp_free_data net/xfrm/xfrm_ipcomp.c:325 [inline]
ipcomp_init_state+0x4b1/0xa60 net/xfrm/xfrm_ipcomp.c:377
ipcomp4_init_state+0xc2/0x7a0 net/ipv4/ipcomp.c:137
__xfrm_init_state+0x5d5/0xd90 net/xfrm/xfrm_state.c:2346

xfrm_state_construct net/xfrm/xfrm_user.c:626 [inline]
xfrm_add_sa+0x1db2/0x33e4 net/xfrm/xfrm_user.c:683

xfrm_user_rcv_msg+0x43d/0x710 net/xfrm/xfrm_user.c:2681

netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2689
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344

netlink_sendmsg+0x717/0xcc0 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc7/0x130 net/socket.c:632
___sys_sendmsg+0x7bb/0x8f0 net/socket.c:2115

__sys_sendmsg net/socket.c:2153 [inline]
__do_sys_sendmsg net/socket.c:2162 [inline]
__se_sys_sendmsg net/socket.c:2160 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2160

do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007eff00b5dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002e640 RCX: 000000000045de59
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000118c008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfd4
R13: 00007ffc65e9c9bf R14: 00007eff00b5e9c0 R15: 000000000118bfd4