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 PTI
CPU: 1 PID: 4023 Comm: syz-executor.4 Not tainted 5.1.0-rc3+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014
RIP: 0010:unlink_anon_vmas+0x5f/0x6a0 mm/rmap.c:385
Code: ea 03 80 3c 02 00 0f 85 40 05 00 00 48 8b 44 24 08 48 8b 68 78 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 8d 5d f0 48 c1 ea 03 <80> 3c 02 00 0f 85 0b 05 00 00 48 39 2c 24 48 8b 45 00 4c 8d 68 f0
RSP: 0018:ffff88806b94f940 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff0 RCX: ffffffffa9b06d8b
RDX: 0000000000000000 RSI: ffff888069289458 RDI: ffff88806c3ba500
RBP: 0000000000000000 R08: ffffed100d6eba8a R09: ffffed100d6eba89
R10: 0000000000000001 R11: ffff88806b75d44f R12: dffffc0000000000
R13: 00007f20ef832000 R14: 0000000000000000 R15: 00007f20ee3f0000
FS:  00007f20ee410700(0000) GS:ffff88806d300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a5803f CR3: 0000000040724005 CR4: 00000000003606e0
Call Trace:
 free_pgtables+0x213/0x330 mm/memory.c:394
 exit_mmap+0x24b/0x460 mm/mmap.c:3139
 __mmput kernel/fork.c:1046 [inline]
 mmput+0x9c/0x310 kernel/fork.c:1067
 exit_mm kernel/exit.c:546 [inline]
 do_exit+0x6f1/0x2ab0 kernel/exit.c:863
 do_group_exit+0xed/0x320 kernel/exit.c:980
 get_signal+0x342/0x15f0 kernel/signal.c:2577
 do_signal+0x92/0x1690 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x13a/0x180 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x246/0x2b0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x463219
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f20ee40fcd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000073bfa8 RCX: 0000000000463219
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000073bfa8
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000073bfac
R13: 0000000000000000 R14: 000000000073bfa0 R15: 00007ffc5f226900
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace aaa7b194a50625e8 ]---
RIP: 0010:unlink_anon_vmas+0x5f/0x6a0 mm/rmap.c:385
Code: ea 03 80 3c 02 00 0f 85 40 05 00 00 48 8b 44 24 08 48 8b 68 78 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 8d 5d f0 48 c1 ea 03 <80> 3c 02 00 0f 85 0b 05 00 00 48 39 2c 24 48 8b 45 00 4c 8d 68 f0
RSP: 0018:ffff88806b94f940 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffffffffffff0 RCX: ffffffffa9b06d8b
RDX: 0000000000000000 RSI: ffff888069289458 RDI: ffff88806c3ba500
RBP: 0000000000000000 R08: ffffed100d6eba8a R09: ffffed100d6eba89
R10: 0000000000000001 R11: ffff88806b75d44f R12: dffffc0000000000
R13: 00007f20ef832000 R14: 0000000000000000 R15: 00007f20ee3f0000
FS:  00007f20ee410700(0000) GS:ffff88806d300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a5803f CR3: 0000000040724005 CR4: 00000000003606e0
