general protection fault in unmap_page_range

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=105b1f96b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=28cfbe2c63edec4d3bac
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

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+28cfbe...@syzkaller.appspotmail.com

general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 32242 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unmap_page_range+0xe9/0x2c50 mm/memory.c:1529
Code: e8 03 80 3c 18 00 0f 85 0f 26 00 00 48 8b 44 24 20 48 8b 58 40 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dd 25 00 00 49 be 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffff88820827f770 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 000000001f5e92c0 RCX: ffffffff818b8ca3
RDX: 0000000003ebd262 RSI: ffffffff818b8cb1 RDI: 000000001f5e9310
RBP: ffff88800010e568 R08: 0000000000000000 R09: 00007fbe99e56000
R10: 0000000000000006 R11: 0000000000000000 R12: 00007fbe99e56000
R13: 00007fbe99e56000 R14: 00007fbe9a056000 R15: 00007fbe99e56000
FS: 00007fbe98433700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f528f29d718 CR3: 0000000053f7f000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
unmap_single_vma+0x198/0x300 mm/memory.c:1579
unmap_vmas+0xa9/0x180 mm/memory.c:1609
exit_mmap+0x2b9/0x530 mm/mmap.c:3093
__mmput kernel/fork.c:1016 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1037
exit_mm kernel/exit.c:549 [inline]
do_exit+0xaec/0x2be0 kernel/exit.c:857
do_group_exit+0x125/0x310 kernel/exit.c:967
get_signal+0x3f2/0x1f70 kernel/signal.c:2589
do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799
exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fbe9aedeae9
Code: Bad RIP value.
RSP: 002b:00007fbe98433218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fbe9aff2028 RCX: 00007fbe9aedeae9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fbe9aff202c
RBP: 00007fbe9aff2020 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbe9aff202c
R13: 00007ffcad6574ef R14: 00007fbe98433300 R15: 0000000000022000
Modules linked in:
---[ end trace 9005a4c7b5962b34 ]---
RIP: 0010:unmap_page_range+0xe9/0x2c50 mm/memory.c:1529
Code: e8 03 80 3c 18 00 0f 85 0f 26 00 00 48 8b 44 24 20 48 8b 58 40 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 dd 25 00 00 49 be 00 00 00 00 00 fc ff df 4c 89
RSP: 0018:ffff88820827f770 EFLAGS: 00010202
f2fs_msg: 64 callbacks suppressed
F2FS-fs (loop3): invalid crc value
RAX: dffffc0000000000 RBX: 000000001f5e92c0 RCX: ffffffff818b8ca3
RDX: 0000000003ebd262 RSI: ffffffff818b8cb1 RDI: 000000001f5e9310
RBP: ffff88800010e568 R08: 0000000000000000 R09: 00007fbe99e56000
dccp_v6_rcv: dropped packet with invalid checksum
F2FS-fs (loop5): invalid crc value
F2FS-fs (loop3): Failed to initialize F2FS segment manager
F2FS-fs (loop5): invalid crc value
F2FS-fs (loop5): Failed to get valid F2FS checkpoint
R10: 0000000000000006 R11: 0000000000000000 R12: 00007fbe99e56000
F2FS-fs (loop5): invalid crc value
F2FS-fs (loop5): invalid crc value
F2FS-fs (loop5): Failed to get valid F2FS checkpoint
F2FS-fs (loop3): invalid crc value
F2FS-fs (loop3): Failed to initialize F2FS segment manager
R13: 00007fbe99e56000 R14: 00007fbe9a056000 R15: 00007fbe99e56000
FS: 00007fbe98433700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
audit: type=1804 audit(1636189286.149:533): pid=32289 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir714957059/syzkaller.2iITUX/1295/bus" dev="sda1" ino=15716 res=1
CR2: 0000000020014000 CR3: 000000009e7e6000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
audit: type=1804 audit(1636189286.199:534): pid=32289 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir714957059/syzkaller.2iITUX/1295/bus" dev="sda1" ino=15716 res=1
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 03 80 3c 18 callq 0x183c8008
5: 00 0f add %cl,(%rdi)
7: 85 0f test %ecx,(%rdi)
9: 26 00 00 add %al,%es:(%rax)
c: 48 8b 44 24 20 mov 0x20(%rsp),%rax
11: 48 8b 58 40 mov 0x40(%rax),%rbx
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 8d 7b 50 lea 0x50(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 dd 25 00 00 jne 0x2611
34: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
3b: fc ff df
3e: 4c rex.WR
3f: 89 .byte 0x89


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[syzbot]

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