PANIC: double fault in exc_page_fault

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 1590a2e1 Merge tag 'acpi-5.8-rc3' of git://git.kernel.org/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11eca06b100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf3aec367b9ab569
dashboard link: https://syzkaller.appspot.com/bug?extid=1dec3800cb8c6ff3865b
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [and...@fb.com a...@kernel.org b...@vger.kernel.org dan...@iogearbox.net je...@kernel.org john.fa...@gmail.com ka...@fb.com kps...@chromium.org linux-...@vger.kernel.org net...@vger.kernel.org songliu...@fb.com y...@fb.com]

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1dec38...@syzkaller.appspotmail.com

traps: PANIC: double fault, error_code: 0x0
double fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 348 Comm: kworker/u4:6 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:read_cr2 arch/x86/include/asm/paravirt.h:125 [inline]
RIP: 0010:exc_page_fault+0x14/0x14c0 arch/x86/mm/fault.c:1379
Code: f9 e8 00 1e ce f9 48 c7 c7 80 a4 48 88 e8 59 16 60 f9 cc cc cc cc 41 57 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 48 83 ec 48 <e8> 37 d0 8e f9 48 c7 c0 98 b5 b4 89 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc8ffffffffb8 EFLAGS: 00010096
RAX: 0000000088000e87 RBX: 0000000000000000 RCX: ffffffff88000e87
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffc90000000038
RBP: ffffc90000000038 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc8ffffffffa8 CR3: 00000000a6a68000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900000000e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc900000003c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900000003e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc900000006c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900000006e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc900000009c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900000009e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc90000000cc0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90000000ce0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc90000000fc0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc90000000fe0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc900000012c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
__bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
do_user_addr_fault arch/x86/mm/fault.c:1242 [inline]
handle_page_fault arch/x86/mm/fault.c:1365 [inline]
exc_page_fault+0x946/0x14c0 arch/x86/mm/fault.c:1418
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565
RIP: 0010:preempt_schedule_thunk+0x0/0x18 arch/x86/entry/thunk_64.S:40
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900000012e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffc900000015c0 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff83960b9b RDI: 0000000000000001
RBP: ffffffff810078f7 R08: ffffffff83acebd0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000000e R14: 0000000000000002 R15: 0000000000000000
search_module_extables+0xce/0x100 kernel/module.c:4422
search_exception_tables+0x42/0x50 kernel/extable.c:59
fixup_exception+0x4b/0xca arch/x86/mm/extable.c:161
no_context+0xe7/0x9f0 arch/x86/mm/fault.c:599
Lost 894 message(s)!
---[ end trace 33ba18942a0d2d60 ]---
RIP: 0010:read_cr2 arch/x86/include/asm/paravirt.h:125 [inline]
RIP: 0010:exc_page_fault+0x14/0x14c0 arch/x86/mm/fault.c:1379
Code: f9 e8 00 1e ce f9 48 c7 c7 80 a4 48 88 e8 59 16 60 f9 cc cc cc cc 41 57 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 48 83 ec 48 <e8> 37 d0 8e f9 48 c7 c0 98 b5 b4 89 48 ba 00 00 00 00 00 fc ff df
RSP: 0018:ffffc8ffffffffb8 EFLAGS: 00010096
RAX: 0000000088000e87 RBX: 0000000000000000 RCX: ffffffff88000e87
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffc90000000038
RBP: ffffc90000000038 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc8ffffffffa8 CR3: 00000000a6a68000 CR4: 00000000001426f0
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.