kernel BUG at arch/x86/mm/physaddr.c:LINE! (3)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15068816a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=e5c77f8090a3b96b
dashboard link: https://syzkaller.appspot.com/bug?extid=50a27df2d1cd8ae38609
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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+50a27d...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at arch/x86/mm/physaddr.c:27!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 29308 Comm: kworker/0:0 Not tainted 5.2.0-rc5+ #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events cache_reap
RIP: 0010:__phys_addr+0xb3/0x120 arch/x86/mm/physaddr.c:27
Code: 08 4c 89 e3 31 ff 48 d3 eb 48 89 de e8 f6 00 3e 00 48 85 db 75 0f e8
4c ff 3d 00 4c 89 e0 5b 41 5c 41 5d 5d c3 e8 3d ff 3d 00 <0f> 0b e8 36 ff
3d 00 48 c7 c0 10 50 a7 88 48 ba 00 00 00 00 00 fc
RSP: 0018:ffff88804752fbd8 EFLAGS: 00010093
RAX: ffff888059350600 RBX: 0000000000000000 RCX: ffffffff8132c192
RDX: 0000000000000000 RSI: ffffffff8132c1f3 RDI: 0000000000000006
RBP: ffff88804752fbf0 R08: ffff888059350600 R09: ffffed1008ea5f80
R10: ffffed1008ea5f7f R11: 0000000000000003 R12: 0000778000000000
R13: 0000000080000000 R14: ffff88804dd46c00 R15: ffffea00025de388
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f423000 CR3: 000000009320c000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
virt_to_head_page include/linux/mm.h:729 [inline]
free_block+0xa8/0x250 mm/slab.c:3349
drain_array_locked+0x36/0x90 mm/slab.c:2142
drain_array+0x8c/0xb0 mm/slab.c:3960
cache_reap+0xf4/0x280 mm/slab.c:4001
process_one_work+0x989/0x1790 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x354/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:

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[syzbot]

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