BUG: unable to handle page fault for address: 0000000400000034
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000010e4df067 P4D 800000010e4df067 PUD 0 
Oops: Oops: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 6718 Comm: syz.1.332 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:kmem_cache_alloc_noprof+0x2e/0x6e0
Code: 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 89 f5 49 89 fe 65 48 8b 05 c1 43 ab 10 48 89 44 24 30 48 8b 44 24 68 48 89 44 24 18 <8b> 47 34 48 89 44 24 08 8b 1d 44 78 ab 0d 21 f3 89 df e8 db 9c fd
RSP: 0018:ffffc900069de4c0 EFLAGS: 00010286
RAX: ffffffff822e7088 RBX: 0000000000012800 RCX: ffff8881077b5700
RDX: 0000000000000002 RSI: 0000000000012800 RDI: 0000000400000000
RBP: 0000000000012800 R08: ffff8881077b5700 R09: 0000000000000002
R10: 00000000fffffff0 R11: 0000000000000002 R12: ffff88801af32960
R13: 1ffff110035e662c R14: 0000000400000000 R15: 0000000000000028
FS:  00007f87fbd4b6c0(0000) GS:ffff8881a39dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000400000034 CR3: 0000000106c38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 zs_malloc+0x88/0x720
 zswap_store+0x1062/0x1f40
 swap_writeout+0x710/0xd70
 shmem_writeout+0xf70/0x1210
 shrink_folio_list+0x2ff0/0x4c70
 reclaim_folio_list+0xeb/0x500
 reclaim_pages+0x454/0x520
 madvise_cold_or_pageout_pte_range+0x1974/0x1d00
 walk_pgd_range+0xfe9/0x1d40
 __walk_page_range+0x14c/0x710
 walk_page_range_vma+0x393/0x440
 madvise_vma_behavior+0x311f/0x3a10
 madvise_walk_vmas+0x51c/0xa30
 madvise_do_behavior+0x38e/0x550
 do_madvise+0x1bc/0x270
 __x64_sys_madvise+0xa7/0xc0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f87faf8ec29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f87fbd4b038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f87fb1d5fa0 RCX: 00007f87faf8ec29
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f87fb011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f87fb1d6038 R14: 00007f87fb1d5fa0 R15: 00007ffe9ace7768
 </TASK>
Modules linked in:
CR2: 0000000400000034
---[ end trace 0000000000000000 ]---
RIP: 0010:kmem_cache_alloc_noprof+0x2e/0x6e0
Code: 55 41 57 41 56 41 55 41 54 53 48 83 ec 38 89 f5 49 89 fe 65 48 8b 05 c1 43 ab 10 48 89 44 24 30 48 8b 44 24 68 48 89 44 24 18 <8b> 47 34 48 89 44 24 08 8b 1d 44 78 ab 0d 21 f3 89 df e8 db 9c fd
RSP: 0018:ffffc900069de4c0 EFLAGS: 00010286
RAX: ffffffff822e7088 RBX: 0000000000012800 RCX: ffff8881077b5700
RDX: 0000000000000002 RSI: 0000000000012800 RDI: 0000000400000000
RBP: 0000000000012800 R08: ffff8881077b5700 R09: 0000000000000002
R10: 00000000fffffff0 R11: 0000000000000002 R12: ffff88801af32960
R13: 1ffff110035e662c R14: 0000000400000000 R15: 0000000000000028
FS:  00007f87fbd4b6c0(0000) GS:ffff8881a39dd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562c4eeee600 CR3: 0000000106c38000 CR4: 00000000000006f0
