ret_from_fork+0x675/0x7d0 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
kernel BUG at mm/filemap.c:870!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 16605 Comm: syz.0.2282 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:870
Code: 53 c7 ff 48 c7 c6 a0 6e 99 8b 4c 89 ef e8 bd 6b 11 00 90 0f 0b e8 f5 52 c7 ff 48 c7 c6 00 6f 99 8b 4c 89 ef e8 a6 6b 11 00 90 <0f> 0b e8 de 52 c7 ff 90 0f 0b 90 e9 f2 fb ff ff e8 d0 52 c7 ff 48
RSP: 0018:ffffc900044377e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880239da480 RSI: ffffffff81f5b76a RDI: ffff8880239da904
RBP: 0000000000112c00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9081f6d7 R11: 0000000000000002 R12: 0000000000000002
R13: ffffea0001400440 R14: 0000000000000000 R15: 1ffff92000886f27
FS:  0000555556c57500(0000) GS:ffff8880d6a0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b1602fe9c CR3: 0000000031d0e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000002800
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 filemap_add_folio+0x19a/0x610 mm/filemap.c:978
 ra_alloc_folio mm/readahead.c:453 [inline]
 page_cache_ra_order+0x635/0xf20 mm/readahead.c:512
 do_sync_mmap_readahead mm/filemap.c:3340 [inline]
 filemap_fault+0x1583/0x29a0 mm/filemap.c:3489
 __do_fault+0x10d/0x490 mm/memory.c:5280
 do_shared_fault mm/memory.c:5762 [inline]
 do_fault mm/memory.c:5836 [inline]
 do_pte_missing+0x1a6/0x3ba0 mm/memory.c:4361
 handle_pte_fault mm/memory.c:6177 [inline]
 __handle_mm_fault+0x1556/0x2aa0 mm/memory.c:6318
 handle_mm_fault+0x589/0xd10 mm/memory.c:6487
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x64/0xc0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7fad04f58370
Code: fa 08 73 36 48 83 ea 04 73 e0 83 fa fd 7c 10 8a 0e 74 0a 0f b7 74 16 02 66 89 74 17 02 88 0f c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 <c5> fa 7f 07 c5 fa 7f 4c 17 f0 c3 0f 1f 44 00 00 48 8b 4c 16 f8 48
RSP: 002b:00007ffc7fa83cf8 EFLAGS: 00010206
RAX: 0000200000000000 RBX: 0000000000000004 RCX: 8000000000000013
RDX: 0000000000000013 RSI: 0000001b2f3203cf RDI: 0000200000000000
RBP: 00007fad051e7da0 R08: 0000001b2f720000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 00007fad051e618c
R13: 00007ffc7fa83df0 R14: fffffffffffffffe R15: 00007ffc7fa83e10
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__filemap_add_folio+0xf5b/0x11e0 mm/filemap.c:870
Code: 53 c7 ff 48 c7 c6 a0 6e 99 8b 4c 89 ef e8 bd 6b 11 00 90 0f 0b e8 f5 52 c7 ff 48 c7 c6 00 6f 99 8b 4c 89 ef e8 a6 6b 11 00 90 <0f> 0b e8 de 52 c7 ff 90 0f 0b 90 e9 f2 fb ff ff e8 d0 52 c7 ff 48
RSP: 0018:ffffc900044377e8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880239da480 RSI: ffffffff81f5b76a RDI: ffff8880239da904
RBP: 0000000000112c00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff9081f6d7 R11: 0000000000000002 R12: 0000000000000002
R13: ffffea0001400440 R14: 0000000000000000 R15: 1ffff92000886f27
FS:  0000555556c57500(0000) GS:ffff8880d6b0a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f89cf917d60 CR3: 0000000031d0e000 CR4: 0000000000352ef0