bcachefs (loop1): error validating btree node on loop1 at btree lru level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 28f61e078e70b95c written 16 min_key POS_MIN durability: 1 ptr: 0:28:0 gen 0  
  node offset 0/16 bset u64s 0: unknown checksum type 4, fixing
Unable to handle kernel paging request at virtual address dfff800000000004
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000004] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6551 Comm: syz.1.14 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : crypto_skcipher_alg include/crypto/skcipher.h:375 [inline]
pc : crypto_skcipher_encrypt+0x48/0x124 crypto/skcipher.c:637
lr : crypto_skcipher_encrypt+0x24/0x124 crypto/skcipher.c:635
sp : ffff80009ef158f0
x29: ffff80009ef158f0 x28: ffff80009ef160e0 x27: ffff80009ef160e8
x26: 0000000000000020 x25: ffff700013de2b3c x24: 8e70b95c00000000
x23: 0000000000000008 x22: ffff80009ef160e8 x21: dfff800000000000
x20: 0000000000000008 x19: ffff80009ef15a20 x18: ffff80009ef15c60
x17: 0000000000000000 x16: ffff80008b3edfc8 x15: 0000000000000002
x14: 1ffff00013de2b4a x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 000000000007ffff x9 : ffff8000a49fa000
x8 : 0000000000000004 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000010
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000020
Call trace:
 crypto_skcipher_alg include/crypto/skcipher.h:375 [inline] (P)
 crypto_skcipher_encrypt+0x48/0x124 crypto/skcipher.c:637 (P)
 crypto_skcipher_encrypt+0x24/0x124 crypto/skcipher.c:635 (L)
 do_encrypt_sg fs/bcachefs/checksum.c:108 [inline]
 do_encrypt+0x8d8/0xa80 fs/bcachefs/checksum.c:158
 gen_poly_key fs/bcachefs/checksum.c:200 [inline]
 bch2_checksum+0x1c0/0x784 fs/bcachefs/checksum.c:236
 bch2_btree_node_read_done+0x127c/0x4b78 fs/bcachefs/btree_io.c:1056
 btree_node_read_work+0x50c/0xe08 fs/bcachefs/btree_io.c:1323
 bch2_btree_node_read+0x1f3c/0x27f8 fs/bcachefs/btree_io.c:1708
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1749 [inline]
 bch2_btree_root_read+0x2b0/0x40c fs/bcachefs/btree_io.c:1771
 read_btree_roots+0x24c/0x794 fs/bcachefs/recovery.c:523
 bch2_fs_recovery+0x328c/0x55dc fs/bcachefs/recovery.c:853
 bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037
 bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2170
 vfs_get_tree+0x90/0x28c fs/super.c:1814
 do_new_mount+0x278/0x900 fs/namespace.c:3507
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount fs/namespace.c:4034 [inline]
 __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 9775c95b f9400294 91006280 d343fc08 (38756908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9775c95b 	bl	0xfffffffffdd7256c
   4:	f9400294 	ldr	x20, [x20]
   8:	91006280 	add	x0, x20, #0x18
   c:	d343fc08 	lsr	x8, x0, #3
* 10:	38756908 	ldrb	w8, [x8, x21] <-- trapping instruction