Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 0 UID: 0 PID: 5325 Comm: read_btree_node Not tainted 6.13.0-rc7-syzkaller-00043-g619f0b6fad52 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:crypto_skcipher_alg include/crypto/skcipher.h:375 [inline]
RIP: 0010:crypto_skcipher_encrypt+0x45/0x130 crypto/skcipher.c:637
Code: 19 fd 49 8d 5e 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 59 9b 7f fd 48 8b 1b 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 3f 9b 7f fd 4c 8b 7b 18 48 83 c3 04 48 89
RSP: 0018:ffffc9000d557218 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000000008 RCX: ffff88801aae0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc9000d557b10 R08: ffffc9000d5577bf R09: 0000000000000000
R10: ffffc9000d5577b0 R11: fffff52001aaaef8 R12: dffffc0000000000
R13: 0000000000000070 R14: ffffc9000d557780 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c7e3d2950 CR3: 0000000012534000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_encrypt_sg fs/bcachefs/checksum.c:108 [inline]
 do_encrypt+0x992/0xd70 fs/bcachefs/checksum.c:124
 try_read_btree_node fs/bcachefs/btree_node_scan.c:165 [inline]
 read_btree_nodes_worker+0xac9/0x2220 fs/bcachefs/btree_node_scan.c:242
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:crypto_skcipher_alg include/crypto/skcipher.h:375 [inline]
RIP: 0010:crypto_skcipher_encrypt+0x45/0x130 crypto/skcipher.c:637
Code: 19 fd 49 8d 5e 40 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 59 9b 7f fd 48 8b 1b 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 05 e8 3f 9b 7f fd 4c 8b 7b 18 48 83 c3 04 48 89
RSP: 0018:ffffc9000d557218 EFLAGS: 00010202
RAX: 0000000000000004 RBX: 0000000000000008 RCX: ffff88801aae0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc9000d557b10 R08: ffffc9000d5577bf R09: 0000000000000000
R10: ffffc9000d5577b0 R11: fffff52001aaaef8 R12: dffffc0000000000
R13: 0000000000000070 R14: ffffc9000d557780 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cf456e90b8 CR3: 0000000011816000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	19 fd                	sbb    %edi,%ebp
   2:	49 8d 5e 40          	lea    0x40(%r14),%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 59 9b 7f fd       	call   0xfd7f9b75
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 05                	je     0x36
  31:	e8 3f 9b 7f fd       	call   0xfd7f9b75
  36:	4c 8b 7b 18          	mov    0x18(%rbx),%r15
  3a:	48 83 c3 04          	add    $0x4,%rbx
  3e:	48                   	rex.W
  3f:	89                   	.byte 0x89