------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_journal_iter.c:83!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 6672 Comm: syz.0.17 Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:bch2_journal_keys_peek_max+0x1680/0x1690 fs/bcachefs/btree_journal_iter.c:83
Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 13 55 03 fe 48 8b 1b e9 c2 fe ff ff e8 16 cd 32 07 e8 11 86 a3 fd 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffc90002ff6be0 EFLAGS: 00010293
RAX: ffffffff841c494f RBX: ffffffffffffffff RCX: ffff8880256dda00
RDX: 0000000000000000 RSI: 000000000000003b RDI: ffffffffffffffff
RBP: ffffc90002ff6da0 R08: 00000008ffffffff R09: 2000000000000000
R10: 0000000000000000 R11: 00000001ffffffff R12: ffffc90002ff73b0
R13: dffffc0000000000 R14: 000000000000003b R15: ffff888063500000
FS:  00007faf866416c0(0000) GS:ffff8881260fd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dace5b0288 CR3: 0000000030300000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_journal_peek fs/bcachefs/btree_iter.c:2110 [inline]
 btree_trans_peek_journal+0x259/0x3b0 fs/bcachefs/btree_iter.c:2139
 __bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2276 [inline]
 bch2_btree_iter_peek_max+0x10dc/0x5260 fs/bcachefs/btree_iter.c:2347
 bch2_btree_iter_peek_slot+0xba0/0x1f00 fs/bcachefs/btree_iter.c:2817
 bch2_btree_iter_peek_prev_min+0x265/0x5490 fs/bcachefs/btree_iter.c:2592
 __bch2_resume_logged_op_finsert+0x803/0x2260 fs/bcachefs/io_misc.c:432
 bch2_fcollapse_finsert+0x19b/0x250 fs/bcachefs/io_misc.c:536
 bchfs_fcollapse_finsert+0x378/0x470 fs/bcachefs/fs-io.c:621
 bch2_fallocate_dispatch+0x360/0x4e0 fs/bcachefs/fs-io.c:-1
 vfs_fallocate+0x6a0/0x830 fs/open.c:338
 ksys_fallocate fs/open.c:362 [inline]
 __do_sys_fallocate fs/open.c:367 [inline]
 __se_sys_fallocate fs/open.c:365 [inline]
 __x64_sys_fallocate+0xc0/0x110 fs/open.c:365
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf8578cde9
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:00007faf86641038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007faf859a5fa0 RCX: 00007faf8578cde9
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000004
RBP: 00007faf8580e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000007000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faf859a5fa0 R15: 00007ffc13f71f08
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_journal_keys_peek_max+0x1680/0x1690 fs/bcachefs/btree_journal_iter.c:83
Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 13 55 03 fe 48 8b 1b e9 c2 fe ff ff e8 16 cd 32 07 e8 11 86 a3 fd 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
RSP: 0018:ffffc90002ff6be0 EFLAGS: 00010293
RAX: ffffffff841c494f RBX: ffffffffffffffff RCX: ffff8880256dda00
RDX: 0000000000000000 RSI: 000000000000003b RDI: ffffffffffffffff
RBP: ffffc90002ff6da0 R08: 00000008ffffffff R09: 2000000000000000
R10: 0000000000000000 R11: 00000001ffffffff R12: ffffc90002ff73b0
R13: dffffc0000000000 R14: 000000000000003b R15: ffff888063500000
FS:  00007faf866416c0(0000) GS:ffff8881260fd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055dace5b0288 CR3: 0000000030300000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400