bcachefs (loop6): going read-write
bcachefs (loop6): insufficient writeable journal devices available: have 0, need 1
rw journal devs: loop6
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7615 at fs/bcachefs/btree_iter.c:3194 __bch2_trans_kmalloc+0x50f/0x9d0
Modules linked in:
CPU: 0 UID: 0 PID: 7615 Comm: syz.6.323 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:__bch2_trans_kmalloc+0x50f/0x9d0
Code: 00 28 00 00 e8 d2 5b 35 00 48 c7 c0 75 f7 ff ff 48 83 c4 48 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 e2 53 96 fd 90 <0f> 0b 90 e9 d3 fb ff ff e8 d4 53 96 fd 90 0f 0b 90 e9 dc fd ff ff
RSP: 0018:ffffc90002ece630 EFLAGS: 00010246
RAX: ffffffff84295afe RBX: ffff8880436f0000 RCX: 0000000000080000
RDX: ffffc90007dc9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000020000 R08: ffffc90002ecea30 R09: 0000000000000001
R10: ffffc90002ece940 R11: fffff520005d9cf5 R12: dffffc0000000000
R13: ffff8880436f0030 R14: 1ffff110086de000 R15: 0000000000000011
FS:  00007f4c7d5776c0(0000) GS:ffff8880b8615000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd9732acd58 CR3: 0000000028a96000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 bch2_alloc_sectors_start_trans+0x1d59/0x1e80
 bch2_btree_reserve_get+0x641/0x1810
 bch2_btree_update_start+0x18ff/0x1de0
 bch2_btree_node_rewrite+0x17e/0x1120
 bch2_move_btree+0x6f0/0xc60
 bch2_scan_old_btree_nodes+0x95/0x240
 bch2_fs_recovery+0x3556/0x3a50
 bch2_fs_start+0xaaf/0xda0
 bch2_fs_get_tree+0xb39/0x1520
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4c7c79034a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f4c7d576e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4c7d576ef0 RCX: 00007f4c7c79034a
RDX: 00002000000058c0 RSI: 0000200000000000 RDI: 00007f4c7d576eb0
RBP: 00002000000058c0 R08: 00007f4c7d576ef0 R09: 0000000000000013
R10: 0000000000000013 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f4c7d576eb0 R14: 0000000000005921 R15: 0000200000000040
 </TASK>
