loop6: detected capacity change from 0 to 32768
UFO tlock:0xffffc9000293a1b0
BUG at fs/jfs/jfs_txnmgr.c:662 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:662!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 14642 Comm: syz.6.3230 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 97 87 75 fe 48 c7 c7 e0 93 a5 8b 48 c7 c6 d9 8f a5 8b ba 96 02 00 00 48 c7 c1 00 95 a5 8b e8 a8 36 dc fd 90 <0f> 0b e8 70 87 75 fe 48 c7 c7 c0 95 a5 8b e8 94 36 dc fd 48 c7 c7
RSP: 0018:ffffc90005176fe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 573589a40bbf0e00
RDX: ffffc9000c049000 RSI: 0000000000019431 RDI: 0000000000019432
RBP: ffffc90005177108 R08: ffffc90005176d67 R09: 1ffff92000a2edac
R10: dffffc0000000000 R11: fffff52000a2edad R12: 1ffff92000527400
R13: ffffc9000293a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f725abf66c0(0000) GS:ffff888125e1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84b8bcff98 CR3: 000000002f914000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654
 txCommit+0x852/0x5430 fs/jfs/jfs_txnmgr.c:1256
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc3b/0xfb0 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x346/0xab0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145
 block_write_begin+0x8d/0x120 fs/buffer.c:2256
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314
 generic_file_write_iter+0x117/0x550 mm/filemap.c:4457
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f725c98f749
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:00007f725abf6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f725cbe5fa0 RCX: 00007f725c98f749
RDX: 0000000000032600 RSI: 0000200000000000 RDI: 0000000000000008
RBP: 00007f725ca13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f725cbe6038 R14: 00007f725cbe5fa0 R15: 00007ffe342f86f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1b79/0x1cb0 fs/jfs/jfs_txnmgr.c:662
Code: e9 6a f8 ff ff e8 97 87 75 fe 48 c7 c7 e0 93 a5 8b 48 c7 c6 d9 8f a5 8b ba 96 02 00 00 48 c7 c1 00 95 a5 8b e8 a8 36 dc fd 90 <0f> 0b e8 70 87 75 fe 48 c7 c7 c0 95 a5 8b e8 94 36 dc fd 48 c7 c7
RSP: 0018:ffffc90005176fe0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 573589a40bbf0e00
RDX: ffffc9000c049000 RSI: 0000000000019431 RDI: 0000000000019432
RBP: ffffc90005177108 R08: ffffc90005176d67 R09: 1ffff92000a2edac
R10: dffffc0000000000 R11: fffff52000a2edad R12: 1ffff92000527400
R13: ffffc9000293a000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f725abf66c0(0000) GS:ffff888125e1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564497983950 CR3: 000000002f914000 CR4: 0000000000350ef0