loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2958 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2958!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 5020 Comm: syz-executor111 Not tainted 6.5.0-rc7-syzkaller-00004-gf7757129e3de #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:dbFindLeaf+0x14e/0x240 fs/jfs/jfs_dmap.c:2958
Code: fe 83 fb 04 75 8c e8 21 74 93 fe 48 c7 c1 80 f8 a9 8a ba 8e 0b 00 00 48 c7 c6 c0 f6 a9 8a 48 c7 c7 00 f7 a9 8a e8 a2 d6 76 fe <0f> 0b e8 fb 73 93 fe 46 8d 34 ad 01 00 00 00 31 ff 83 6c 24 04 01
RSP: 0018:ffffc90003a4f2e8 EFLAGS: 00010282
RAX: 000000000000002b RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff816a0060 RDI: 0000000000000005
RBP: ffff888029b66010 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000014 R14: 0000000000000011 R15: 00000000ffffffff
FS:  0000555556b49380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea0000 CR3: 000000007894f000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 dbAllocDmapLev+0xaa/0x2f0 fs/jfs/jfs_dmap.c:1959
 dbAllocCtl+0x12c/0x7b0 fs/jfs/jfs_dmap.c:1815
 dbAllocAG+0x8c5/0xd20 fs/jfs/jfs_dmap.c:1356
 dbAlloc+0x415/0xaa0 fs/jfs/jfs_dmap.c:880
 extBalloc fs/jfs/jfs_extent.c:321 [inline]
 extAlloc+0x4ed/0xed0 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x428/0xb20 fs/jfs/inode.c:248
 __block_write_begin_int+0x3c0/0x1470 fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2178 [inline]
 block_write_begin+0xb1/0x490 fs/buffer.c:2239
 jfs_write_begin+0x31/0xd0 fs/jfs/inode.c:299
 generic_perform_write+0x278/0x600 mm/filemap.c:3923
 __generic_file_write_iter+0x1f9/0x240 mm/filemap.c:4018
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4044
 call_write_iter include/linux/fs.h:1877 [inline]
 do_iter_readv_writev+0x21e/0x3c0 fs/read_write.c:735
 do_iter_write+0x17f/0x830 fs/read_write.c:860
 vfs_writev+0x221/0x700 fs/read_write.c:933
 do_pwritev+0x1af/0x260 fs/read_write.c:1030
 __do_sys_pwritev2 fs/read_write.c:1089 [inline]
 __se_sys_pwritev2 fs/read_write.c:1080 [inline]
 __x64_sys_pwritev2+0xef/0x150 fs/read_write.c:1080
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd38e32b139
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffff6d023c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007ffff6d025a8 RCX: 00007fd38e32b139
RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007fd38e3a4610 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffff6d02598 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x14e/0x240 fs/jfs/jfs_dmap.c:2958
Code: fe 83 fb 04 75 8c e8 21 74 93 fe 48 c7 c1 80 f8 a9 8a ba 8e 0b 00 00 48 c7 c6 c0 f6 a9 8a 48 c7 c7 00 f7 a9 8a e8 a2 d6 76 fe <0f> 0b e8 fb 73 93 fe 46 8d 34 ad 01 00 00 00 31 ff 83 6c 24 04 01
RSP: 0018:ffffc90003a4f2e8 EFLAGS: 00010282
RAX: 000000000000002b RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff816a0060 RDI: 0000000000000005
RBP: ffff888029b66010 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000014 R14: 0000000000000011 R15: 00000000ffffffff
FS:  0000555556b49380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020ea0000 CR3: 000000007894f000 CR4: 0000000000350ee0