loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2972 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2972!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6566 Comm: syz-executor.0 Not tainted 6.7.0-rc6-syzkaller-00090-gaafe7ad77b91 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x47c/0x480 fs/jfs/jfs_dmap.c:2972
lr : dbFindLeaf+0x47c/0x480 fs/jfs/jfs_dmap.c:2972
sp : ffff800096f86e70
x29: ffff800096f86e80 x28: dfff800000000000 x27: 00000000ffffffff
x26: 0000000000000014 x25: 0000000000000012 x24: 0000000000000011
x23: 0000000000000003 x22: 0000000000000155 x21: 0000000000000000
x20: ffff0000c8747010 x19: ffff800096f86f00 x18: ffff800096f864a0
x17: 0000000000000000 x16: ffff80008a82b138 x15: 0000000000000001
x14: 1ffff00012df0d24 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000001 x10: 0000000000ff0100 x9 : fb506e5c85227900
x8 : fb506e5c85227900 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800096f86778 x4 : ffff80008e5d20c0 x3 : ffff800082b78914
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x47c/0x480 fs/jfs/jfs_dmap.c:2972
 dbAllocDmapLev+0xc8/0x414 fs/jfs/jfs_dmap.c:1967
 dbAllocCtl+0x104/0x840 fs/jfs/jfs_dmap.c:1823
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1364
 dbAlloc+0x520/0xb68 fs/jfs/jfs_dmap.c:888
 extBalloc fs/jfs/jfs_extent.c:326 [inline]
 extAlloc+0x404/0xdec fs/jfs/jfs_extent.c:122
 jfs_get_block+0x340/0xb98 fs/jfs/inode.c:248
 __block_write_begin_int+0x3f0/0x1504 fs/buffer.c:2119
 __block_write_begin fs/buffer.c:2168 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2227
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:299
 generic_perform_write+0x28c/0x588 mm/filemap.c:3918
 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4013
 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:4039
 do_iter_write+0x654/0xa78 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x1ec/0x334 fs/read_write.c:1030
 __do_sys_pwritev2 fs/read_write.c:1089 [inline]
 __se_sys_pwritev2 fs/read_write.c:1080 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1080
 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155
 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595
Code: b0049583 91088063 52817382 9592f818 (d4210000) 
---[ end trace 0000000000000000 ]---