loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2933 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2933!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3058 Comm: syz-executor136 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf fs/jfs/jfs_dmap.c:2933 [inline]
pc : dbAllocDmapLev+0x368/0x3e4 fs/jfs/jfs_dmap.c:1937
lr : dbFindLeaf fs/jfs/jfs_dmap.c:2933 [inline]
lr : dbAllocDmapLev+0x368/0x3e4 fs/jfs/jfs_dmap.c:1937
sp : ffff80000fff3740
x29: ffff80000fff3750 x28: ffff0000cb60f010 x27: 000000000000001c
x26: 00000000ffffffff x25: 00000000001cb702 x24: 0000000000000000
x23: 0000000000000057 x22: ffff0000ca8f5800 x21: ffff0000cb60f000
x20: 0000000000000019 x19: 0000000000000019 x18: 00000000000000c0
x17: ffff80000dd0b198 x16: ffff80000db49158 x15: ffff0000c3d4b500
x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c3d4b500
x11: ff808000081c0d5c x10: 0000000000000000 x9 : 1594543305460200
x8 : 1594543305460200 x7 : ffff80000819545c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff0001fefbecd0 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf fs/jfs/jfs_dmap.c:2933 [inline]
 dbAllocDmapLev+0x368/0x3e4 fs/jfs/jfs_dmap.c:1937
 dbAlloc+0x554/0x694 fs/jfs/jfs_dmap.c:825
 extBalloc+0xd0/0x368 fs/jfs/jfs_extent.c:321
 extAlloc+0x16c/0x384 fs/jfs/jfs_extent.c:122
 jfs_get_block+0x1b4/0x3ec fs/jfs/inode.c:248
 __block_write_begin_int+0x240/0x95c fs/buffer.c:2006
 __block_write_begin fs/buffer.c:2056 [inline]
 block_write_begin+0x74/0x14c fs/buffer.c:2117
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:304
 generic_perform_write+0xf0/0x2cc mm/filemap.c:3738
 __generic_file_write_iter+0xd8/0x21c mm/filemap.c:3866
 generic_file_write_iter+0x6c/0x168 mm/filemap.c:3898
 do_iter_write+0x318/0x560 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_writev+0x12c/0x234 fs/read_write.c:971
 __do_sys_writev fs/read_write.c:1044 [inline]
 __se_sys_writev fs/read_write.c:1041 [inline]
 __arm64_sys_writev+0x28/0x38 fs/read_write.c:1041
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581
Code: 9104a821 91156463 52816ea2 94c99860 (d4210000) 
---[ end trace 0000000000000000 ]---