loop2: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:3017 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3017!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 15058 Comm: syz-executor.2 Not tainted 5.15.120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:3017
lr : dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:3017
sp : ffff80001e6d6e70
x29: ffff80001e6d6e80 x28: 0000000000000012 x27: dfff800000000000
x26: 00000000ffffffff x25: 0000000000000014 x24: ffff800014e3fb10
x23: 0000000000000011 x22: 0000000000000003 x21: 0000000000000000
x20: ffff0000c791a010 x19: ffff80001e6d6f20 x18: 0000000000000001
x17: ff80800008335ea8 x16: ffff80001195b9f4 x15: ffff800008335ea8
x14: 00000000ffffffff x13: ffffffffffffffff x12: 0000000000040000
x11: 000000000003ffff x10: ffff80001fdca000 x9 : 8d77c9f640579500
x8 : 8d77c9f640579500 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001e6d65d8 x4 : ffff8000149cfca0 x3 : ffff80000a954f60
x2 : ffff0001b4819d10 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x3e0/0x3e4 fs/jfs/jfs_dmap.c:3017
 dbAllocDmapLev+0xc4/0x3b8 fs/jfs/jfs_dmap.c:2021
 dbAllocCtl+0x104/0x874 fs/jfs/jfs_dmap.c:1877
 dbAllocAG+0x208/0xe4c fs/jfs/jfs_dmap.c:1418
 dbAlloc+0x4b0/0xa18 fs/jfs/jfs_dmap.c:874
 extBalloc fs/jfs/jfs_extent.c:518 [inline]
 extAlloc+0x3f0/0xe38 fs/jfs/jfs_extent.c:125
 jfs_get_block+0x34c/0xbfc fs/jfs/inode.c:258
 nobh_write_begin+0x2d8/0xa28 fs/buffer.c:2650
 jfs_write_begin+0x58/0xa0 fs/jfs/inode.c:322
 generic_perform_write+0x24c/0x520 mm/filemap.c:3776
 __generic_file_write_iter+0x230/0x454 mm/filemap.c:3903
 generic_file_write_iter+0xb4/0x1b8 mm/filemap.c:3935
 do_iter_readv_writev+0x420/0x5f8
 do_iter_write+0x1b8/0x664 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x1ec/0x334 fs/read_write.c:1025
 __do_sys_pwritev2 fs/read_write.c:1084 [inline]
 __se_sys_pwritev2 fs/read_write.c:1075 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d0042a03 91028063 52817922 959a070d (d4210000) 
---[ end trace 4af28d0347c3c12d ]---