loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2975 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2975!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4460 Comm: syz.0.16 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2975
lr : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2975
sp : ffff800020d37860
x29: ffff800020d37870 x28: 0000000000000008 x27: 0000000000000000
x26: 0000000000000003 x25: 0000000000000005 x24: 0000000000000155
x23: ffff0000c9f40021 x22: 000000000000000a x21: ffff0000c9f40010
x20: 0000000000000005 x19: dfff800000000000 x18: ffff800011aabce0
x17: 0000000000000000 x16: ffff8000082d2374 x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000ff0100
x11: ff0080000830a028 x10: 0000000000000000 x9 : 02eebda3ec7dd600
x8 : 02eebda3ec7dd600 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020d37338 x4 : ffff800015194800 x3 : ffff80000a83eb6c
x2 : ffff00019f6ced10 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2975
 dbAllocDmapLev+0x74/0x36c fs/jfs/jfs_dmap.c:1961
 dbAllocCtl+0x130/0x8d8 fs/jfs/jfs_dmap.c:1817
 dbAllocAG+0x9f0/0xd20 fs/jfs/jfs_dmap.c:1466
 dbDiscardAG+0x1e0/0x66c fs/jfs/jfs_dmap.c:1602
 jfs_ioc_trim+0x3dc/0x5d0 fs/jfs/jfs_discard.c:105
 jfs_ioctl+0x2e4/0x434 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: f0042d63 91300063 528173e2 95ffe742 (d4210000) 
---[ end trace 0000000000000000 ]---