loop2: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2983 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2983!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 5040 Comm: syz.2.157 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x488/0x48c fs/jfs/jfs_dmap.c:2983
lr : dbFindLeaf+0x488/0x48c fs/jfs/jfs_dmap.c:2983
sp : ffff8000214d7890
x29: ffff8000214d78a0 x28: 0000000000000000 x27: 0000000000000008
x26: dfff800000000000 x25: 0000000000000003 x24: ffff0000ed5de029
x23: 0000000000000155 x22: 000000000000000a x21: ffff0000ed5de010
x20: 0000000000000005 x19: ffff0000ed5de021 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800011b3e320 x15: 0000000000000040
x14: 0000000000000001 x13: 1ffff0000429ae78 x12: 0000000000080000
x11: 000000000000af16 x10: ffff80002a431000 x9 : c832794890d47000
x8 : c832794890d47000 x7 : ffff800008293da4 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff80000a8d09fc
x2 : ffff00019f420d10 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x488/0x48c fs/jfs/jfs_dmap.c:2983
 dbAllocDmapLev+0x74/0x348 fs/jfs/jfs_dmap.c:1969
 dbAllocCtl+0x128/0x8c0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0xab8/0xe24 fs/jfs/jfs_dmap.c:1472
 dbDiscardAG+0x1e0/0x674 fs/jfs/jfs_dmap.c:1608
 jfs_ioc_trim+0x3f8/0x5f0 fs/jfs/jfs_discard.c:105
 jfs_ioctl+0x2ec/0x448 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+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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: 90043a63 91030063 528174e2 979d6ed1 (d4210000) 
---[ end trace 0000000000000000 ]---