loop6: 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: 0 PID: 6277 Comm: syz.6.370 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983
lr : dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983
sp : ffff800020fc7860
x29: ffff800020fc7870 x28: 0000000000000008 x27: 0000000000000000
x26: 0000000000000003 x25: 0000000000000005 x24: 0000000000000155
x23: ffff0000e7d91021 x22: 000000000000000a x21: ffff0000e7d91010
x20: 0000000000000005 x19: dfff800000000000 x18: ffff800011abbcc0
x17: 1fffe00033ed797e x16: ffff8000082d25ac x15: 0000000040000000
x14: 0000000000000002 x13: 1ffff00002a180b1 x12: 0000000000080000
x11: 0000000000007816 x10: ffff80002520c000 x9 : 59c473968df1db00
x8 : 59c473968df1db00 x7 : ffff800008251e80 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff80000a8467ac
x2 : ffff00019f6bcd10 x1 : 0000000100000000 x0 : 000000000000002b
Call trace:
 dbFindLeaf+0x484/0x488 fs/jfs/jfs_dmap.c:2983
 dbAllocDmapLev+0x74/0x36c fs/jfs/jfs_dmap.c:1969
 dbAllocCtl+0x130/0x8e0 fs/jfs/jfs_dmap.c:1825
 dbAllocAG+0xa68/0xdc0 fs/jfs/jfs_dmap.c:1472
 dbDiscardAG+0x1e0/0x66c fs/jfs/jfs_dmap.c:1608
 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: b0042dc3 91240063 528174e2 959de46f (d4210000) 
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