BUG at fs/jfs/jfs_dmap.c:3070 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:3070!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 6094 Comm: syz.0.74 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:dbFindLeaf+0x519/0x520 fs/jfs/jfs_dmap.c:3070
Code: e9 4e ff ff ff e8 07 68 60 fe 48 c7 c7 20 45 2c 8c 48 c7 c6 60 42 2c 8c ba fe 0b 00 00 48 c7 c1 40 50 2c 8c e8 08 b5 c1 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000512fab0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 7b9534e005e7a600
RDX: ffffc9000fc21000 RSI: 000000000000455a RDI: 000000000000455b
RBP: 0000000000000003 R08: ffffc9000512f827 R09: 1ffff92000a25f04
R10: dffffc0000000000 R11: fffff52000a25f05 R12: 000000000000000a
R13: 0000000000000005 R14: 0000000000000008 R15: 0000000000000155
FS:  00007f85e04e66c0(0000) GS:ffff888125059000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000301030 CR3: 000000007de16000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 dbAllocDmapLev+0x60/0x3b0 fs/jfs/jfs_dmap.c:2056
 dbAllocCtl+0x145/0x990 fs/jfs/jfs_dmap.c:1912
 dbAllocAG+0xbbd/0xf80 fs/jfs/jfs_dmap.c:1559
 dbDiscardAG+0x2d6/0x8f0 fs/jfs/jfs_dmap.c:1695
 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x28e/0x3b0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f85df59de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f85e04e6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f85df826090 RCX: 00007f85df59de59
RDX: 0000200000000180 RSI: 00000000c0185879 RDI: 0000000000000006
RBP: 00007f85df633e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f85df826128 R14: 00007f85df826090 R15: 00007ffff6e9bd98
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x519/0x520 fs/jfs/jfs_dmap.c:3070
Code: e9 4e ff ff ff e8 07 68 60 fe 48 c7 c7 20 45 2c 8c 48 c7 c6 60 42 2c 8c ba fe 0b 00 00 48 c7 c1 40 50 2c 8c e8 08 b5 c1 fd 90 <0f> 0b 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000512fab0 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 7b9534e005e7a600
RDX: ffffc9000fc21000 RSI: 000000000000455a RDI: 000000000000455b
RBP: 0000000000000003 R08: ffffc9000512f827 R09: 1ffff92000a25f04
R10: dffffc0000000000 R11: fffff52000a25f05 R12: 000000000000000a
R13: 0000000000000005 R14: 0000000000000008 R15: 0000000000000155
FS:  00007f85e04e66c0(0000) GS:ffff888125059000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf8217fd58 CR3: 000000007de16000 CR4: 0000000000350ef0