loop0: detected capacity change from 0 to 32768
BUG at fs/jfs/jfs_dmap.c:2949 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2949!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4995 Comm: syz-executor296 Not tainted 6.4.0-rc6-syzkaller-00037-gb6dad5178cea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:dbFindLeaf+0x41f/0x430 fs/jfs/jfs_dmap.c:2949
Code: d7 cc db fe eb 89 e8 c0 f4 83 fe 48 c7 c7 a0 3e 21 8b 48 c7 c6 e0 3b 21 8b ba 85 0b 00 00 48 c7 c1 60 49 21 8b e8 21 e3 a5 07 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56
RSP: 0018:ffffc90003c0f978 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000020 RCX: 8b3d7253a9bb9500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffffff816f00ac R09: fffff52000781ee5
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888029164010
R13: 000000000000000a R14: ffff888029164041 R15: 000000000000001d
FS:  0000555555cd8300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fde89a20d8 CR3: 000000002247f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dbAllocDmapLev+0xce/0x430 fs/jfs/jfs_dmap.c:1953
 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1809
 dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1350
 dbDiscardAG+0x352/0xa10 fs/jfs/jfs_dmap.c:1599
 jfs_ioc_trim+0x433/0x660 fs/jfs/jfs_discard.c:100
 jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f43a4c27839
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd4a26f388 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f43a4c27839
RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007f43a4be70d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f43a4be7160
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbFindLeaf+0x41f/0x430 fs/jfs/jfs_dmap.c:2949
Code: d7 cc db fe eb 89 e8 c0 f4 83 fe 48 c7 c7 a0 3e 21 8b 48 c7 c6 e0 3b 21 8b ba 85 0b 00 00 48 c7 c1 60 49 21 8b e8 21 e3 a5 07 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 41 57 41 56
RSP: 0018:ffffc90003c0f978 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000020 RCX: 8b3d7253a9bb9500
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffffffff816f00ac R09: fffff52000781ee5
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888029164010
R13: 000000000000000a R14: ffff888029164041 R15: 000000000000001d
FS:  0000555555cd8300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fde89a20d8 CR3: 000000002247f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400