loop0: detected capacity change from 32768 to 0
BUG at fs/jfs/jfs_dmap.c:2993 assert(n < 4)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_dmap.c:2993!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6049 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:dbFindLeaf+0x107/0x220 fs/jfs/jfs_dmap.c:2993
Code: f0 7d 29 83 c3 01 44 39 eb 75 ba 48 c7 c1 c0 48 c1 88 ba b1 0b 00 00 48 c7 c6 00 47 c1 88 48 c7 c7 40 47 c1 88 e8 5e 7f 6f 05 <0f> 0b 8d 04 9d 01 00 00 00 83 e9 01 75 87 49 8d 7c 24 08 48 b8 00
RSP: 0018:ffffc9000100f5a8 EFLAGS: 00010286
RAX: 000000000000002b RBX: 000000000000001d RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff88ddad60 RDI: fffff52000201ea8
RBP: 000000000000001c R08: 000000000000002b R09: ffff8880b9e4c867
R10: ffffed10173c990c R11: 0000000000000001 R12: ffff88801cd92010
R13: 000000000000001d R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f7bb687c700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000c380 CR3: 0000000013159000 CR4: 0000000000350ef0
Call Trace:
 dbAllocDmapLev+0x86/0x260 fs/jfs/jfs_dmap.c:1997
 dbAlloc+0x6d5/0xa20 fs/jfs/jfs_dmap.c:817
 extBalloc fs/jfs/jfs_extent.c:518 [inline]
 extAlloc+0x434/0xc70 fs/jfs/jfs_extent.c:125
 jfs_get_block+0x4f8/0x960 fs/jfs/inode.c:256
 nobh_write_begin+0x353/0xbd0 fs/buffer.c:2648
 jfs_write_begin+0x2d/0xc0 fs/jfs/inode.c:320
 generic_perform_write+0x1ce/0x430 mm/filemap.c:3412
 __generic_file_write_iter+0x1fb/0x590 mm/filemap.c:3541
 generic_file_write_iter+0xb9/0x1c0 mm/filemap.c:3573
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x333/0x6d0 fs/read_write.c:740
 do_iter_write+0x12a/0x5b0 fs/read_write.c:866
 vfs_writev+0x16c/0x500 fs/read_write.c:939
 do_writev+0x10b/0x280 fs/read_write.c:982
 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f7bb71085a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7bb687c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f7bb7229f80 RCX: 00007f7bb71085a9
RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007f7bb7163580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffffd1cc9af R14: 00007f7bb687c300 R15: 0000000000022000
Modules linked in:
---[ end trace 70e4d8ccc7c38e6f ]---
RIP: 0010:dbFindLeaf+0x107/0x220 fs/jfs/jfs_dmap.c:2993
Code: f0 7d 29 83 c3 01 44 39 eb 75 ba 48 c7 c1 c0 48 c1 88 ba b1 0b 00 00 48 c7 c6 00 47 c1 88 48 c7 c7 40 47 c1 88 e8 5e 7f 6f 05 <0f> 0b 8d 04 9d 01 00 00 00 83 e9 01 75 87 49 8d 7c 24 08 48 b8 00
RSP: 0018:ffffc9000100f5a8 EFLAGS: 00010286
RAX: 000000000000002b RBX: 000000000000001d RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff88ddad60 RDI: fffff52000201ea8
RBP: 000000000000001c R08: 000000000000002b R09: ffff8880b9e4c867
R10: ffffed10173c990c R11: 0000000000000001 R12: ffff88801cd92010
R13: 000000000000001d R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f7bb687c700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc07c99520 CR3: 0000000013159000 CR4: 0000000000350ef0