loop0: detected capacity change from 0 to 32768
syz.0.0: attempt to access beyond end of device
loop0: rw=2049, sector=44032, nr_sectors = 8 limit=32768
BUG at fs/jfs/jfs_txnmgr.c:663 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:663!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663
Code: e9 c5 f7 ff ff e8 05 8f 56 fe 48 c7 c7 e0 b8 4d 8c 48 c7 c6 d9 b4 4d 8c ba 97 02 00 00 48 c7 c1 00 ba 4d 8c e8 d6 18 b7 fd 90 <0f> 0b e8 de 8e 56 fe 48 c7 c7 c0 ba 4d 8c e8 c2 18 b7 fd 48 c7 c7
RSP: 0018:ffffc9000f42ed80 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: ae6b3cff83441900
RDX: ffffc9000e9c1000 RSI: 00000000000076d1 RDI: 00000000000076d2
RBP: ffffc9000f42eeb0 R08: ffffc9000f42eb07 R09: 1ffff92001e85d60
R10: dffffc0000000000 R11: fffff52001e85d61 R12: 0000000000000000
R13: ffffc90001083000 R14: 0000000000000000 R15: 1ffff92000210600
FS:  00007f05319eb6c0(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f05319c9ff8 CR3: 000000001f8f5000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 diWrite+0x444/0x1f60 fs/jfs/jfs_imap.c:654
 txCommit+0x83a/0x54a0 fs/jfs/jfs_txnmgr.c:1257
 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114
 extAlloc+0xc82/0x1010 fs/jfs/jfs_extent.c:177
 jfs_get_block+0x351/0xad0 fs/jfs/inode.c:254
 __block_write_begin_int+0x6c2/0x1900 fs/buffer.c:2030
 block_write_begin+0x8d/0x120 fs/buffer.c:2144
 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4374
 generic_file_write_iter+0xae/0x330 mm/filemap.c:4517
 iter_file_splice_write+0xa31/0x1240 fs/splice.c:736
 do_splice_from fs/splice.c:936 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1159
 splice_direct_to_actor+0x57b/0xcb0 fs/splice.c:1103
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x195/0x290 fs/splice.c:1228
 do_sendfile+0x52e/0x7c0 fs/read_write.c:1371
 __do_sys_sendfile64 fs/read_write.c:1432 [inline]
 __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0530b9e0d9
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:00007f05319eafe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f0530e25fa0 RCX: 00007f0530b9e0d9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007f0530c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0530e26038 R14: 00007f0530e25fa0 R15: 00007ffd5461b618
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663
Code: e9 c5 f7 ff ff e8 05 8f 56 fe 48 c7 c7 e0 b8 4d 8c 48 c7 c6 d9 b4 4d 8c ba 97 02 00 00 48 c7 c1 00 ba 4d 8c e8 d6 18 b7 fd 90 <0f> 0b e8 de 8e 56 fe 48 c7 c7 c0 ba 4d 8c e8 c2 18 b7 fd 48 c7 c7
RSP: 0018:ffffc9000f42ed80 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: ae6b3cff83441900
RDX: ffffc9000e9c1000 RSI: 00000000000076d1 RDI: 00000000000076d2
RBP: ffffc9000f42eeb0 R08: ffffc9000f42eb07 R09: 1ffff92001e85d60
R10: dffffc0000000000 R11: fffff52001e85d61 R12: 0000000000000000
R13: ffffc90001083000 R14: 0000000000000000 R15: 1ffff92000210600
FS:  00007f05319eb6c0(0000) GS:ffff88808c30a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000c62000 CR3: 000000001f8f5000 CR4: 0000000000352ef0