UFO tlock:0xffffc90002622240
BUG at fs/jfs/jfs_txnmgr.c:661 assert(last)
------------[ cut here ]------------
kernel BUG at fs/jfs/jfs_txnmgr.c:661!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6981 Comm: syz.7.355 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:txLock+0x1a0d/0x1b10 fs/jfs/jfs_txnmgr.c:661
Code: fe e9 48 f8 ff ff e8 a2 51 aa fe 48 c7 c7 c0 5f 42 8a 48 c7 c6 b9 5b 42 8a ba 95 02 00 00 48 c7 c1 c0 60 42 8a e8 73 74 d1 06 <0f> 0b e8 7c 51 aa fe 48 c7 c7 80 61 42 8a e8 60 74 d1 06 48 c7 c7
RSP: 0018:ffffc9000501e870 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 54e6196c48ee9f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 0000000000000000
R13: ffffc90002622000 R14: ffffc90002622000 R15: 1ffff920004c4400
FS:  00007f5a9afae6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5a9af8cf98 CR3: 0000000061d2e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 diWrite+0x43c/0x1610 fs/jfs/jfs_imap.c:654
 txCommit+0x84b/0x51c0 fs/jfs/jfs_txnmgr.c:1255
 jfs_commit_inode+0x2ec/0x520 fs/jfs/inode.c:108
 extAlloc+0xb97/0xf30 fs/jfs/jfs_extent.c:175
 jfs_get_block+0x343/0xab0 fs/jfs/inode.c:258
 nobh_write_begin+0x3d5/0xe80 fs/buffer.c:2650
 jfs_write_begin+0x3d/0x80 fs/jfs/inode.c:322
 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 __kernel_write+0x4f9/0x930 fs/read_write.c:539
 __dump_emit+0x243/0x360 fs/coredump.c:943
 dump_user_range+0x84/0x340 fs/coredump.c:1017
 elf_core_dump+0x2ff7/0x3530 fs/binfmt_elf.c:2285
 do_coredump+0x1419/0x2960 fs/coredump.c:894
 get_signal+0x40a/0x12c0 kernel/signal.c:2886
 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
 exc_general_protection+0x1e4/0x270 arch/x86/kernel/traps.c:562
 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:600
RIP: 0033:0x7f5a9cd686d1
Code: 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00002000000002c0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f5a9cfbf090 RCX: 00007f5a9cd686c9
RDX: 0000200000000040 RSI: 00002000000002c0 RDI: 0000000000000080
RBP: 00007f5a9cdeaf91 R08: 0000200000000300 R09: 0000200000000300
R10: 0000200000000080 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f5a9cfbf128 R14: 00007f5a9cfbf090 R15: 00007ffd3e1046e8
 </TASK>
Modules linked in:
---[ end trace e3fd5a795a1f86e6 ]---
RIP: 0010:txLock+0x1a0d/0x1b10 fs/jfs/jfs_txnmgr.c:661
Code: fe e9 48 f8 ff ff e8 a2 51 aa fe 48 c7 c7 c0 5f 42 8a 48 c7 c6 b9 5b 42 8a ba 95 02 00 00 48 c7 c1 c0 60 42 8a e8 73 74 d1 06 <0f> 0b e8 7c 51 aa fe 48 c7 c7 80 61 42 8a e8 60 74 d1 06 48 c7 c7
RSP: 0018:ffffc9000501e870 EFLAGS: 00010246
RAX: 000000000000002b RBX: 0000000000000000 RCX: 54e6196c48ee9f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10172067b0
R10: ffffed10172067b0 R11: 1ffff110172067af R12: 0000000000000000
R13: ffffc90002622000 R14: ffffc90002622000 R15: 1ffff920004c4400
FS:  00007f5a9afae6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb170c2000 CR3: 0000000061d2e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400