UFO tlock:0xffffc9000297a318 BUG at fs/jfs/jfs_txnmgr.c:662 assert(last) ------------[ cut here ]------------ kernel BUG at fs/jfs/jfs_txnmgr.c:662! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 12593 Comm: syz.2.1404 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662 Code: e9 6a f8 ff ff e8 de 4e 65 fe 48 c7 c7 a0 9f 0b 8c 48 c7 c6 99 9b 0b 8c ba 96 02 00 00 48 c7 c1 c0 a0 0b 8c e8 9f 58 c7 fd 90 <0f> 0b e8 b7 4e 65 fe 48 c7 c7 80 a1 0b 8c e8 8b 58 c7 fd 48 c7 c7 RSP: 0000:ffffc9000453de40 EFLAGS: 00010246 RAX: 000000000000002b RBX: 0000000000000000 RCX: ac0c3b0e71b82100 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000453df68 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1cbd9ec R12: 1ffff9200052f400 R13: ffffc9000297a000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f09e3b2a6c0(0000) GS:ffff888125455000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffe70 CR3: 000000007c71c000 CR4: 00000000003526f0 Call Trace: diWrite+0x444/0x1f40 fs/jfs/jfs_imap.c:654 txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1256 jfs_commit_inode+0x2ef/0x530 fs/jfs/inode.c:114 extAlloc+0xc95/0x1020 fs/jfs/jfs_extent.c:177 jfs_get_block+0x358/0xad0 fs/jfs/inode.c:254 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2143 block_write_begin+0x8d/0x120 fs/buffer.c:2254 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4319 generic_file_write_iter+0x14a/0x680 mm/filemap.c:4462 __kernel_write_iter+0x41e/0x880 fs/read_write.c:621 dump_emit_page fs/coredump.c:1299 [inline] dump_user_range+0xb89/0x12d0 fs/coredump.c:1373 elf_core_dump+0x34c2/0x3ad0 fs/binfmt_elf.c:2111 coredump_write+0x1219/0x1950 fs/coredump.c:1050 do_coredump fs/coredump.c:1127 [inline] vfs_coredump+0x36a9/0x4280 fs/coredump.c:1201 get_signal+0x1107/0x1330 kernel/signal.c:3019 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x176/0x620 kernel/entry/common.c:219 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f09e2b9c631 Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:fffffffffffffe70 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f09e2e15fa0 RCX: 00007f09e2b9c629 RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000 RBP: 00007f09e2c32b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f09e2e16038 R14: 00007f09e2e15fa0 R15: 00007fff6ee7ce78 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:txLock+0x1b92/0x1cc0 fs/jfs/jfs_txnmgr.c:662 Code: e9 6a f8 ff ff e8 de 4e 65 fe 48 c7 c7 a0 9f 0b 8c 48 c7 c6 99 9b 0b 8c ba 96 02 00 00 48 c7 c1 c0 a0 0b 8c e8 9f 58 c7 fd 90 <0f> 0b e8 b7 4e 65 fe 48 c7 c7 80 a1 0b 8c e8 8b 58 c7 fd 48 c7 c7 RSP: 0000:ffffc9000453de40 EFLAGS: 00010246 RAX: 000000000000002b RBX: 0000000000000000 RCX: ac0c3b0e71b82100 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc9000453df68 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1cbd9ec R12: 1ffff9200052f400 R13: ffffc9000297a000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f09e3b2a6c0(0000) GS:ffff888125455000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffe70 CR3: 000000007c71c000 CR4: 00000000003526f0