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: 1 UID: 0 PID: 21047 Comm: syz.1.2867 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663 Code: e9 c5 f7 ff ff e8 45 42 5d fe 48 c7 c7 a0 71 2c 8c 48 c7 c6 99 6d 2c 8c ba 97 02 00 00 48 c7 c1 c0 72 2c 8c e8 c6 f8 bd fd 90 <0f> 0b e8 1e 42 5d fe 48 c7 c7 80 73 2c 8c e8 b2 f8 bd fd 48 c7 c7 RSP: 0018:ffffc90004a3e0e0 EFLAGS: 00010246 RAX: 000000000000002b RBX: 0000000000000000 RCX: 5cc853efdcafb400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc90004a3e210 R08: ffff8880b8724713 R09: 1ffff110170e48e2 R10: dffffc0000000000 R11: ffffed10170e48e3 R12: 0000000000000000 R13: ffffc900028d2000 R14: 0000000000000000 R15: 1ffff9200051a400 FS: 000055557bacc500(0000) GS:ffff888125055000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb7fcb83541 CR3: 0000000084bff000 CR4: 0000000000350ef0 Call Trace: 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:2123 block_write_begin+0x8d/0x120 fs/buffer.c:2234 jfs_write_begin+0x35/0x80 fs/jfs/inode.c:306 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4358 generic_file_write_iter+0xae/0x330 mm/filemap.c:4501 __kernel_write_iter+0x44a/0x8f0 fs/read_write.c:621 dump_emit_page fs/coredump.c:1298 [inline] dump_user_range+0xc19/0x12c0 fs/coredump.c:1372 elf_core_dump+0x3485/0x3a90 fs/binfmt_elf.c:2109 coredump_write+0x1290/0x1960 fs/coredump.c:1052 do_coredump fs/coredump.c:1131 [inline] vfs_coredump+0x36ff/0x44b0 fs/coredump.c:1200 get_signal+0x1094/0x12c0 kernel/signal.c:3031 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop kernel/entry/common.c:101 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] irqentry_exit+0x2ba/0x8f0 kernel/entry/common.c:165 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f798ea53bd7 Code: e8 fe f9 ff ff 89 f2 48 8d 3d 5d 4f 1b 00 48 8d 35 c3 0a 1e 00 31 c0 e8 37 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8 RSP: 002b:00007fffcfa104e0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000000000 RDX: 00007fffcfa10500 RSI: 00007fffcfa10630 RDI: 000000000000000b RBP: 00007fffcfb0e190 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 00007fffcfb0e1d0 R13: 00007f798ee25fac R14: 000000000017f56a R15: 00007f798ee25fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:txLock+0x1bdb/0x1d10 fs/jfs/jfs_txnmgr.c:663 Code: e9 c5 f7 ff ff e8 45 42 5d fe 48 c7 c7 a0 71 2c 8c 48 c7 c6 99 6d 2c 8c ba 97 02 00 00 48 c7 c1 c0 72 2c 8c e8 c6 f8 bd fd 90 <0f> 0b e8 1e 42 5d fe 48 c7 c7 80 73 2c 8c e8 b2 f8 bd fd 48 c7 c7 RSP: 0018:ffffc90004a3e0e0 EFLAGS: 00010246 RAX: 000000000000002b RBX: 0000000000000000 RCX: 5cc853efdcafb400 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: ffffc90004a3e210 R08: ffff8880b8724713 R09: 1ffff110170e48e2 R10: dffffc0000000000 R11: ffffed10170e48e3 R12: 0000000000000000 R13: ffffc900028d2000 R14: 0000000000000000 R15: 1ffff9200051a400 FS: 000055557bacc500(0000) GS:ffff888125055000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb7fcb83541 CR3: 0000000084bff000 CR4: 0000000000350ef0