------------[ cut here ]------------ kernel BUG at fs/buffer.c:2068! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 13339 Comm: syz-executor.0 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__block_commit_write.constprop.0.isra.0+0x32d/0x3c0 fs/buffer.c:2068 Code: d9 66 e4 ff f0 80 0b 01 e9 4d ff ff ff e8 4b 29 9e ff 48 8b 7c 24 10 48 c7 c6 80 e9 99 89 e8 4a ee d0 ff 0f 0b e8 33 29 9e ff <0f> 0b e8 2c 29 9e ff 48 8b 7c 24 10 48 c7 c6 60 ee 99 89 e8 2b ee RSP: 0018:ffffc90002d3f908 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888026bb1c40 RSI: ffffffff81d77fcd RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81d77d48 R11: 0000000000000000 R12: 0000000000000082 R13: 0000000000000000 R14: ffffea0000e415c0 R15: 0000000000000082 FS: 00007f3f708ae700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002e453000 CR4: 0000000000350ef0 Call Trace: block_write_end+0x4f/0x140 fs/buffer.c:2158 ext4_write_end+0x273/0xf60 fs/ext4/inode.c:1299 ext4_da_write_end+0x440/0xb50 fs/ext4/inode.c:3079 generic_perform_write+0x2bd/0x500 mm/filemap.c:3667 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269 ext4_file_write_iter+0x423/0x14e0 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x75a/0xa40 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3f708ae188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000082 RSI: 0000000020000180 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff475bc01f R14: 00007f3f708ae300 R15: 0000000000022000 Modules linked in: ---[ end trace 19d02f3f8f6a14d8 ]--- RIP: 0010:__block_commit_write.constprop.0.isra.0+0x32d/0x3c0 fs/buffer.c:2068 Code: d9 66 e4 ff f0 80 0b 01 e9 4d ff ff ff e8 4b 29 9e ff 48 8b 7c 24 10 48 c7 c6 80 e9 99 89 e8 4a ee d0 ff 0f 0b e8 33 29 9e ff <0f> 0b e8 2c 29 9e ff 48 8b 7c 24 10 48 c7 c6 60 ee 99 89 e8 2b ee RSP: 0018:ffffc90002d3f908 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888026bb1c40 RSI: ffffffff81d77fcd RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81d77d48 R11: 0000000000000000 R12: 0000000000000082 R13: 0000000000000000 R14: ffffea0000e415c0 R15: 0000000000000082 FS: 00007f3f708ae700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001d8c848 CR3: 000000002e453000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: d9 66 e4 fldenv -0x1c(%rsi) 3: ff f0 push %rax 5: 80 0b 01 orb $0x1,(%rbx) 8: e9 4d ff ff ff jmpq 0xffffff5a d: e8 4b 29 9e ff callq 0xff9e295d 12: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi 17: 48 c7 c6 80 e9 99 89 mov $0xffffffff8999e980,%rsi 1e: e8 4a ee d0 ff callq 0xffd0ee6d 23: 0f 0b ud2 25: e8 33 29 9e ff callq 0xff9e295d 2a: 0f 0b ud2 <-- trapping instruction 2c: e8 2c 29 9e ff callq 0xff9e295d 31: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi 36: 48 c7 c6 60 ee 99 89 mov $0xffffffff8999ee60,%rsi 3d: e8 .byte 0xe8 3e: 2b ee sub %esi,%ebp