Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 22391 Comm: syz.3.4284 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:bfs_move_block fs/bfs/file.c:43 [inline]
RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline]
RIP: 0010:bfs_get_block+0x589/0xae0 fs/bfs/file.c:126
Code: f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 a0 8e 86 ff 49 8b 5d 20 4d 8d 66 28 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 8b 6c 24 18 74 08 4c 89 e7 e8 74 8e 86 ff 4c 89 ef
RSP: 0018:ffffc900043e6418 EFLAGS: 00010216
RAX: 0000000000000005 RBX: 0000000000000200 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffff8880345832d8
RBP: ffff8880235459f0 R08: ffffea0001adddf7 R09: 1ffffd400035bbbe
R10: dffffc0000000000 R11: fffff9400035bbbf R12: 0000000000000028
R13: ffff8880345832b8 R14: 0000000000000000 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff888125563000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555688ab4e8 CR3: 00000000a91f8000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __block_write_begin_int+0x6c6/0x1910 fs/buffer.c:2142
 block_write_begin+0x8d/0x120 fs/buffer.c:2253
 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180
 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
 __kernel_write+0x106/0x170 fs/read_write.c:641
 __dump_emit fs/coredump.c:1221 [inline]
 dump_emit+0x8e9/0xab0 fs/coredump.c:1259
 elf_core_dump+0x2e5d/0x3ad0 fs/binfmt_elf.c:2089
 coredump_write+0x1216/0x1910 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: 0033:0x7fa56fe52777
Code: e8 8e fa ff ff 89 f2 48 8d 3d 0d 41 1b 00 48 8d 35 34 fa 1d 00 31 c0 e8 e7 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:00007fa570dca120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fa56ff9c799
RDX: 00007fa570dca140 RSI: 00007fa570dca270 RDI: 000000000000000b
RBP: 00007fa570032bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fa570216128 R14: 00007fa570216090 R15: 00007ffc50d5d328
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bfs_move_block fs/bfs/file.c:43 [inline]
RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline]
RIP: 0010:bfs_get_block+0x589/0xae0 fs/bfs/file.c:126
Code: f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 a0 8e 86 ff 49 8b 5d 20 4d 8d 66 28 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 8b 6c 24 18 74 08 4c 89 e7 e8 74 8e 86 ff 4c 89 ef
RSP: 0018:ffffc900043e6418 EFLAGS: 00010216
RAX: 0000000000000005 RBX: 0000000000000200 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffff8880345832d8
RBP: ffff8880235459f0 R08: ffffea0001adddf7 R09: 1ffffd400035bbbe
R10: dffffc0000000000 R11: fffff9400035bbbf R12: 0000000000000028
R13: ffff8880345832b8 R14: 0000000000000000 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff888125463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c360c6c CR3: 00000000a91f8000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   a:	74 05                	je     0x11
   c:	e8 a0 8e 86 ff       	call   0xff868eb1
  11:	49 8b 5d 20          	mov    0x20(%r13),%rbx
  15:	4d 8d 66 28          	lea    0x28(%r14),%r12
  19:	4c 89 e0             	mov    %r12,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	48 8b 6c 24 18       	mov    0x18(%rsp),%rbp
  33:	74 08                	je     0x3d
  35:	4c 89 e7             	mov    %r12,%rdi
  38:	e8 74 8e 86 ff       	call   0xff868eb1
  3d:	4c 89 ef             	mov    %r13,%rdi