general protection fault, probably for non-canonical address 0xdffffc0000000049: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000248-0x000000000000024f]
CPU: 0 PID: 619 Comm: syz.6.66 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:bdev_try_to_free_page+0x4f/0x130 fs/ext4/super.c:1459
Code: c8 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 31 94 bf ff 41 bf 48 02 00 00 4d 03 3e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 12 94 bf ff 4d 8b 37 48 89 df be
RSP: 0018:ffffc90000d65d80 EFLAGS: 00010202
RAX: 0000000000000049 RBX: ffffea00045940c0 RCX: ffff88811ac9d000
RDX: 0000000000000000 RSI: ffffea00045940c0 RDI: ffff88811714b000
RBP: ffffc90000d65da8 R08: ffffea00045940c7 R09: 1ffffd40008b2818
R10: dffffc0000000000 R11: fffff940008b2819 R12: dffffc0000000000
R13: ffffffff852c9478 R14: ffff88811714b3c8 R15: 0000000000000248
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5d1277c40 CR3: 0000000126d00000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 blkdev_releasepage+0xd7/0x100 fs/block_dev.c:1971
 try_to_release_page+0x18d/0x1e0 mm/filemap.c:3705
 shrink_page_list+0x1712/0x4160 mm/vmscan.c:1467
 shrink_inactive_list+0x90c/0xef0 mm/vmscan.c:2075
 shrink_list mm/vmscan.c:2294 [inline]
 shrink_lruvec+0x281a/0x2ef0 mm/vmscan.c:5473
 shrink_node_memcgs mm/vmscan.c:5660 [inline]
 shrink_node+0xee0/0x2690 mm/vmscan.c:5690
 shrink_zones mm/vmscan.c:5896 [inline]
 do_try_to_free_pages+0x602/0x1590 mm/vmscan.c:5954
 try_to_free_mem_cgroup_pages+0x261/0x610 mm/vmscan.c:6272
 try_charge+0x426/0x1580 mm/memcontrol.c:2749
 __mem_cgroup_charge+0x148/0x6d0 mm/memcontrol.c:6881
 mem_cgroup_charge include/linux/memcontrol.h:458 [inline]
 shmem_add_to_page_cache+0x569/0xe10 mm/shmem.c:699
 shmem_getpage_gfp+0x907/0x20f0 mm/shmem.c:1952
 shmem_getpage mm/shmem.c:161 [inline]
 shmem_write_begin+0xce/0x1b0 mm/shmem.c:2497
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3638
 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:3670
 __kernel_write+0x5a5/0x9d0 fs/read_write.c:550
 dump_emit+0x255/0x380 fs/coredump.c:855
 dump_user_range+0x6a/0x1a0 fs/coredump.c:908
 elf_core_dump+0x27af/0x2c20 fs/binfmt_elf.c:2290
 do_coredump+0x1be6/0x2910 fs/coredump.c:817
 get_signal+0xf4c/0x1300 kernel/signal.c:2792
 arch_do_signal_or_restart+0xe7/0x11b0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:202
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:290
 irqentry_exit+0x12/0x60 kernel/entry/common.c:378
 exc_page_fault+0x67/0xc0 arch/x86/mm/fault.c:1495
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
RIP: 0033:0x7f6946e56cb7
Code: e8 fe f9 ff ff 89 f2 48 8d 3d ad 4e 1b 00 48 8d 35 d2 14 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:00007f6945998120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f6946fa1559
RDX: 00007f6945998140 RSI: 00007f6945998270 RDI: 000000000000000b
RBP: 00007f6947038b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f6947228218 R14: 00007f6947228180 R15: 00007ffc0e067f08
Modules linked in:
---[ end trace 5a6955fb56c14481 ]---
RIP: 0010:bdev_try_to_free_page+0x4f/0x130 fs/ext4/super.c:1459
Code: c8 03 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 31 94 bf ff 41 bf 48 02 00 00 4d 03 3e 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 12 94 bf ff 4d 8b 37 48 89 df be
RSP: 0018:ffffc90000d65d80 EFLAGS: 00010202
RAX: 0000000000000049 RBX: ffffea00045940c0 RCX: ffff88811ac9d000
RDX: 0000000000000000 RSI: ffffea00045940c0 RDI: ffff88811714b000
RBP: ffffc90000d65da8 R08: ffffea00045940c7 R09: 1ffffd40008b2818
R10: dffffc0000000000 R11: fffff940008b2819 R12: dffffc0000000000
R13: ffffffff852c9478 R14: ffff88811714b3c8 R15: 0000000000000248
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe1355e5000 CR3: 0000000126d00000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c8 03 00 00          	enter  $0x3,$0x0
   4:	4c 89 f0             	mov    %r14,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  10:	74 08                	je     0x1a
  12:	4c 89 f7             	mov    %r14,%rdi
  15:	e8 31 94 bf ff       	call   0xffbf944b
  1a:	41 bf 48 02 00 00    	mov    $0x248,%r15d
  20:	4d 03 3e             	add    (%r14),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 12 94 bf ff       	call   0xffbf944b
  39:	4d 8b 37             	mov    (%r15),%r14
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	be                   	.byte 0xbe