Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 6414 Comm: syz.1.105 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:_find_first_zero_bit+0x29/0xb0 lib/find_bit.c:149
Code: 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 48 89 f3 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 b8 55 7c fd 49 8b 06 48 83 f8 ff
RSP: 0018:ffffc900050974c0 EFLAGS: 00010256
RAX: 0000000000000000 RBX: 000000000000f800 RCX: 0000000000000000
RDX: ffff888032d50c40 RSI: 000000000000f800 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000a12e8c R12: ffff888067734930
R13: ffff888032d50c38 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125223000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0f494b0bb0 CR3: 000000007d061000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 find_first_zero_bit include/linux/find.h:391 [inline]
 slot_get fs/gfs2/quota.c:355 [inline]
 qdsb_get+0x133/0x340 fs/gfs2/quota.c:522
 gfs2_quota_hold+0x191/0x5c0 fs/gfs2/quota.c:606
 gfs2_dinode_dealloc+0x176/0x3f0 fs/gfs2/inode.c:488
 evict_unlinked_inode fs/gfs2/super.c:1329 [inline]
 gfs2_evict_inode+0x11cd/0x1400 fs/gfs2/super.c:1479
 evict+0x624/0xb50 fs/inode.c:825
 gfs2_put_super+0x300/0x860 fs/gfs2/super.c:618
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:647
 kill_block_super+0x44/0x90 fs/super.c:1665
 deactivate_locked_super+0xbc/0x130 fs/super.c:477
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x73a/0x2360 kernel/exit.c:1004
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
 get_signal+0x121b/0x12c0 kernel/signal.c:3038
 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: 0033:0x7fb863b9ce61
Code: Unable to access opcode bytes at 0x7fb863b9ce37.
RSP: 002b:0000000000000030 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fb863e16090 RCX: 00007fb863b9ce59
RDX: 0000000000000000 RSI: 0000000000000030 RDI: 0000000000000600
RBP: 00007fb863c32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fb863e16128 R14: 00007fb863e16090 R15: 00007ffd2e65d748
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_find_first_zero_bit+0x29/0xb0 lib/find_bit.c:149
Code: 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 85 f6 74 46 48 89 f3 49 89 fe 49 bf 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 b8 55 7c fd 49 8b 06 48 83 f8 ff
RSP: 0018:ffffc900050974c0 EFLAGS: 00010256
RAX: 0000000000000000 RBX: 000000000000f800 RCX: 0000000000000000
RDX: ffff888032d50c40 RSI: 000000000000f800 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000a12e8c R12: ffff888067734930
R13: ffff888032d50c38 R14: 0000000000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125223000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0f494b0bb0 CR3: 000000007d061000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	f3 0f 1e fa          	endbr64
   5:	41 57                	push   %r15
   7:	41 56                	push   %r14
   9:	41 55                	push   %r13
   b:	41 54                	push   %r12
   d:	53                   	push   %rbx
   e:	48 85 f6             	test   %rsi,%rsi
  11:	74 46                	je     0x59
  13:	48 89 f3             	mov    %rsi,%rbx
  16:	49 89 fe             	mov    %rdi,%r14
  19:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  20:	fc ff df
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 b8 55 7c fd       	call   0xfd7c55f1
  39:	49 8b 06             	mov    (%r14),%rax
  3c:	48 83 f8 ff          	cmp    $0xffffffffffffffff,%rax