bcachefs (loop4): accounting_read... done
bcachefs (loop4): alloc_read... done
bcachefs (loop4): snapshots_read... done
bcachefs (loop4): done starting filesystem
Unable to handle kernel paging request at virtual address dfff800000000000
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6856 Comm: syz.4.49 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : rcu_pending_pcpu_dequeue+0x1a4/0x238 fs/bcachefs/rcu_pending.c:552
lr : rcu_pending_pcpu_dequeue+0x188/0x238 fs/bcachefs/rcu_pending.c:548
sp : ffff80009f196a30
x29: ffff80009f196a30 x28: dfff800000000000 x27: ffff0000f3900000
x26: 1fffe0001edd5800 x25: 1fffffbff7ee0b43 x24: fffffdffbf705a30
x23: dfff800000000000 x22: fffffdffbf705a30 x21: 0000000000000003
x20: fffffdffbf705a18 x19: fffffdffbf705900 x18: 00000000ffffffff
x17: ffffffff00000000 x16: ffff8000805201b0 x15: ffff700013e32d2c
x14: 1ffff00013e32d2c x13: 0000000000000004 x12: ffffffffffffffff
x11: 0000000000080000 x10: 000000000007ffff x9 : ffff8000a591c000
x8 : 0000000000000000 x7 : ffff8000829d022c x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff8000805202c8
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000001
Call trace:
 rcu_pending_pcpu_dequeue+0x1a4/0x238 fs/bcachefs/rcu_pending.c:552 (P)
 rcu_pending_dequeue+0x44/0x54 fs/bcachefs/rcu_pending.c:568
 bkey_cached_alloc fs/bcachefs/btree_key_cache.c:143 [inline]
 btree_key_cache_create fs/bcachefs/btree_key_cache.c:222 [inline]
 btree_key_cache_fill+0x2c4/0x2190 fs/bcachefs/btree_key_cache.c:332
 bch2_btree_path_traverse_cached+0x5f8/0x8f4 fs/bcachefs/btree_key_cache.c:387
 bch2_btree_path_traverse_one+0x320/0x21ec fs/bcachefs/btree_iter.c:1165
 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:248 [inline]
 bch2_btree_iter_peek_slot+0x58c/0x1844 fs/bcachefs/btree_iter.c:2760
 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:591 [inline]
 bch2_bkey_get_iter fs/bcachefs/btree_iter.h:605 [inline]
 __bch2_inode_peek+0x10c/0x2c8 fs/bcachefs/inode.c:347
 bch2_inode_peek fs/bcachefs/inode.h:136 [inline]
 bch2_inode_find_by_inum_trans+0xb0/0x128 fs/bcachefs/inode.c:1122
 bch2_vfs_inode_get+0x158/0x2d4 fs/bcachefs/fs.c:504
 bch2_fs_get_tree+0xb48/0xef4 fs/bcachefs/fs.c:2257
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 do_new_mount+0x228/0x814 fs/namespace.c:3879
 path_mount+0x5b4/0xde0 fs/namespace.c:4206
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount fs/namespace.c:4407 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4407
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 9774ff3c aa1f03f5 1400001d d343fea8 (38776908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9774ff3c 	bl	0xfffffffffdd3fcf0
   4:	aa1f03f5 	mov	x21, xzr
   8:	1400001d 	b	0x7c
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38776908 	ldrb	w8, [x8, x23] <-- trapping instruction