loop2: detected capacity change from 0 to 32768
Unable to handle kernel paging request at virtual address dfff800000008ffd
KASAN: probably user-memory-access in range [0x0000000000047fe8-0x0000000000047fef]
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
[dfff800000008ffd] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 7866 Comm: syz.2.318 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : gen_poly_key fs/bcachefs/checksum.c:200 [inline]
pc : bch2_checksum+0x198/0x784 fs/bcachefs/checksum.c:236
lr : gen_poly_key fs/bcachefs/checksum.c:199 [inline]
lr : bch2_checksum+0x194/0x784 fs/bcachefs/checksum.c:236
sp : ffff80009c576660
x29: ffff80009c5769a0 x28: 0000000000047fe8 x27: 0000000000000000
x26: 0000000000000000 x25: ffff80009c5766c0 x24: dfff800000000000
x23: ffff80009c5767a0 x22: 0000000000000004 x21: ffff7000138aecd4
x20: ffff80009c576960 x19: ffff80009c576700 x18: 1fffe000366c3876
x17: ffff80008f8cd000 x16: ffff80008b47f808 x15: 0000000000000004
x14: 1ffff000138aecd8 x13: 0000000000000000 x12: 0000000000000000
x11: ffff7000138aecdc x10: 1ffff000138aecdb x9 : dfff800000000000
x8 : 0000000000008ffd x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000020
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff80009c5766c0
Call trace:
 gen_poly_key fs/bcachefs/checksum.c:200 [inline] (P)
 bch2_checksum+0x198/0x784 fs/bcachefs/checksum.c:236 (P)
 gen_poly_key fs/bcachefs/checksum.c:199 [inline] (L)
 bch2_checksum+0x194/0x784 fs/bcachefs/checksum.c:236 (L)
 read_one_super+0xba0/0x2310 fs/bcachefs/super-io.c:685
 __bch2_read_super+0x718/0x1020 fs/bcachefs/super-io.c:763
 bch2_read_super+0x38/0x4c fs/bcachefs/super-io.c:857
 bch2_fs_open+0x20c/0x27c4 fs/bcachefs/super.c:2033
 bch2_fs_get_tree+0x53c/0x1030 fs/bcachefs/fs.c:2157
 vfs_get_tree+0x90/0x28c fs/super.c:1814
 do_new_mount+0x278/0x900 fs/namespace.c:3507
 path_mount+0x590/0xe04 fs/namespace.c:3834
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount fs/namespace.c:4034 [inline]
 __arm64_sys_mount+0x4d4/0x5ac fs/namespace.c:4034
 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 2a1f03e1 52800402 97860291 d343ff88 (38786908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	2a1f03e1 	mov	w1, wzr
   4:	52800402 	mov	w2, #0x20                  	// #32
   8:	97860291 	bl	0xfffffffffe180a4c
   c:	d343ff88 	lsr	x8, x28, #3
* 10:	38786908 	ldrb	w8, [x8, x24] <-- trapping instruction