do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Unable to handle kernel paging request at virtual address dfff800000000004
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
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
[dfff800000000004] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 8367 Comm: syz.0.565 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : crypto_shash_alg include/crypto/hash.h:733 [inline]
pc : crypto_shash_update+0x50/0xa8 crypto/shash.c:52
lr : crypto_shash_update+0x30/0xa8 crypto/shash.c:51
sp : ffff80009f6461e0
x29: ffff80009f6461e0 x28: fff1000040000000 x27: ffff80009f6463c0
x26: ffff0000c557e7d0 x25: dfff800000000000 x24: ffff80009f6463c0
x23: dfff800000000000 x22: 0000000000000020 x21: ffff80009f6463c0
x20: ffff0000ec3d1000 x19: 0000000000001000 x18: 0000000000000008
x17: 0000000000000000 x16: ffff800082f95f34 x15: 0000000000000001
x14: 1ffff00011eb66f6 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700011eb66f7 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000004 x7 : 0000000000000001 x6 : 0000000000000001
x5 : 00000000ffffffff x4 : 0000000000000cc0 x3 : 0000000000000040
x2 : 0000000000001000 x1 : ffff0000ec3d1000 x0 : ffff80009f6463c0
Call trace:
 crypto_shash_alg include/crypto/hash.h:733 [inline]
 crypto_shash_update+0x50/0xa8 crypto/shash.c:52
 __bch2_checksum_bio+0xbf4/0x10d8 fs/bcachefs/checksum.c:300
 bch2_checksum_bio+0xc0/0x10c fs/bcachefs/checksum.c:319
 bch2_write_extent fs/bcachefs/io_write.c:1044 [inline]
 __bch2_write+0x1d20/0x47f4 fs/bcachefs/io_write.c:1461
 bch2_write+0x8bc/0x153c fs/bcachefs/io_write.c:1634
 closure_queue include/linux/closure.h:269 [inline]
 closure_call include/linux/closure.h:425 [inline]
 bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:460 [inline]
 bch2_writepages+0x224/0x304 fs/bcachefs/fs-io-buffered.c:652
 do_writepages+0x2f8/0x7c4 mm/page-writeback.c:2656
 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:397
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 file_write_and_wait_range+0x178/0x260 mm/filemap.c:788
 bch2_fsync+0x94/0x144 fs/bcachefs/fs-io.c:197
 vfs_fsync_range+0x168/0x188 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2794 [inline]
 bch2_buffered_write fs/bcachefs/fs-io-buffered.c:1128 [inline]
 bch2_write_iter+0x2990/0x2d24 fs/bcachefs/fs-io-buffered.c:1136
 do_iter_readv_writev+0x438/0x658
 vfs_writev+0x410/0xb80 fs/read_write.c:971
 do_pwritev fs/read_write.c:1072 [inline]
 __do_sys_pwritev2 fs/read_write.c:1131 [inline]
 __se_sys_pwritev2 fs/read_write.c:1122 [inline]
 __arm64_sys_pwritev2+0x1dc/0x2f0 fs/read_write.c:1122
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: 9778bf8d f94002a8 91008116 d343fec8 (38776908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9778bf8d 	bl	0xfffffffffde2fe34
   4:	f94002a8 	ldr	x8, [x21]
   8:	91008116 	add	x22, x8, #0x20
   c:	d343fec8 	lsr	x8, x22, #3
* 10:	38776908 	ldrb	w8, [x8, x23] <-- trapping instruction