Oops: general protection fault, probably for non-canonical address 0xdffffc000000002f: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000178-0x000000000000017f] CPU: 1 UID: 0 PID: 8061 C[ 412.072476][ T8061] CPU: 1 UID: 0 PID: 8061 Comm: iou-wrk-8019 Tainted: G N syzkaller #0 PREEMPT_{RT,(full)} Tainted: [N]=TEST Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 90 88 18 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc900048a70a0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff81a109ae RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff81a109ae RDI: 000000000000002f RBP: ffffffff82406f7f R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000100 R11: 000000000000002f R12: 0000000000000000 R13: 0000000000000178 R14: 0000000000000178 R15: 0000000000000001 FS: 00007f5ab35566c0(0000) GS:ffff888125d3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f998b8ca2d0 CR3: 000000003cb4e000 CR4: 00000000003526f0 Call Trace: __kasan_check_byte+0x12/0x40 mm/kasan/common.c:573 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5842 down_write_nested+0x3e/0x60 kernel/locking/rwsem.c:1757 inode_lock_nested include/linux/fs.h:1069 [inline] __start_dirop fs/namei.c:2918 [inline] start_dirop+0x4f/0x90 fs/namei.c:2942 simple_start_creating+0xcc/0x110 fs/libfs.c:2305 debugfs_start_creating+0xdb/0x1a0 fs/debugfs/inode.c:394 debugfs_create_dir+0x24/0x350 fs/debugfs/inode.c:572 i2c_device_probe+0x814/0xbf0 drivers/i2c/i2c-core-base.c:588 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500 __device_attach+0x2c7/0x450 drivers/base/dd.c:1098 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x12d/0x220 drivers/base/bus.c:620 device_add+0x7d7/0xb80 drivers/base/core.c:3772 i2c_new_client_device+0xa29/0x1130 drivers/i2c/i2c-core-base.c:1019 new_device_store+0x24b/0x530 drivers/i2c/i2c-core-base.c:1307 kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345 io_write+0xb04/0x1690 io_uring/rw.c:1182 __io_issue_sqe+0x188/0x4d0 io_uring/io_uring.c:1395 io_issue_sqe+0x16d/0x1020 io_uring/io_uring.c:1418 io_wq_submit_work+0xa21/0xca0 io_uring/io_uring.c:1534 io_worker_handle_work+0x72e/0x10e0 io_uring/io-wq.c:652 io_wq_worker+0x452/0xf10 io_uring/io-wq.c:706 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:210 Code: 79 ff ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 90 88 18 09 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc900048a70a0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff81a109ae RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff81a109ae RDI: 000000000000002f RBP: ffffffff82406f7f R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000100 R11: 000000000000002f R12: 0000000000000000 R13: 0000000000000178 R14: 0000000000000178 R15: 0000000000000001 FS: 00007f5ab35566c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f998af1f7e0 CR3: 000000003cb4e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 0f 1f 40 00 nopl 0x0(%rax) 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 0f 1f 40 d6 nopl -0x2a(%rax) 18: 48 c1 ef 03 shr $0x3,%rdi 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df * 26: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction 2a: 3c 08 cmp $0x8,%al 2c: 0f 92 c0 setb %al 2f: e9 90 88 18 09 jmp 0x91888c4 34: cc int3 35: 66 data16 36: 66 data16 37: 66 data16 38: 66 data16 39: 66 data16 3a: 66 data16 3b: 2e cs