8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 11891 Comm: syz.3.2167 Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813aaaf8>] lr : [<813aaae8>] psr: 60000013 sp : dfa85d30 ip : dfa85d30 fp : dfa85d54 r10: 82b16f00 r9 : 00000003 r8 : 83ceec00 r7 : dfa85d90 r6 : 83ceec00 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15424 r1 : 00000001 r0 : 813aa768 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85761280 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 83ceec00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83ceec00 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.3.2167 (pid: 11891, stack limit = 0xdfa84000) Stack: (0xdfa85d30 to 0xdfa86000) 5d20: 823fe2a8 83ceec00 829cf8ec 829cf8ec 5d40: 81e158e4 83ceec44 dfa85d8c dfa85d58 813a6b90 813aa990 b5403587 00000000 5d60: 874ad400 200000c0 83ceec00 b5403587 200000c0 874ad400 40946400 00000003 5d80: dfa85e4c dfa85d90 813a2710 813a6a94 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 00000002 00000004 00000006 00000005 00000005 00000004 5dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 5de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000000 5e00: 20001e5b 00000000 00000e66 00000004 00000008 00004086 00000000 fffffff8 5e20: 00000000 04b5352a 813a3148 8b8d0c00 83ceec00 200000c0 200000c0 874ad400 5e40: dfa85f14 dfa85e50 813a36dc 813a261c 00000000 00000000 00000000 04b5352a 5e60: 00000000 00000000 8247054c 0000005f 84111658 83ceec30 8421048c 874ad400 5e80: dfa85ee4 dfa85e90 80797804 8078db68 00000064 00000001 00000000 dfa85eac 5ea0: 85899f10 83431bb0 00006400 0000000b dfa85ea0 00000000 dfa85fa4 dfa85ec8 5ec0: 80200bec 81a06b8c 00000000 40946400 80811501 84111658 40946400 00000000 5ee0: 8b8d0c01 04b5352a 8b8d0c00 40946400 00000000 8b8d0c01 200000c0 8b8d0c00 5f00: 00000003 874ad400 dfa85fa4 dfa85f18 8056ce5c 813a310c ecac8b10 874ad400 5f20: dfa85f3c dfa85f30 81a382f8 81a381c8 dfa85f54 dfa85f40 8025e490 8028ef8c 5f40: dfa85fb0 40000000 dfa85f84 dfa85f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfa85fb0 0014c820 ecac8b10 80222940 00000000 04b5352a dfa85fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 874ad400 00000036 00000000 dfa85fa8 5fa0: 80200060 8056cd38 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f660bc 5fe0: 76f65ec0 76f65eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aa984>] (parport_attach) from [<813a6b90>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:83ceec44 r5:81e158e4 r4:829cf8ec [<813a6a88>] (comedi_device_attach) from [<813a2710>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:874ad400 r7:200000c0 r6:b5403587 r5:83ceec00 r4:200000c0 [<813a2610>] (do_devconfig_ioctl) from [<813a36dc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:874ad400 r7:200000c0 r6:200000c0 r5:83ceec00 r4:8b8d0c00 [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:874ad400 r9:00000003 r8:8b8d0c00 r7:200000c0 r6:8b8d0c01 r5:00000000 r4:40946400 [<8056cd2c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa85fa8 to 0xdfa85ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f660bc 5fe0: 76f65ec0 76f65eb0 0001948c 001322c0 r10:00000036 r9:874ad400 r8:8020029c r7:00000036 r6:002f6308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction