8<--- cut here --- Unable to handle kernel paging request at virtual address fee000f0 when write [fee000f0] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 12570 Comm: syz.5.684 Not tainted 6.16.0-rc4-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 : [<81398ba8>] lr : [<81398b98>] psr: 60000013 sp : ed35dd38 ip : ed35dd38 fp : ed35dd5c r10: 82b15078 r9 : 00000003 r8 : 841490c0 r7 : ed35dd98 r6 : 841490c0 r5 : 00000000 r4 : 00000000 r3 : fee000f0 r2 : 81e14f0c r1 : 00000001 r0 : 81398818 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84e5de80 DAC: fffffffd 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 841490c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xed35c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 841490c0 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 0xed35c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xed35c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.5.684 (pid: 12570, stack limit = 0xed35c000) Stack: (0xed35dd38 to 0xed35e000) dd20: 823f88f8 841490c0 dd40: 829c4b18 829c4b18 81e153cc 00000000 ed35dd94 ed35dd60 81394c60 81398a40 dd60: 20000080 00000000 ed35dd84 20000080 841490c0 b5403587 20000080 85d45400 dd80: 40946400 00000003 ed35de4c ed35dd98 813908f0 81394b68 656d6f63 705f6964 dda0: 6f707261 00007472 00000000 000000f0 80008000 00000001 0000000a 00000000 ddc0: 00000000 10000001 00000001 00001000 00000001 00000008 00000001 00000006 dde0: 00000004 0000ffff 00000006 ffffffa7 00000009 fffffffd 00000005 000003ff de00: 00010000 00000800 0000e2df 00000009 000000ff 00000000 00000003 00000007 de20: 00000005 00000005 00000000 5629a858 00000000 84de6b40 841490c0 20000080 de40: ed35df14 ed35de50 813918a4 81390824 00000000 00000000 00000000 5629a858 de60: 00000000 00000000 8246a3fc 0000005f 83c0c258 841490f0 841dc75c 85d45400 de80: ed35dee4 ed35de90 8079688c 8078cb7c 00000064 00000001 00000000 ed35deac dea0: 85bf8310 834e44c8 00006400 0000000b ed35dea0 00000000 00000000 5629a858 dec0: 84de6b40 40946400 20000080 20000080 00000003 84de6b40 ed35def4 ed35dee8 dee0: 807969ac 5629a858 ed35df14 40946400 00000000 84de6b41 20000080 00000003 df00: 84de6b40 85d45400 ed35dfa4 ed35df18 8056f16c 813912d4 ecac8b10 85d45400 df20: ed35df3c ed35df30 81a2db68 81a2da38 ed35df54 ed35df40 8026203c 802935d8 df40: ed35dfb0 40000000 ed35df84 ed35df58 802229ec 80261ff8 00000000 8281d09c df60: ed35dfb0 0014c4a0 ecac8b10 80222940 00000000 5629a858 ed35dfac 00000000 df80: 00000000 002f6300 00000036 8020029c 85d45400 00000036 00000000 ed35dfa8 dfa0: 80200060 8056f048 00000000 00000000 00000003 40946400 20000080 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b660bc dfe0: 76b65ec0 76b65eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<81398a34>] (parport_attach) from [<81394c60>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153cc r4:829c4b18 [<81394b5c>] (comedi_device_attach) from [<813908f0>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:85d45400 r7:20000080 r6:b5403587 r5:841490c0 r4:20000080 [<81390818>] (do_devconfig_ioctl) from [<813918a4>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000080 r5:841490c0 r4:84de6b40 [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<813912c8>] (comedi_unlocked_ioctl) from [<8056f16c>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:85d45400 r9:84de6b40 r8:00000003 r7:20000080 r6:84de6b41 r5:00000000 r4:40946400 [<8056f03c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xed35dfa8 to 0xed35dff0) dfa0: 00000000 00000000 00000003 40946400 20000080 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b660bc dfe0: 76b65ec0 76b65eb0 000193a4 00131f40 r10:00000036 r9:85d45400 r8:8020029c r7:00000036 r6:002f6300 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