8<--- cut here --- Unable to handle kernel paging request at virtual address fee004f0 when write [fee004f0] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 22075 Comm: syz.3.4819 Not tainted 6.16.0-rc5-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 : [<81398300>] lr : [<813982f0>] psr: 60000013 sp : dfd1dd38 ip : dfd1dd38 fp : dfd1dd5c r10: 82b15078 r9 : 00000003 r8 : 841840c0 r7 : dfd1dd98 r6 : 841840c0 r5 : 00000000 r4 : 00000000 r3 : fee004f0 r2 : 81e14f0c r1 : 00000001 r0 : 81397f70 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84e75700 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 841840c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 841840c0 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 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfd1c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.3.4819 (pid: 22075, stack limit = 0xdfd1c000) Stack: (0xdfd1dd38 to 0xdfd1e000) dd20: 823f8db8 841840c0 dd40: 829c4c58 829c4c58 81e153cc 00000000 dfd1dd94 dfd1dd60 813943b8 81398198 dd60: 200002c0 00000000 dfd1dd84 200002c0 841840c0 b5403587 200002c0 8425d400 dd80: 40946400 00000003 dfd1de4c dfd1dd98 81390048 813942c0 656d6f63 705f6964 dda0: 6f707261 00007472 00000000 000004f0 00000008 00000003 00000006 00000006 ddc0: 00000001 00000000 00000009 000000d7 00000005 00000005 00000008 fffffffe dde0: 0000f408 00000003 00000000 0000000a 00020005 00000004 00000008 0000079b de00: 2b5cf81d 00000009 0000a7b1 00000000 0000000b 00000007 00000f7f 0000004d de20: 0000000c 00000007 00000000 d2afebdd dfd1de50 860abf00 841840c0 200002c0 de40: dfd1df14 dfd1de50 81390ffc 8138ff7c 00000000 00000000 00000000 d2afebdd de60: 00000000 00000000 8246a3fc 0000005f 83ca9458 841840f0 8428875c 8425d400 de80: dfd1dee4 dfd1de90 80795d4c 8078c03c 00000064 00000001 00000000 dfd1deac dea0: 84a270d0 83436d48 00006400 0000000b dfd1dea0 00000000 00000000 d2afebdd dec0: 860abf00 40946400 200002c0 200002c0 00000003 860abf00 dfd1def4 dfd1dee8 dee0: 80795e6c d2afebdd dfd1df14 40946400 00000000 860abf01 200002c0 00000003 df00: 860abf00 8425d400 dfd1dfa4 dfd1df18 8056e2ec 81390a2c ecac8b10 8425d400 df20: dfd1df3c dfd1df30 81a2d68c 81a2d55c dfd1df54 dfd1df40 80261ffc 80293598 df40: dfd1dfb0 40000000 dfd1df84 dfd1df58 802229ec 80261fb8 00000000 8281d09c df60: dfd1dfb0 0014c4a0 ecac8b10 80222940 00000000 d2afebdd dfd1dfac 00000000 df80: 00000000 002f6300 00000036 8020029c 8425d400 00000036 00000000 dfd1dfa8 dfa0: 80200060 8056e1c8 00000000 00000000 00000003 40946400 200002c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bab0bc dfe0: 76baaec0 76baaeb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<8139818c>] (parport_attach) from [<813943b8>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153cc r4:829c4c58 [<813942b4>] (comedi_device_attach) from [<81390048>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:8425d400 r7:200002c0 r6:b5403587 r5:841840c0 r4:200002c0 [<8138ff70>] (do_devconfig_ioctl) from [<81390ffc>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200002c0 r5:841840c0 r4:860abf00 [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390a20>] (comedi_unlocked_ioctl) from [<8056e2ec>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:8425d400 r9:860abf00 r8:00000003 r7:200002c0 r6:860abf01 r5:00000000 r4:40946400 [<8056e1bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd1dfa8 to 0xdfd1dff0) dfa0: 00000000 00000000 00000003 40946400 200002c0 00000000 dfc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bab0bc dfe0: 76baaec0 76baaeb0 000193a4 00131f40 r10:00000036 r9:8425d400 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