8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 26651 Comm: syz.2.7855 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 : [<81397d48>] lr : [<81397d38>] psr: 60000013 sp : dfeb1d38 ip : dfeb1d38 fp : dfeb1d5c r10: 82b15078 r9 : 00000003 r8 : 8415b600 r7 : dfeb1d98 r6 : 8415b600 r5 : 00000000 r4 : 00000000 r3 : fee04f2a r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85de3280 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 8415b600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfeb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 8415b600 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 0xdfeb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfeb0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.2.7855 (pid: 26651, stack limit = 0xdfeb0000) Stack: (0xdfeb1d38 to 0xdfeb2000) 1d20: 823f8a14 8415b600 1d40: 829c4ad8 829c4ad8 81e153ec 00000000 dfeb1d94 dfeb1d60 81393e00 81397be0 1d60: 200000c0 00000000 dfeb1d84 200000c0 8415b600 b5403587 200000c0 832fd400 1d80: 40946400 00000003 dfeb1e4c dfeb1d98 8138fa90 81393d08 656d6f63 705f6964 1da0: 6f707261 00007472 00000000 00004f2a 00000002 00000004 00000004 00000005 1dc0: 00000006 00000006 00000007 0000000a 00000100 00000002 00080000 00000001 1de0: 00000008 00001000 00000001 00000000 0001a449 00000003 00000006 00000081 1e00: 0000caa7 00000004 00001e58 fffffbba 02000003 0000003c 00000008 00000006 1e20: 00000000 00000005 00000000 5f58d1ed 00000000 85d44180 8415b600 200000c0 1e40: dfeb1f14 dfeb1e50 81390a44 8138f9c4 00000000 00000000 00000000 5f58d1ed 1e60: 00000000 00000000 8246a3fc 0000005f 83966a58 8415b630 8392aabc 832fd400 1e80: dfeb1ee4 dfeb1e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfeb1eac 1ea0: 85ae50d0 8341c220 00006400 0000000b dfeb1ea0 00000000 00000000 5f58d1ed 1ec0: 85d44180 40946400 200000c0 200000c0 00000003 85d44180 dfeb1ef4 dfeb1ee8 1ee0: 80795b2c 5f58d1ed dfeb1f14 40946400 00000000 85d44181 200000c0 00000003 1f00: 85d44180 832fd400 dfeb1fa4 dfeb1f18 8056e2dc 81390474 ecac8b10 832fd400 1f20: dfeb1f3c dfeb1f30 81a2cd48 81a2cc18 dfeb1f54 dfeb1f40 80261ffc 80293598 1f40: dfeb1fb0 40000000 dfeb1f84 dfeb1f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfeb1fb0 0014c4a0 ecac8b10 80222940 00000000 5f58d1ed dfeb1fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 832fd400 00000036 00000000 dfeb1fa8 1fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76be60bc 1fe0: 76be5ec0 76be5eb0 000193a4 00131f40 60000010 00000003 00000000 00000000 Call trace: [<81397bd4>] (parport_attach) from [<81393e00>] (comedi_device_attach+0x104/0x240 drivers/comedi/drivers.c:996) r6:00000000 r5:81e153ec r4:829c4ad8 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000003 r9:40946400 r8:832fd400 r7:200000c0 r6:b5403587 r5:8415b600 r4:200000c0 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200000c0 r5:8415b600 r4:85d44180 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2dc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:832fd400 r9:85d44180 r8:00000003 r7:200000c0 r6:85d44181 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfeb1fa8 to 0xdfeb1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76be60bc 1fe0: 76be5ec0 76be5eb0 000193a4 00131f40 r10:00000036 r9:832fd400 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