8<--- cut here --- Unable to handle kernel paging request at virtual address fee00001 when write [fee00001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4317 Comm: syz.0.101 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 : dfbd5d38 ip : dfbd5d38 fp : dfbd5d5c r10: 82b15078 r9 : 00000003 r8 : 841e6240 r7 : dfbd5d98 r6 : 841e6240 r5 : 00000000 r4 : 00000000 r3 : fee00001 r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 858d46c0 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 841e6240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 841e6240 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 0xdfbd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfbd4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.101 (pid: 4317, stack limit = 0xdfbd4000) Stack: (0xdfbd5d38 to 0xdfbd6000) 5d20: 823f8a14 841e6240 5d40: 829c4c58 829c4c58 81e153ec 00000000 dfbd5d94 dfbd5d60 81393e00 81397be0 5d60: 20000140 00000000 dfbd5d84 20000140 841e6240 b5403587 20000140 83a98c00 5d80: 40946400 00000002 dfbd5e4c dfbd5d98 8138fa90 81393d08 656d6f63 705f6964 5da0: 6f707261 00007472 00000000 00000001 00000005 00000000 00000002 000088d7 5dc0: 0000008f 00001007 00000010 00001002 ffffffff 00000200 00000007 10000009 5de0: 00000001 00000005 00000001 00000008 00000003 00000009 0000000e 00000108 5e00: 00000003 00000007 0000100a 00000005 00000001 0000b0c4 0000000c 00000008 5e20: 00400002 00000002 00000000 81698dc7 00000000 84ca8a80 841e6240 20000140 5e40: dfbd5f14 dfbd5e50 81390a44 8138f9c4 00000000 00000000 00000000 81698dc7 5e60: 00000000 00000000 8246a3fc 0000005f 83f19258 841e6270 8428b564 83a98c00 5e80: dfbd5ee4 dfbd5e90 80795a14 8078bd04 00000064 00000001 00000000 dfbd5eac 5ea0: 85929550 835b7660 00006400 0000000b dfbd5ea0 00000000 00000000 81698dc7 5ec0: 84ca8a80 40946400 20000140 20000140 00000003 84ca8a80 dfbd5ef4 dfbd5ee8 5ee0: 80795b34 81698dc7 dfbd5f14 40946400 00000000 84ca8a81 20000140 00000003 5f00: 84ca8a80 83a98c00 dfbd5fa4 dfbd5f18 8056e2cc 81390474 ecac8b10 83a98c00 5f20: dfbd5f3c dfbd5f30 81a2cd48 81a2cc18 dfbd5f54 dfbd5f40 80261ffc 80293598 5f40: dfbd5fb0 40000000 dfbd5f84 dfbd5f58 802229ec 80261fb8 00000000 8281d09c 5f60: dfbd5fb0 0014c4a0 ecac8b10 80222940 00000000 81698dc7 dfbd5fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 83a98c00 00000036 00000000 dfbd5fa8 5fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b490bc 5fe0: 76b48ec0 76b48eb0 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 r4:829c4c58 [<81393cfc>] (comedi_device_attach) from [<8138fa90>] (do_devconfig_ioctl+0xd8/0x1e0 drivers/comedi/comedi_fops.c:855) r10:00000002 r9:40946400 r8:83a98c00 r7:20000140 r6:b5403587 r5:841e6240 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:841e6240 r4:84ca8a80 [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (do_vfs_ioctl fs/ioctl.c:861 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (__do_sys_ioctl fs/ioctl.c:905 [inline]) [<81390468>] (comedi_unlocked_ioctl) from [<8056e2cc>] (sys_ioctl+0x130/0xdc8 fs/ioctl.c:893) r10:83a98c00 r9:84ca8a80 r8:00000003 r7:20000140 r6:84ca8a81 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbd5fa8 to 0xdfbd5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b490bc 5fe0: 76b48ec0 76b48eb0 000193a4 00131f40 r10:00000036 r9:83a98c00 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