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: 0 UID: 0 PID: 7097 Comm: syz.2.675 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 : dfc75d38 ip : dfc75d38 fp : dfc75d5c r10: 82b15078 r9 : 00000003 r8 : 841fd300 r7 : dfc75d98 r6 : 841fd300 r5 : 00000000 r4 : 00000000 r3 : fee00001 r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 849be180 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 841fd300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc74000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 841fd300 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 0xdfc74000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfc74000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.2.675 (pid: 7097, stack limit = 0xdfc74000) Stack: (0xdfc75d38 to 0xdfc76000) 5d20: 823f8a14 841fd300 5d40: 829c4c58 829c4c58 81e153ec 00000000 dfc75d94 dfc75d60 81393e00 81397be0 5d60: 20000140 00000000 dfc75d84 20000140 841fd300 b5403587 20000140 85428000 5d80: 40946400 00000002 dfc75e4c dfc75d98 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 81720891 00000000 8570cd80 841fd300 20000140 5e40: dfc75f14 dfc75e50 81390a44 8138f9c4 00000000 00000000 00000000 81720891 5e60: 00000000 00000000 8246a3fc 0000005f 8401be58 841fd330 83ec8834 85428000 5e80: dfc75ee4 dfc75e90 80795a14 8078bd04 00000064 00000001 00000000 dfc75eac 5ea0: 86082c10 834236e8 00006400 0000000b dfc75ea0 00000000 00000000 81720891 5ec0: 8570cd80 40946400 20000140 20000140 00000003 8570cd80 dfc75ef4 dfc75ee8 5ee0: 80795b34 81720891 dfc75f14 40946400 00000000 8570cd81 20000140 00000003 5f00: 8570cd80 85428000 dfc75fa4 dfc75f18 8056e2cc 81390474 ecac8b10 85428000 5f20: dfc75f3c dfc75f30 81a2cd48 81a2cc18 dfc75f54 dfc75f40 80261ffc 80293598 5f40: dfc75fb0 40000000 dfc75f84 dfc75f58 802229ec 80261fb8 00000000 8281d09c 5f60: dfc75fb0 0014c4a0 ecac8b10 80222940 00000000 81720891 dfc75fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 85428000 00000036 00000000 dfc75fa8 5fa0: 80200060 8056e1a8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b110bc 5fe0: 76b10ec0 76b10eb0 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 r8:85428000 r7:20000140 r6:b5403587 r5:841fd300 r4:20000140 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000140 r5:841fd300 r4:8570cd80 [<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) r10:85428000 r9:8570cd80 r8:00000003 r7:20000140 r6:8570cd81 r5:00000000 r4:40946400 [<8056e19c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc75fa8 to 0xdfc75ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b110bc 5fe0: 76b10ec0 76b10eb0 000193a4 00131f40 r10:00000036 r9:85428000 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