8<--- cut here --- Unable to handle kernel paging request at virtual address fee00009 when write [fee00009] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7628 Comm: syz.0.645 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 : dfab5d38 ip : dfab5d38 fp : dfab5d5c r10: 82b15078 r9 : 00000003 r8 : 841893c0 r7 : dfab5d98 r6 : 841893c0 r5 : 00000000 r4 : 00000000 r3 : fee00009 r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85f92500 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 841893c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfab4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 841893c0 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 0xdfab4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfab4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.645 (pid: 7628, stack limit = 0xdfab4000) Stack: (0xdfab5d38 to 0xdfab6000) 5d20: dfab5d54 dfab5d48 5d40: 829c4ad8 829c4ad8 81e153ec 00000000 dfab5d94 dfab5d60 81393e00 81397be0 5d60: 20000280 00000000 dfab5d84 20000280 841893c0 b5403587 20000280 85e26c00 5d80: 40946400 00000000 dfab5e4c dfab5d98 8138fa90 81393d08 656d6f63 705f6964 5da0: 6f707261 00007472 00000000 00000009 00000000 00000002 fffffffe 00008001 5dc0: ffffffff 00000001 00000bba ffffffff 0000ff4b 80000000 00000001 00000000 5de0: fffffe01 00000401 00000001 00000084 00000004 00000007 0000000e 0001fe00 5e00: 00000008 00000008 00000000 00000001 00000008 00000000 0000000b 00000004 5e20: 00007fff 000000b6 00000000 6eae24e5 00000000 8588dc00 841893c0 20000280 5e40: dfab5f14 dfab5e50 81390a44 8138f9c4 00000000 00000000 00000000 6eae24e5 5e60: 00000000 00000000 8246a3fc 0000005f 840de058 841893f0 8419963c 85e26c00 5e80: dfab5ee4 dfab5e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfab5eac 5ea0: 85e5b3d0 8342ebb0 00006400 0000000b dfab5ea0 00000000 00000000 6eae24e5 5ec0: 8588dc00 40946400 20000280 20000280 00000003 8588dc00 dfab5ef4 dfab5ee8 5ee0: 80795b2c 6eae24e5 dfab5f14 40946400 00000000 8588dc01 20000280 00000003 5f00: 8588dc00 85e26c00 dfab5fa4 dfab5f18 8056e2dc 81390474 ecac8b10 85e26c00 5f20: dfab5f3c dfab5f30 81a2cd08 81a2cbd8 dfab5f54 dfab5f40 80261ffc 80293598 5f40: dfab5fb0 40000000 dfab5f84 dfab5f58 802229ec 80261fb8 00000000 8281d09c 5f60: dfab5fb0 0014c4a0 ecac8b10 80222940 00000000 6eae24e5 dfab5fac 00000000 5f80: 00000000 002f6300 00000036 8020029c 85e26c00 00000036 00000000 dfab5fa8 5fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc70bc 5fe0: 76bc6ec0 76bc6eb0 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) r10:00000000 r9:40946400 r8:85e26c00 r7:20000280 r6:b5403587 r5:841893c0 r4:20000280 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000280 r5:841893c0 r4:8588dc00 [<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) r10:85e26c00 r9:8588dc00 r8:00000003 r7:20000280 r6:8588dc01 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfab5fa8 to 0xdfab5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76bc70bc 5fe0: 76bc6ec0 76bc6eb0 000193a4 00131f40 r10:00000036 r9:85e26c00 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