8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6402 Comm: syz.0.659 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 : dfa09d38 ip : dfa09d38 fp : dfa09d5c r10: 82b15078 r9 : 00000003 r8 : 84032540 r7 : dfa09d98 r6 : 84032540 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85c9bc80 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 84032540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 84032540 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 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfa08000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.0.659 (pid: 6402, stack limit = 0xdfa08000) Stack: (0xdfa09d38 to 0xdfa0a000) 9d20: 823f8830 84032540 9d40: 829c4ad8 829c4ad8 81e153ec 00000000 dfa09d94 dfa09d60 81393e00 81397be0 9d60: 200000c0 00000000 dfa09d84 200000c0 84032540 b5403587 200000c0 86071800 9d80: 40946400 00000003 dfa09e4c dfa09d98 8138fa90 81393d08 656d6f63 705f6964 9da0: 6f707261 00007472 00000000 00004f27 00000009 00000004 00000004 00000005 9dc0: 00000006 00000006 00000007 0000000a 00000100 00000002 00080003 00000001 9de0: 00000008 0000001e 00000001 00000000 0001a449 00000003 00200006 00000081 9e00: 0000caa7 00000004 00001e58 0000000b 00000003 0000003c 00000008 00000006 9e20: 00000000 00000005 00000000 505af113 00000000 8481be40 84032540 200000c0 9e40: dfa09f14 dfa09e50 81390a44 8138f9c4 00000000 00000000 00000000 505af113 9e60: 00000000 00000000 8246a3fc 0000005f 84202058 84032570 84059a74 86071800 9e80: dfa09ee4 dfa09e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfa09eac 9ea0: 8555c3d0 834e46e8 00006400 0000000b dfa09ea0 00000000 00000000 505af113 9ec0: 8481be40 40946400 200000c0 200000c0 00000003 8481be40 dfa09ef4 dfa09ee8 9ee0: 80795b2c 505af113 dfa09f14 40946400 00000000 8481be41 200000c0 00000003 9f00: 8481be40 86071800 dfa09fa4 dfa09f18 8056e2dc 81390474 ecac8b10 86071800 9f20: dfa09f3c dfa09f30 81a2cd08 81a2cbd8 dfa09f54 dfa09f40 80261ffc 80293598 9f40: dfa09fb0 40000000 dfa09f84 dfa09f58 802229ec 80261fb8 00000000 8281d09c 9f60: dfa09fb0 0014c4a0 ecac8b10 80222940 00000000 505af113 dfa09fac 00000000 9f80: 00000000 002f6300 00000036 8020029c 86071800 00000036 00000000 dfa09fa8 9fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76be00bc 9fe0: 76bdfec0 76bdfeb0 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 r8:86071800 r7:200000c0 r6:b5403587 r5:84032540 r4:200000c0 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:200000c0 r5:84032540 r4:8481be40 [<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) r10:86071800 r9:8481be40 r8:00000003 r7:200000c0 r6:8481be41 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa09fa8 to 0xdfa09ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76be00bc 9fe0: 76bdfec0 76bdfeb0 000193a4 00131f40 r10:00000036 r9:86071800 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