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: 0 UID: 0 PID: 3796 Comm: syz.1.3 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 : dfda1d38 ip : dfda1d38 fp : dfda1d5c r10: 82b15078 r9 : 00000003 r8 : 83fc9180 r7 : dfda1d98 r6 : 83fc9180 r5 : 00000000 r4 : 00000000 r3 : fee00009 r2 : 81e14f2c r1 : 00000001 r0 : 813979b8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8595be00 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 83fc9180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfda0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r8 information: slab kmalloc-192 start 83fc9180 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 0xdfda0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Register r12 information: 2-page vmalloc region starting at 0xdfda0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2599 Process syz.1.3 (pid: 3796, stack limit = 0xdfda0000) Stack: (0xdfda1d38 to 0xdfda2000) 1d20: 82b15078 dfda1d94 1d40: 829c4ad8 829c4ad8 81e153ec 00000000 dfda1d94 dfda1d60 81393e00 81397be0 1d60: 20000280 00000000 dfda1d84 20000280 83fc9180 b5403587 20000280 8566a400 1d80: 40946400 00000000 dfda1e4c dfda1d98 8138fa90 81393d08 656d6f63 705f6964 1da0: 6f707261 00007472 00000000 00000009 00000000 00000002 fffffffe 00008001 1dc0: ffffffff 00000001 00000bba ffffffff 0000ff4b 80000000 00000001 00000000 1de0: fffffe01 00000401 00000001 00000084 00000004 00000007 0000000e 0001fe00 1e00: 00000008 00000008 00000000 00000001 00000008 00000000 0000000b 00000004 1e20: 00007fff 000000b6 00000000 dcac18fd 00000000 84d986c0 83fc9180 20000280 1e40: dfda1f14 dfda1e50 81390a44 8138f9c4 00000000 00000000 00000000 dcac18fd 1e60: 00000000 00000000 8246a3fc 0000005f 83e37c58 83fc91b0 8429c714 8566a400 1e80: dfda1ee4 dfda1e90 80795a0c 8078bcfc 00000064 00000001 00000000 dfda1eac 1ea0: 849f7490 834d9880 00006400 0000000b dfda1ea0 00000000 00000000 dcac18fd 1ec0: 84d986c0 40946400 20000280 20000280 00000003 84d986c0 dfda1ef4 dfda1ee8 1ee0: 80795b2c dcac18fd dfda1f14 40946400 00000000 84d986c1 20000280 00000003 1f00: 84d986c0 8566a400 dfda1fa4 dfda1f18 8056e2dc 81390474 ecac8b10 8566a400 1f20: dfda1f3c dfda1f30 81a2cd08 81a2cbd8 dfda1f54 dfda1f40 80261ffc 80293598 1f40: dfda1fb0 40000000 dfda1f84 dfda1f58 802229ec 80261fb8 00000000 8281d09c 1f60: dfda1fb0 0014c4a0 ecac8b10 80222940 00000000 dcac18fd dfda1fac 00000000 1f80: 00000000 002f6300 00000036 8020029c 8566a400 00000036 00000000 dfda1fa8 1fa0: 80200060 8056e1b8 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b610bc 1fe0: 76b60ec0 76b60eb0 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 r8:8566a400 r7:20000280 r6:b5403587 r5:83fc9180 r4:20000280 [<8138f9b8>] (do_devconfig_ioctl) from [<81390a44>] (comedi_unlocked_ioctl+0x5dc/0x1b94 drivers/comedi/comedi_fops.c:2136) r6:20000280 r5:83fc9180 r4:84d986c0 [<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) r10:8566a400 r9:84d986c0 r8:00000003 r7:20000280 r6:84d986c1 r5:00000000 r4:40946400 [<8056e1ac>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfda1fa8 to 0xdfda1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000280 00000000 1fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b610bc 1fe0: 76b60ec0 76b60eb0 000193a4 00131f40 r10:00000036 r9:8566a400 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