8<--- cut here --- Unable to handle kernel paging request at virtual address fee0000e when write [fee0000e] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 17391 Comm: syz.8.1138 Not tainted 6.16.0-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 : [<813ab000>] lr : [<813aaff0>] psr: 60000013 sp : e04d1d30 ip : e04d1d30 fp : e04d1d54 r10: 82b16f00 r9 : 00000003 r8 : 840b2180 r7 : e04d1d90 r6 : 840b2180 r5 : 00000000 r4 : 00000000 r3 : fee0000e r2 : 81e15444 r1 : 00000001 r0 : 813aac70 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 860e5900 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 840b2180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe04d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840b2180 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 0xe04d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xe04d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.8.1138 (pid: 17391, stack limit = 0xe04d0000) Stack: (0xe04d1d30 to 0xe04d2000) 1d20: 823fe300 840b2180 829cf8ec 829cf8ec 1d40: 81e15904 840b21c4 e04d1d8c e04d1d58 813a7098 813aae98 20000140 00000000 1d60: e04d1d7c 20000140 840b2180 b5403587 20000140 85e48000 40946400 00000002 1d80: e04d1e4c e04d1d90 813a2c18 813a6f9c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 0000000e 00002566 fffffffe 00100000 00000008 00000000 00000005 1dc0: 00000010 00000006 ffffffff 00000001 00000005 00000344 00000000 00000007 1de0: 00000000 00000008 00000003 00000009 0000000e 00010000 00001003 00000006 1e00: 0000000c 00000005 00000001 0000b0c4 000007df 00000008 00400007 00000001 1e20: 00000000 678089f8 00000000 85d69480 840b2180 20000140 20000140 85e48000 1e40: e04d1f14 e04d1e50 813a3be4 813a2b24 00000000 00000000 00000000 678089f8 1e60: 00000000 00000000 8247054c 0000005f 83bae458 840b21b0 8409bd8c 85e48000 1e80: e04d1ee4 e04d1e90 8079794c 8078dcb0 00000064 00000001 00000000 e04d1eac 1ea0: 84dc1550 8342e220 00006400 0000000b e04d1ea0 00000000 00000000 678089f8 1ec0: 85d69480 40946400 20000140 20000140 85d69480 00000003 e04d1ef4 e04d1ee8 1ee0: 80797a6c 678089f8 e04d1f14 40946400 00000000 85d69481 20000140 85d69480 1f00: 00000003 85e48000 e04d1fa4 e04d1f18 8056cf08 813a3614 ecac8b10 85e48000 1f20: e04d1f3c e04d1f30 81a388b8 81a38788 e04d1f54 e04d1f40 8025e490 8028ef8c 1f40: e04d1fb0 40000000 e04d1f84 e04d1f58 802229ec 8025e44c 00000000 8281cddc 1f60: e04d1fb0 0014c820 ecac8b10 80222940 00000000 678089f8 e04d1fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 85e48000 00000036 00000000 e04d1fa8 1fa0: 80200060 8056cde4 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f100bc 1fe0: 76f0fec0 76f0feb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aae8c>] (parport_attach) from [<813a7098>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840b21c4 r5:81e15904 r4:829cf8ec [<813a6f90>] (comedi_device_attach) from [<813a2c18>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000002 r9:40946400 r8:85e48000 r7:20000140 r6:b5403587 r5:840b2180 r4:20000140 [<813a2b18>] (do_devconfig_ioctl) from [<813a3be4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85e48000 r7:20000140 r6:20000140 r5:840b2180 r4:85d69480 [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85e48000 r9:00000003 r8:85d69480 r7:20000140 r6:85d69481 r5:00000000 r4:40946400 [<8056cdd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe04d1fa8 to 0xe04d1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f100bc 1fe0: 76f0fec0 76f0feb0 0001948c 001322c0 r10:00000036 r9:85e48000 r8:8020029c r7:00000036 r6:002f6308 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