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: 9444 Comm: syz.3.1357 Not tainted 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 : [<813abeb8>] lr : [<813abea8>] psr: 60000013 sp : dfac1d30 ip : dfac1d30 fp : dfac1d54 r10: 82b16f40 r9 : 00000003 r8 : 840e36c0 r7 : dfac1d90 r6 : 840e36c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15544 r1 : 00000001 r0 : 813abb28 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8562bf00 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 840e36c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfac0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840e36c0 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 0xdfac0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfac0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.3.1357 (pid: 9444, stack limit = 0xdfac0000) Stack: (0xdfac1d30 to 0xdfac2000) 1d20: 823fe884 840e36c0 829cf9ac 829cf9ac 1d40: 81e15a04 840e3704 dfac1d8c dfac1d58 813a7f50 813abd50 200000c0 00000000 1d60: dfac1d7c 200000c0 840e36c0 b5403587 200000c0 83a83c00 40946400 00000003 1d80: dfac1e4c dfac1d90 813a3a9c 813a7e54 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 450e7abe 0000000a 00000006 00000005 00000005 20000000 1dc0: 01000007 54c6cff3 000000fd 00000002 00008401 00000006 5da31c5d 00000006 1de0: 00000100 00000021 00000891 00008000 40000001 00000005 0000caa0 fffffffb 1e00: 20001e5b fffffffd 00000e66 00000080 00000008 0000027e 00000000 fffffff8 1e20: 00000000 0f6b85f0 00000000 85b86480 840e36c0 200000c0 200000c0 83a83c00 1e40: dfac1f14 dfac1e50 813a4a68 813a39a8 00000000 00000000 00000000 0f6b85f0 1e60: 00000000 00000000 8247154c 0000005f 84030858 840e36f0 840dce1c 83a83c00 1e80: dfac1ee4 dfac1e90 80797aa4 8078de08 00000064 00000001 00000000 dfac1eac 1ea0: 850810d0 834d8bb0 00006400 0000000b dfac1ea0 00000000 00000000 0f6b85f0 1ec0: 85b86480 40946400 200000c0 200000c0 85b86480 00000003 dfac1ef4 dfac1ee8 1ee0: 80797bc4 0f6b85f0 dfac1f14 40946400 00000000 85b86481 200000c0 85b86480 1f00: 00000003 83a83c00 dfac1fa4 dfac1f18 8056cdc8 813a4498 ecac8b10 83a83c00 1f20: dfac1f3c dfac1f30 81a3a078 81a39f48 dfac1f54 dfac1f40 8025e490 8028ef6c 1f40: dfac1fb0 40000000 dfac1f84 dfac1f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfac1fb0 0014c7e0 ecac8b10 80222940 00000000 0f6b85f0 dfac1fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 83a83c00 00000036 00000000 dfac1fa8 1fa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f720bc 1fe0: 76f71ec0 76f71eb0 0001946c 00132280 60000010 00000003 00000000 00000000 Call trace: [<813abd44>] (parport_attach) from [<813a7f50>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840e3704 r5:81e15a04 r4:829cf9ac [<813a7e48>] (comedi_device_attach) from [<813a3a9c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83a83c00 r7:200000c0 r6:b5403587 r5:840e36c0 r4:200000c0 [<813a399c>] (do_devconfig_ioctl) from [<813a4a68>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83a83c00 r7:200000c0 r6:200000c0 r5:840e36c0 r4:85b86480 [<813a448c>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a448c>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a448c>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a448c>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83a83c00 r9:00000003 r8:85b86480 r7:200000c0 r6:85b86481 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac1fa8 to 0xdfac1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f720bc 1fe0: 76f71ec0 76f71eb0 0001946c 00132280 r10:00000036 r9:83a83c00 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