8<--- cut here --- Unable to handle kernel paging request at virtual address fee00ae8 when write [fee00ae8] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5336 Comm: syz.2.327 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81409380>] lr : [<81409370>] psr: 60000013 sp : ea9b1d28 ip : ea9b1d28 fp : ea9b1d4c r10: 82b28ad8 r9 : 00000003 r8 : 84570300 r7 : ea9b1d88 r6 : 84570300 r5 : 00000000 r4 : 00000000 r3 : fee00ae8 r2 : 81e1a318 r1 : 00000001 r0 : 81408ff0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85305800 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 84570300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea9b0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84570300 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 0xea9b0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea9b0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.327 (pid: 5336, stack limit = 0xea9b0000) Stack: (0xea9b1d28 to 0xea9b2000) 1d20: 82433180 84570300 829d3f08 829d3f08 81e1a7d8 84570344 1d40: ea9b1d84 ea9b1d50 8140502c 81409218 84570330 00000000 ea9b1d74 200000c0 1d60: 84570300 b5403587 84570330 85e08c00 40946400 00000003 ea9b1e44 ea9b1d88 1d80: 81400984 81404f30 656d6f63 705f6964 6f707261 00007472 00000000 00000ae8 1da0: 80000000 00000004 00000004 00000005 00000005 00000004 00000007 00000009 1dc0: 000000fd 00000012 00000007 00000002 00000080 00000007 00000101 00000000 1de0: 0000007f 00000004 40000002 00000004 0080caa3 00000000 20001e5b 00000000 1e00: 00000e66 00000003 00000008 00004086 00000000 fffffffc 00000000 1b6f09de 1e20: 00000000 85e79b40 84570300 200000c0 84570330 85e08c00 ea9b1f14 ea9b1e48 1e40: 81401978 81400890 00000000 00000000 00000000 00000000 00000000 1b6f09de 1e60: 00000000 00000000 824a45ec 0000005f 84272838 00000064 841e7f84 85e08c00 1e80: ea9b1ee4 ea9b1e90 807b8180 807ae6a4 00000064 00000001 00000000 ea9b1eac 1ea0: 852ca190 8341eb28 00006400 0000000b ea9b1ea0 00000000 00000000 1b6f09de 1ec0: 85e79b40 40946400 200000c0 200000c0 85e79b40 00000003 ea9b1ef4 ea9b1ee8 1ee0: 807b82a0 1b6f09de ea9b1f14 40946400 00000000 85e79b41 200000c0 85e79b40 1f00: 00000003 85e08c00 ea9b1fa4 ea9b1f18 80585768 814013c8 ecac8b10 85e08c00 1f20: ea9b1f3c ea9b1f30 81ab01ac 81ab007c ea9b1f54 ea9b1f40 8025bcbc 8028e0c4 1f40: ea9b1fb0 40000000 ea9b1f84 ea9b1f58 80221a38 8025bc78 00000000 8281d17c 1f60: ea9b1fb0 0014c8c0 ecac8b10 8022198c 00000000 1b6f09de ea9b1fac 00000000 1f80: 00000000 00326310 00000036 8020029c 85e08c00 00000036 00000000 ea9b1fa8 1fa0: 80200060 80585644 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f830bc 1fe0: 76f82ec0 76f82eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<8140920c>] (parport_attach) from [<8140502c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84570344 r5:81e1a7d8 r4:829d3f08 [<81404f24>] (comedi_device_attach) from [<81400984>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85e08c00 r7:84570330 r6:b5403587 r5:84570300 r4:200000c0 [<81400884>] (do_devconfig_ioctl) from [<81401978>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85e08c00 r7:84570330 r6:200000c0 r5:84570300 r4:85e79b40 [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85e08c00 r9:00000003 r8:85e79b40 r7:200000c0 r6:85e79b41 r5:00000000 r4:40946400 [<80585638>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea9b1fa8 to 0xea9b1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f830bc 1fe0: 76f82ec0 76f82eb0 000192bc 00132360 r10:00000036 r9:85e08c00 r8:8020029c r7:00000036 r6:00326310 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