8<--- cut here --- Unable to handle kernel paging request at virtual address fee10000 when write [fee10000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 16821 Comm: syz.1.2060 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<8145bac4>] lr : [<8145bab4>] psr: 60000013 sp : ea545d30 ip : ea545d30 fp : ea545d54 r10: 82d29754 r9 : 00000003 r8 : 846ecb40 r7 : ea545d90 r6 : 846ecb40 r5 : 00000000 r4 : 00000000 r3 : fee10000 r2 : 81e27328 r1 : 00000001 r0 : 8145b724 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8c29a2c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 846ecb40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea544000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r8 information: slab kmalloc-192 start 846ecb40 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 0xea544000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xea544000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.1.2060 (pid: 16821, stack limit = 0xea544000) Stack: (0xea545d30 to 0xea546000) 5d20: 824bcc80 846ecb40 00000000 82bd2368 5d40: 81e277e8 00000000 ea545d8c ea545d58 81457640 8145b94c 40946400 00000000 5d60: ea545d7c 20000140 846ecb40 b5403587 40946400 00000000 00000004 84537080 5d80: ea545e4c ea545d90 81452e4c 81457544 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00010000 0000e004 7fffffff 00000008 0000002f 00002006 000000f1 5dc0: 00000008 00080ffa 08000002 00000000 00008500 00001003 01000004 0000000f 5de0: 00010000 ffffffa8 7ffffffd 0000007f 000009ea 00000010 00040000 00000008 5e00: 00000005 00000401 00000008 00002005 00000008 00000000 00000003 00007ffd 5e20: 00000000 050be17a 00000000 83f5a000 846ecb40 20000140 40946400 00000000 5e40: ea545f14 ea545e50 81454170 81452d84 00000000 050be17a 00000000 00000000 5e60: 82531804 ea545ea4 0000005f 8415e230 00000064 846ecb70 ea545ee4 ea545e88 5e80: 807eaa84 807e0d98 00000064 00000001 00000000 ea545ea4 85f89b50 8342e198 5ea0: 00006400 0000000b ea545e98 00000000 00000000 050be17a 00000000 83f5a000 5ec0: 40946400 20000140 20000140 83f5a000 00000004 84537080 ea545ef4 ea545ee8 5ee0: 807eabb8 050be17a ea545f14 00000000 83f5a001 40946400 20000140 83f5a000 5f00: 00000004 84537080 ea545fa4 ea545f18 805a2310 81453e28 ecac8b10 84537080 5f20: ea545f3c ea545f30 81b1b854 81b1b720 ea545f54 ea545f40 8025a6ac 8028e2e4 5f40: ea545fb0 40000000 ea545f84 ea545f58 80220be0 8025a668 00000000 82a1c63c 5f60: ea545fb0 0013e9b0 ecac8b10 80220b34 00000000 050be17a ea545fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84537080 00000036 00000000 ea545fa8 5fa0: 80200060 805a20d8 00000000 00000000 00000004 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fff0dc 5fe0: 76ffee88 76ffee78 00018ebc 00130810 60000010 00000004 00000000 00000000 Call trace: [<8145b940>] (parport_attach) from [<81457640>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e277e8 r4:82bd2368 [<81457538>] (comedi_device_attach) from [<81452e4c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84537080 r9:00000004 r8:00000000 r7:40946400 r6:b5403587 r5:846ecb40 r4:20000140 [<81452d78>] (do_devconfig_ioctl) from [<81454170>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000000 r7:40946400 r6:20000140 r5:846ecb40 r4:83f5a000 [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453e1c>] (comedi_unlocked_ioctl) from [<805a2310>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84537080 r9:00000004 r8:83f5a000 r7:20000140 r6:40946400 r5:83f5a001 r4:00000000 [<805a20cc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea545fa8 to 0xea545ff0) 5fa0: 00000000 00000000 00000004 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fff0dc 5fe0: 76ffee88 76ffee78 00018ebc 00130810 r10:00000036 r9:84537080 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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