8<--- cut here --- Unable to handle kernel paging request at virtual address fee00008 when write [fee00008] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 11309 Comm: syz.4.1306 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [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 : [<81491384>] lr : [<81491374>] psr: 60000013 sp : dfc41d30 ip : dfc41d30 fp : dfc41d54 r10: 82d30dfc r9 : 00000003 r8 : 842bd480 r7 : dfc41d90 r6 : 842bd480 r5 : 00000000 r4 : 00000000 r3 : fee00008 r2 : 81e2dc88 r1 : 00000001 r0 : 81490fe4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86dc8bc0 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 842bd480 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r8 information: slab kmalloc-192 start 842bd480 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 0xdfc40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xdfc40000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.4.1306 (pid: 11309, stack limit = 0xdfc40000) Stack: (0xdfc41d30 to 0xdfc42000) 1d20: ffffffff 00000004 82bd8e44 82bd8e44 1d40: 81e2e148 00000000 dfc41d8c dfc41d58 8148cefc 8149120c 40946400 00000000 1d60: dfc41d7c 200003c0 842bd480 b5403587 40946400 00000002 00000003 83950c40 1d80: dfc41e4c dfc41d90 81488700 8148ce00 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000008 00000000 0000000d 00000002 00000002 00000004 02000004 1dc0: 000000b9 00000007 8002c72d 0000ffff 00000005 00002009 00000008 000004ce 1de0: 00009e9b 0000fae8 00000006 00000006 00000001 00000007 00000006 00000003 1e00: 00000009 00000001 80000001 000000af 00000000 00000283 00008000 00000004 1e20: 00000000 1ebb4c1e 00000000 86bef200 842bd480 200003c0 40946400 00000002 1e40: dfc41f14 dfc41e50 81489a28 81488640 00000000 1ebb4c1e 00000000 00000000 1e60: 8254880c dfc41ea4 0000005f 8431eb68 00000064 842bd4b0 dfc41ee4 dfc41e88 1e80: 80804fa4 807fb2d4 00000064 00000001 00000000 dfc41ea4 85bc3110 83426000 1ea0: 00006400 0000000b dfc41e98 00000000 00000000 1ebb4c1e 00000000 86bef200 1ec0: 40946400 200003c0 200003c0 86bef200 00000003 83950c40 dfc41ef4 dfc41ee8 1ee0: 808050d8 1ebb4c1e dfc41f14 00000000 86bef201 40946400 200003c0 86bef200 1f00: 00000003 83950c40 dfc41fa4 dfc41f18 805ba7a0 814896e0 ecac8b10 83950c40 1f20: dfc41f3c dfc41f30 81b54a80 81b5494c dfc41f54 dfc41f40 8025a7ac 8028e488 1f40: dfc41fb0 40000000 dfc41f84 dfc41f58 80220bdc 8025a768 00000000 82a1eb0c 1f60: dfc41fb0 0013e9c0 ecac8b10 80220b30 00000000 1ebb4c1e dfc41fac 00000000 1f80: 00000000 00356310 00000036 8020029c 83950c40 00000036 00000000 dfc41fa8 1fa0: 80200060 805ba568 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f730dc 1fe0: 76f72e88 76f72e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81491200>] (parport_attach) from [<8148cefc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e148 r4:82bd8e44 [<8148cdf4>] (comedi_device_attach) from [<81488700>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83950c40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:842bd480 r4:200003c0 [<81488634>] (do_devconfig_ioctl) from [<81489a28>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:842bd480 r4:86bef200 [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814896d4>] (comedi_unlocked_ioctl) from [<805ba7a0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83950c40 r9:00000003 r8:86bef200 r7:200003c0 r6:40946400 r5:86bef201 r4:00000000 [<805ba55c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc41fa8 to 0xdfc41ff0) 1fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f730dc 1fe0: 76f72e88 76f72e78 00018ebc 00130820 r10:00000036 r9:83950c40 r8:8020029c r7:00000036 r6:00356310 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