8<--- cut here --- Unable to handle kernel paging request at virtual address fee00078 when write [fee00078] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6634 Comm: syz.2.705 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: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 : [<8148f8d4>] lr : [<8148f8c4>] psr: 60000013 sp : dfad5d30 ip : dfad5d30 fp : dfad5d54 r10: 82d30dfc r9 : 00000003 r8 : 8315a180 r7 : dfad5d90 r6 : 8315a180 r5 : 00000000 r4 : 00000000 r3 : fee00078 r2 : 81e2dc88 r1 : 00000001 r0 : 8148f534 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8688e600 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 8315a180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfad4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r8 information: slab kmalloc-192 start 8315a180 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 0xdfad4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xdfad4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.2.705 (pid: 6634, stack limit = 0xdfad4000) Stack: (0xdfad5d30 to 0xdfad6000) 5d20: 824d3c90 8315a180 82bd8e44 82bd8e44 5d40: 81e2e148 00000000 dfad5d8c dfad5d58 8148b450 8148f75c 40946400 00000000 5d60: dfad5d7c 20000600 8315a180 b5403587 40946400 00000003 00000003 84e4b100 5d80: dfad5e4c dfad5d90 81486c54 8148b354 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000078 0000002f 00000000 0000000c 00000008 00000006 00100002 5dc0: 00000007 00000005 00000100 00000004 00000001 00000001 00020003 00000000 5de0: 00000101 00000083 80000000 00000003 00001b18 00000016 00000004 00000000 5e00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 5e20: 00000000 e1c5ade7 00000000 85bd9500 8315a180 20000600 40946400 00000003 5e40: dfad5f14 dfad5e50 81487f7c 81486b94 dfad5e4c e1c5ade7 00000000 00000000 5e60: 8254880c dfad5ea4 0000005f 8430eb68 00000064 8315a1b0 dfad5ee4 dfad5e88 5e80: 808037c4 807f9af4 00000064 00000001 00000000 dfad5ea4 8388d910 834ede58 5ea0: 00006400 0000000b dfad5e98 00000000 dfad5d38 e1c5ade7 00000000 85bd9500 5ec0: 40946400 20000600 20000600 85bd9500 00000003 84e4b100 dfad5ef4 dfad5ee8 5ee0: 808038f8 e1c5ade7 dfad5f14 00000000 85bd9501 40946400 20000600 85bd9500 5f00: 00000003 84e4b100 dfad5fa4 dfad5f18 805ba870 81487c34 ecac8b10 84e4b100 5f20: dfad5f3c dfad5f30 81b52fc0 81b52e8c dfad5f54 dfad5f40 8025a7ac 8028e488 5f40: dfad5fb0 40000000 dfad5f84 dfad5f58 80220bdc 8025a768 00000000 82a1eb0c 5f60: dfad5fb0 0013e9c0 ecac8b10 80220b30 00000000 e1c5ade7 dfad5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84e4b100 00000036 00000000 dfad5fa8 5fa0: 80200060 805ba638 00000000 00000000 00000003 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0f0dc 5fe0: 76f0ee88 76f0ee78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8148f750>] (parport_attach) from [<8148b450>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e148 r4:82bd8e44 [<8148b348>] (comedi_device_attach) from [<81486c54>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84e4b100 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8315a180 r4:20000600 [<81486b88>] (do_devconfig_ioctl) from [<81487f7c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8315a180 r4:85bd9500 [<81487c28>] (comedi_unlocked_ioctl) from [<805ba870>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81487c28>] (comedi_unlocked_ioctl) from [<805ba870>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81487c28>] (comedi_unlocked_ioctl) from [<805ba870>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81487c28>] (comedi_unlocked_ioctl) from [<805ba870>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84e4b100 r9:00000003 r8:85bd9500 r7:20000600 r6:40946400 r5:85bd9501 r4:00000000 [<805ba62c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfad5fa8 to 0xdfad5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0f0dc 5fe0: 76f0ee88 76f0ee78 00018ebc 00130820 r10:00000036 r9:84e4b100 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