8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9219 Comm: syz.3.1343 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:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814954f8>] lr : [<814954ec>] psr: 60000013 sp : dfcbdd30 ip : dfcbdd30 fp : dfcbdd54 r10: 82d30eac r9 : 00000003 r8 : 831d0000 r7 : dfcbdd90 r6 : dfcbdd90 r5 : 831d0000 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86932140 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer 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: slab kmalloc-192 start 831d0000 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 831d0000 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 0xdfcbc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfcbc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.1343 (pid: 9219, stack limit = 0xdfcbc000) Stack: (0xdfcbdd30 to 0xdfcbe000) dd20: ffffffff 00000004 82bd8ea0 81e2e448 dd40: 00000000 dfcbdd90 dfcbdd8c dfcbdd58 81491184 814954a8 40946400 00000000 dd60: dfcbdd7c 200003c0 831d0000 b5403587 40946400 00000002 00000003 840cbd40 dd80: dfcbde4c dfcbdd90 8148c988 81491088 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000140 00000004 0001000c 0000dddc 00000000 00010000 00000001 ddc0: 00000000 00000007 80000000 02000004 0000000f 0000c000 00000008 00000006 dde0: 00008e99 fffffffe 000000ed 00000006 00000008 00000004 ffffffff 00000000 de00: 00000009 00000008 00000009 000000af 00000200 00000283 00007ffd 00000009 de20: 00000000 9e17a0e1 00000000 860a1380 831d0000 200003c0 40946400 00000002 de40: dfcbdf14 dfcbde50 8148dcb0 8148c8c8 00000000 9e17a0e1 00000000 00000000 de60: 8254a844 dfcbdea4 0000005f 8420cd40 00000064 831d0030 dfcbdee4 dfcbde88 de80: 8080692c 807fcfe4 00000064 00000001 00000000 dfcbdea4 8383e810 834f1220 dea0: 00006400 0000000b dfcbde98 00000000 00000000 9e17a0e1 00000000 860a1380 dec0: 40946400 200003c0 200003c0 860a1380 00000003 840cbd40 dfcbdef4 dfcbdee8 dee0: 80806a60 9e17a0e1 dfcbdf14 00000000 860a1381 40946400 200003c0 860a1380 df00: 00000003 840cbd40 dfcbdfa4 dfcbdf18 805bb23c 8148d968 ecac8b10 840cbd40 df20: dfcbdf3c dfcbdf30 81b5c8a0 81b5c76c dfcbdf54 dfcbdf40 8025a7a8 8028e490 df40: dfcbdfb0 40000000 dfcbdf84 dfcbdf58 80220bdc 8025a764 00000000 82a1eb0c df60: dfcbdfb0 0013eb80 ecac8b10 80220b30 00000000 9e17a0e1 dfcbdfac 00000000 df80: 00000000 00356310 00000036 8020029c 840cbd40 00000036 00000000 dfcbdfa8 dfa0: 80200060 805bb004 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f200dc dfe0: 76f1fe88 76f1fe78 00018f80 001309e0 60000010 00000003 00000000 00000000 Call trace: [<8149549c>] (parport_attach) from [<81491184>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfcbdd90 r6:00000000 r5:81e2e448 r4:82bd8ea0 [<8149107c>] (comedi_device_attach) from [<8148c988>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:840cbd40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:831d0000 r4:200003c0 [<8148c8bc>] (do_devconfig_ioctl) from [<8148dcb0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:831d0000 r4:860a1380 [<8148d95c>] (comedi_unlocked_ioctl) from [<805bb23c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d95c>] (comedi_unlocked_ioctl) from [<805bb23c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d95c>] (comedi_unlocked_ioctl) from [<805bb23c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d95c>] (comedi_unlocked_ioctl) from [<805bb23c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840cbd40 r9:00000003 r8:860a1380 r7:200003c0 r6:40946400 r5:860a1381 r4:00000000 [<805baff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcbdfa8 to 0xdfcbdff0) dfa0: 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f200dc dfe0: 76f1fe88 76f1fe78 00018f80 001309e0 r10:00000036 r9:840cbd40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67dca e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67dca bl 0xfed9f730 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction