8<--- cut here --- Unable to handle kernel paging request at virtual address fee009e0 when write [fee009e0] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4657 Comm: syz.0.291 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 : [<8144ddac>] lr : [<8144dd9c>] psr: 60000013 sp : ea681d30 ip : ea681d30 fp : ea681d54 r10: 82d2bdc4 r9 : 00000003 r8 : 8301b6c0 r7 : ea681d90 r6 : 8301b6c0 r5 : 00000000 r4 : 00000000 r3 : fee009e0 r2 : 81e27468 r1 : 00000001 r0 : 8144da0c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8640e880 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 8301b6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea680000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301b6c0 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 0xea680000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea680000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.0.291 (pid: 4657, stack limit = 0xea680000) Stack: (0xea681d30 to 0xea682000) 1d20: 824ba918 8301b6c0 00000000 82bd27a0 1d40: 81e27928 00000000 ea681d8c ea681d58 8144990c 8144dc34 40946400 00000000 1d60: ea681d7c 20000140 8301b6c0 b5403587 40946400 00000002 00000003 846c9880 1d80: ea681e4c ea681d90 81445118 81449810 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 000009e0 00000005 fffffffe 00000001 00000008 00000000 00000005 1dc0: 00000010 00000fff ffffffff 00000001 00000205 00000344 00000001 00004007 1de0: 00007ff8 00000f0a 00000003 ffffffff 0000000e 00000100 00000006 00000007 1e00: 00080007 00000005 00000001 0000b0c4 000007df 00000009 00400007 00000001 1e20: 00000000 79b460d8 00000000 84eb6200 8301b6c0 20000140 40946400 00000002 1e40: ea681f14 ea681e50 8144643c 81445050 00000000 79b460d8 00000000 00000000 1e60: 8252f804 ea681ea4 0000005f 84776408 00000064 8301b6f0 ea681ee4 ea681e88 1e80: 807df020 807d5334 00000064 00000001 00000000 ea681ea4 8383fe50 8342b5d8 1ea0: 00006400 0000000b ea681e98 00000000 00000000 79b460d8 00000000 84eb6200 1ec0: 40946400 20000140 20000140 84eb6200 00000003 846c9880 ea681ef4 ea681ee8 1ee0: 807df154 79b460d8 ea681f14 00000000 84eb6201 40946400 20000140 84eb6200 1f00: 00000003 846c9880 ea681fa4 ea681f18 8059c11c 814460f4 ecac8b10 846c9880 1f20: ea681f3c ea681f30 81b073f4 81b072c0 ea681f54 ea681f40 8025a49c 8028c27c 1f40: ea681fb0 40000000 ea681f84 ea681f58 80220be0 8025a458 00000000 82a1c2fc 1f60: ea681fb0 0013e940 ecac8b10 80220b34 00000000 79b460d8 ea681fac 00000000 1f80: 00000000 00346310 00000036 8020029c 846c9880 00000036 00000000 ea681fa8 1fa0: 80200060 8059bee4 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3a0dc 1fe0: 76f39e88 76f39e78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8144dc28>] (parport_attach) from [<8144990c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27928 r4:82bd27a0 [<81449804>] (comedi_device_attach) from [<81445118>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:846c9880 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301b6c0 r4:20000140 [<81445044>] (do_devconfig_ioctl) from [<8144643c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:20000140 r5:8301b6c0 r4:84eb6200 [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814460e8>] (comedi_unlocked_ioctl) from [<8059c11c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:846c9880 r9:00000003 r8:84eb6200 r7:20000140 r6:40946400 r5:84eb6201 r4:00000000 [<8059bed8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea681fa8 to 0xea681ff0) 1fa0: 00000000 00000000 00000003 40946400 20000140 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f3a0dc 1fe0: 76f39e88 76f39e78 00018e58 001307a0 r10:00000036 r9:846c9880 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