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: 7752 Comm: syz.1.853 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 : [<8144de6c>] lr : [<8144de5c>] psr: 60000013 sp : dfa85d30 ip : dfa85d30 fp : dfa85d54 r10: 82d2bdc4 r9 : 00000003 r8 : 846e86c0 r7 : dfa85d90 r6 : 846e86c0 r5 : 00000000 r4 : 00000000 r3 : fee009e0 r2 : 81e27468 r1 : 00000001 r0 : 8144dacc Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 863f6140 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 846e86c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 846e86c0 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 0xdfa84000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2721 Process syz.1.853 (pid: 7752, stack limit = 0xdfa84000) Stack: (0xdfa85d30 to 0xdfa86000) 5d20: 824ba914 846e86c0 00000000 82bd27a0 5d40: 81e27928 00000000 dfa85d8c dfa85d58 814499cc 8144dcf4 40946400 00000000 5d60: dfa85d7c 20000140 846e86c0 b5403587 40946400 00000002 00000003 833f4980 5d80: dfa85e4c dfa85d90 814451d8 814498d0 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 000009e0 00000005 fffffffe 00000001 00000008 00000000 00000005 5dc0: 00000010 00000fff ffffffff 00000001 00000205 00000344 00000001 00004007 5de0: 00007ff8 00000f0a 00000003 ffffffff 0000000e 00000100 00000006 00000007 5e00: 00080007 00000005 00000001 0000b0c4 000007df 00000009 00400007 00000001 5e20: 00000000 45b26054 00000000 8529ea00 846e86c0 20000140 40946400 00000002 5e40: dfa85f14 dfa85e50 814464fc 81445110 00000000 45b26054 00000000 00000000 5e60: 8252f804 dfa85ea4 0000005f 841c94a0 00000064 846e86f0 dfa85ee4 dfa85e88 5e80: 807df0b0 807d53c4 00000064 00000001 00000000 dfa85ea4 dfa85f14 dfa85ea8 5ea0: 80200bec 81ad366c 8529ea00 40946400 20000140 80456f28 8529ea00 40946400 5ec0: 20000140 20000140 8529ea00 00000003 833f4980 dfa85f14 00000000 dfa85ef8 5ee0: 807b7194 45b26054 dfa85f14 00000000 8529ea01 40946400 20000140 8529ea00 5f00: 00000003 833f4980 dfa85fa4 dfa85f18 8059c1ac 814461b4 ecac8b10 833f4980 5f20: dfa85f3c dfa85f30 81b074b4 81b07380 dfa85f54 dfa85f40 8025a49c 8028c280 5f40: dfa85fb0 40000000 dfa85f84 dfa85f58 80220be0 8025a458 00000000 82a1c2fc 5f60: dfa85fb0 0013e940 ecac8b10 80220b34 00000000 45b26054 dfa85fac 00000000 5f80: 00000000 00346310 00000036 8020029c 833f4980 00000036 00000000 dfa85fa8 5fa0: 80200060 8059bf74 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 5fe0: 76fade88 76fade78 00018e58 001307a0 60000010 00000003 00000000 00000000 Call trace: [<8144dce8>] (parport_attach) from [<814499cc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27928 r4:82bd27a0 [<814498c4>] (comedi_device_attach) from [<814451d8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:833f4980 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:846e86c0 r4:20000140 [<81445104>] (do_devconfig_ioctl) from [<814464fc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:20000140 r5:846e86c0 r4:8529ea00 [<814461a8>] (comedi_unlocked_ioctl) from [<8059c1ac>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814461a8>] (comedi_unlocked_ioctl) from [<8059c1ac>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814461a8>] (comedi_unlocked_ioctl) from [<8059c1ac>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814461a8>] (comedi_unlocked_ioctl) from [<8059c1ac>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:833f4980 r9:00000003 r8:8529ea00 r7:20000140 r6:40946400 r5:8529ea01 r4:00000000 [<8059bf68>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa85fa8 to 0xdfa85ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fae0dc 5fe0: 76fade88 76fade78 00018e58 001307a0 r10:00000036 r9:833f4980 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