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: 15594 Comm: syz.7.2854 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 : [<81496e70>] lr : [<81496e64>] psr: 60000013 sp : dfba1d30 ip : dfba1d30 fp : dfba1d54 r10: 82d31eb4 r9 : 00000003 r8 : 83936540 r7 : dfba1d90 r6 : dfba1d90 r5 : 83936540 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: 860c1a00 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 83936540 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfba0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdfba0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 83936540 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 0xdfba0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfba0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.7.2854 (pid: 15594, stack limit = 0xdfba0000) Stack: (0xdfba1d30 to 0xdfba2000) 1d20: ffffffff 00000004 82bd92a4 81e2e4c8 1d40: 00000000 dfba1d90 dfba1d8c dfba1d58 81492b00 81496e20 40946400 00000000 1d60: dfba1d7c 200003c0 83936540 b5403587 40946400 00000002 00000003 8497a4c0 1d80: dfba1e4c dfba1d90 8148e304 81492a04 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 000000bd 00007fff 1dc0: 00000002 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 1de0: 00008e99 80000001 000000ed 00003800 00000008 00000004 00000000 0800000a 1e00: 00000009 00004ffd 00000009 000000b1 00000009 00000281 00008001 0000e43f 1e20: 00000000 8d8fd857 00000000 860dee80 83936540 200003c0 40946400 00000002 1e40: dfba1f14 dfba1e50 8148f62c 8148e244 00000000 8d8fd857 00000000 00000000 1e60: 8254c844 dfba1ea4 0000005f 8421af18 00000064 83936570 dfba1ee4 dfba1e88 1e80: 80807dc4 807fe47c 00000064 00000001 00000000 dfba1ea4 85ab5810 834d6220 1ea0: 00006400 0000000b dfba1e98 00000000 00000000 8d8fd857 00000000 860dee80 1ec0: 40946400 200003c0 200003c0 860dee80 00000003 8497a4c0 dfba1ef4 dfba1ee8 1ee0: 80807ef8 8d8fd857 dfba1f14 00000000 860dee81 40946400 200003c0 860dee80 1f00: 00000003 8497a4c0 dfba1fa4 dfba1f18 805bc574 8148f2e4 ecac8b10 8497a4c0 1f20: dfba1f3c dfba1f30 81b652c0 81b6518c dfba1f54 dfba1f40 8025b7a8 8028f458 1f40: dfba1fb0 40000000 dfba1f84 dfba1f58 80221bdc 8025b764 00000000 82a1eb0c 1f60: dfba1fb0 0013eb70 ecac8b10 80221b30 00000000 8d8fd857 dfba1fac 00000000 1f80: 00000000 00356310 00000036 8020029c 8497a4c0 00000036 00000000 dfba1fa8 1fa0: 80200060 805bc33c 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76ffb0dc 1fe0: 76ffae88 76ffae78 00018fa0 001309d0 60000010 00000003 00000000 00000000 Call trace: [<81496e14>] (parport_attach) from [<81492b00>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfba1d90 r6:00000000 r5:81e2e4c8 r4:82bd92a4 [<814929f8>] (comedi_device_attach) from [<8148e304>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8497a4c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:83936540 r4:200003c0 [<8148e238>] (do_devconfig_ioctl) from [<8148f62c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:83936540 r4:860dee80 [<8148f2d8>] (comedi_unlocked_ioctl) from [<805bc574>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148f2d8>] (comedi_unlocked_ioctl) from [<805bc574>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148f2d8>] (comedi_unlocked_ioctl) from [<805bc574>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148f2d8>] (comedi_unlocked_ioctl) from [<805bc574>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8497a4c0 r9:00000003 r8:860dee80 r7:200003c0 r6:40946400 r5:860dee81 r4:00000000 [<805bc330>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfba1fa8 to 0xdfba1ff0) 1fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76ffb0dc 1fe0: 76ffae88 76ffae78 00018fa0 001309d0 r10:00000036 r9:8497a4c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67b6c e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67b6c bl 0xfed9edb8 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