8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f00 when write [fee02f00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 10952 Comm: syz.7.1455 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 : [<814a0758>] lr : [<814a074c>] psr: 60000013 sp : dffd1d30 ip : dffd1d30 fp : dffd1d54 r10: 82d32f9c r9 : 00000003 r8 : 8315b6c0 r7 : dffd1d90 r6 : dffd1d90 r5 : 8315b6c0 r4 : 00000000 r3 : fee02f00 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86009800 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 8315b6c0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdffd0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r7 information: 2-page vmalloc region starting at 0xdffd0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r8 information: slab kmalloc-192 start 8315b6c0 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 0xdffd0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Register r12 information: 2-page vmalloc region starting at 0xdffd0000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2766 Process syz.7.1455 (pid: 10952, stack limit = 0xdffd0000) Stack: (0xdffd1d30 to 0xdffd2000) 1d20: ffffffff 00000004 82bda4a4 81e2e9e8 1d40: 00000000 dffd1d90 dffd1d8c dffd1d58 8149c3e8 814a0708 40946400 00000000 1d60: dffd1d7c 20000300 8315b6c0 b5403587 40946400 00000001 00000003 84734980 1d80: dffd1e4c dffd1d90 81497bec 8149c2ec 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00002f00 00000005 0000d09a ffffdfff 00000003 fffffffe 20000004 1dc0: 00000003 00000ffe 7ffffffe 0000000c 00000002 00000004 00000008 0000ffff 1de0: 00000006 00000005 000007ff 00000830 00000008 00010000 00000009 00000800 1e00: 00000100 00000002 00000001 00000007 00000003 00000004 00000005 0000070f 1e20: 00000000 5ad1c97b 00000000 84de1400 8315b6c0 20000300 40946400 00000001 1e40: dffd1f14 dffd1e50 81498f14 81497b2c 00000000 5ad1c97b 00000000 00000000 1e60: 8254e844 dffd1ea4 0000005f 84468d40 00000064 8315b6f0 dffd1ee4 dffd1e88 1e80: 8080b76c 80801e24 00000064 00000001 00000000 dffd1ea4 83e6d610 834ea198 1ea0: 00006400 0000000b dffd1e98 00000000 00000000 5ad1c97b 00000000 84de1400 1ec0: 40946400 20000300 20000300 84de1400 00000003 84734980 dffd1ef4 dffd1ee8 1ee0: 8080b8a0 5ad1c97b dffd1f14 00000000 84de1401 40946400 20000300 84de1400 1f00: 00000003 84734980 dffd1fa4 dffd1f18 805bdf78 81498bcc ecac8b10 84734980 1f20: dffd1f3c dffd1f30 81b6ec00 81b6eacc dffd1f54 dffd1f40 8025b878 8028f548 1f40: dffd1fb0 40000000 dffd1f84 dffd1f58 80221bdc 8025b834 00000000 82a1eb0c 1f60: dffd1fb0 0013ebf0 ecac8b10 80221b30 00000000 5ad1c97b dffd1fac 00000000 1f80: 00000000 00356310 00000036 8020029c 84734980 00000036 00000000 dffd1fa8 1fa0: 80200060 805bdd40 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fe10dc 1fe0: 76fe0e88 76fe0e78 00018fa0 00130a50 60000010 00000003 00000000 00000000 Call trace: [<814a06fc>] (parport_attach) from [<8149c3e8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dffd1d90 r6:00000000 r5:81e2e9e8 r4:82bda4a4 [<8149c2e0>] (comedi_device_attach) from [<81497bec>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84734980 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:8315b6c0 r4:20000300 [<81497b20>] (do_devconfig_ioctl) from [<81498f14>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000300 r5:8315b6c0 r4:84de1400 [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81498bc0>] (comedi_unlocked_ioctl) from [<805bdf78>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84734980 r9:00000003 r8:84de1400 r7:20000300 r6:40946400 r5:84de1401 r4:00000000 [<805bdd34>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdffd1fa8 to 0xdffd1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000300 00000000 1fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fe10dc 1fe0: 76fe0e88 76fe0e78 00018fa0 00130a50 r10:00000036 r9:84734980 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb6552a e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb6552a bl 0xfed954b0 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