8<--- cut here --- Unable to handle kernel paging request at virtual address fee00303 when write [fee00303] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 27163 Comm: syz.0.2901 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 subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<8155a8c0>] lr : [<8155a8ac>] psr: 60000013 sp : ea9b9cb8 ip : ea9b9cb8 fp : ea9b9cd4 r10: 00000300 r9 : 00000004 r8 : ea9b9da4 r7 : 00000000 r6 : 0000009b r5 : 84f0ec00 r4 : 00000303 r3 : 0000009b r2 : fee00303 r1 : 00000001 r0 : 84f0ec00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 863b8d40 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84f0ec00 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:974 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84f0ec00 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xea9b8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea9b8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Register r12 information: 2-page vmalloc region starting at 0xea9b8000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2798 Process syz.0.2901 (pid: 27163, stack limit = 0xea9b8000) Stack: (0xea9b9cb8 to 0xea9ba000) 9ca0: 8155a860 00000300 9cc0: 84f0ec00 00000000 ea9b9cf4 ea9b9cd8 8155a59c 8155a86c 00000300 805796f0 9ce0: 8749d000 8749d000 ea9b9d14 ea9b9cf8 8155a954 8155a550 84f0ec00 00000000 9d00: 8749d000 00000000 ea9b9d54 ea9b9d18 8155ab04 8155a8d8 ffffffff 00000004 9d20: 8341e340 00000000 00000000 835dfbe8 84f0ec00 00000000 ea9b9d90 84f0ec00 9d40: 00000000 83737400 ea9b9d8c ea9b9d58 815494fc 8155aa9c 40946400 00000000 9d60: ea9b9d7c 20000180 84f0ec00 b5403587 40946400 00000001 00000003 85c9f080 9d80: ea9b9e4c ea9b9d90 81544d18 81549400 35353238 00000000 00000000 00000000 9da0: 00000000 00000300 c0000000 00000002 00000400 0000000e 00800005 00000007 9dc0: 00000006 00000008 00000056 ffffffff 00000001 00000001 fffffffc 0010000b 9de0: 00000000 00000005 0004007a 00000003 20000003 00000089 00000012 0000007f 9e00: 00000000 00000005 00000e66 00000001 02000008 0000a6b3 00000000 00000005 9e20: 00000000 d5ded8e2 00000000 8715fb00 84f0ec00 20000180 40946400 00000001 9e40: ea9b9f14 ea9b9e50 81546028 81544c58 8276ba64 84e7e408 00000064 85033f3c 9e60: ea9b9ee4 ea9b9e70 8085e85c 80854bbc 00000064 84f0ec30 00000000 ea9b9e90 9e80: 00000000 84502c10 8401e2a8 40946400 0000000b 00000000 ea9b9e84 00000000 9ea0: 00000000 00000000 00000000 00000000 00000000 d5ded8e2 8035f910 8715fb00 9ec0: 40946400 20000180 20000180 8715fb00 00000003 85c9f080 ea9b9ef4 ea9b9ee8 9ee0: 8085e98c d5ded8e2 ea9b9f14 00000000 8715fb01 40946400 20000180 8715fb00 9f00: 00000003 85c9f080 ea9b9fa4 ea9b9f18 805f3d14 81545ce0 ecac8b10 85c9f080 9f20: ea9b9f3c ea9b9f30 81c11390 81c1125c ea9b9f54 ea9b9f40 8025bc8c 80291138 9f40: ea9b9fb0 40000000 ea9b9f84 ea9b9f58 80221c2c 8025bc44 00000000 8341a10c 9f60: ea9b9fb0 0013f390 ecac8b10 80221b80 00000000 d5ded8e2 ea9b9fac 00000000 9f80: 00000000 00356310 00000036 8020029c 85c9f080 00000036 00000000 ea9b9fa8 9fa0: 80200060 805f3adc 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f780dc 9fe0: 76f77e88 76f77e78 00018ff8 001311f0 60000010 00000003 00000000 00000000 Call trace: [<8155a860>] (subdev_8255_io) from [<8155a59c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84f0ec00 r5:00000300 r4:8155a860 [<8155a544>] (subdev_8255_do_config) from [<8155a954>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8155a544>] (subdev_8255_do_config) from [<8155a954>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8749d000 [<8155a8cc>] (subdev_8255_io_init) from [<8155ab04>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8155a8cc>] (subdev_8255_io_init) from [<8155ab04>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8749d000 r5:00000000 r4:84f0ec00 [<8155aa90>] (dev_8255_attach) from [<815494fc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:83737400 r9:00000000 r8:84f0ec00 r7:ea9b9d90 r6:00000000 r5:84f0ec00 r4:835dfbe8 [<815493f4>] (comedi_device_attach) from [<81544d18>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:931) r10:85c9f080 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:84f0ec00 r4:20000180 [<81544c4c>] (do_devconfig_ioctl) from [<81546028>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2303) r8:00000001 r7:40946400 r6:20000180 r5:84f0ec00 r4:8715fb00 [<81545cd4>] (comedi_unlocked_ioctl) from [<805f3d14>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81545cd4>] (comedi_unlocked_ioctl) from [<805f3d14>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81545cd4>] (comedi_unlocked_ioctl) from [<805f3d14>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81545cd4>] (comedi_unlocked_ioctl) from [<805f3d14>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85c9f080 r9:00000003 r8:8715fb00 r7:20000180 r6:40946400 r5:8715fb01 r4:00000000 [<805f3ad0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea9b9fa8 to 0xea9b9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f780dc 9fe0: 76f77e88 76f77e78 00018ff8 001311f0 r10:00000036 r9:85c9f080 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction