8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 2097 Comm: syz.2.3694 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 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 : [<8140e660>] lr : [<8140e64c>] psr: 60000013 sp : eae09cb8 ip : eae09cb8 fp : eae09cd4 r10: 00000000 r9 : 00000084 r8 : eae09da4 r7 : 00004f27 r6 : 0000009b r5 : 8452c480 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8452c480 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85dc7e40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8452c480 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8452c480 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xeae08000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xeae08000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xeae08000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.2.3694 (pid: 2097, stack limit = 0xeae08000) Stack: (0xeae09cb8 to 0xeae0a000) 9ca0: 8140e600 00004f27 9cc0: 8452c480 00004f27 eae09cf4 eae09cd8 8140e33c 8140e60c 00004f27 80516350 9ce0: 8397e000 8397e000 eae09d14 eae09cf8 8140e6f4 8140e2f0 8452c480 00000000 9d00: 8397e000 00004f27 eae09d54 eae09d18 8140e8a4 8140e678 eae09d6c 83fc6400 9d20: 828215f0 00000000 00000000 829d4c84 8452c480 00000000 eae09d90 8452c480 9d40: 00000000 82b29b30 eae09d8c eae09d58 813fd298 8140e83c 40946400 00000000 9d60: eae09d7c 20000600 8452c480 b5403587 40946400 8458d400 00000003 8452c4b0 9d80: eae09e4c eae09d90 813f8bd0 813fd198 35353238 00000000 00000000 00000000 9da0: 00000000 00004f27 00000002 00000003 0000c466 00000400 00000cc7 000000c9 9dc0: 5c952399 00000005 00001000 00000802 00001607 00000001 00000006 0000000c 9de0: 00000081 00006fd5 00000004 00000003 00000002 00000008 fffffffd 00000000 9e00: fffffff5 0000475c 00000003 00010002 00000008 00000000 08000000 00000006 9e20: 00000000 f821b714 00000000 84dec780 8452c480 20000600 40946400 8458d400 9e40: eae09f14 eae09e50 813f9750 813f8b08 eae09e4c f821b714 00000000 00000000 9e60: 824b1574 eae09ea4 0000005f 8441aa30 00000064 84559d44 eae09ee4 eae09e88 9e80: 807b43fc 807aaa78 00000064 00000001 00000000 eae09ea4 84d08250 8341c4c8 9ea0: 00006400 0000000b eae09e98 00000000 eae09d38 f821b714 00000000 84dec780 9ec0: 40946400 20000600 20000600 84dec780 00000003 8458d400 eae09ef4 eae09ee8 9ee0: 807b452c f821b714 eae09f14 00000000 84dec781 40946400 20000600 84dec780 9f00: 00000003 8458d400 eae09fa4 eae09f18 80582358 813f9658 ecac8b10 8458d400 9f20: eae09f3c eae09f30 81aa745c 81aa732c eae09f54 eae09f40 8025ba7c 8028ef68 9f40: eae09fb0 40000000 eae09f84 eae09f58 80221a54 8025ba38 00000000 8281cfbc 9f60: eae09fb0 0013ddc0 ecac8b10 802219a8 00000000 f821b714 eae09fac 00000000 9f80: 00000000 00346310 00000036 8020029c 8458d400 00000036 00000000 eae09fa8 9fa0: 80200060 80582120 00000000 00000000 00000003 40946400 20000600 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa40dc 9fe0: 76fa3e88 76fa3e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<8140e600>] (subdev_8255_io) from [<8140e33c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8452c480 r5:00004f27 r4:8140e600 [<8140e2e4>] (subdev_8255_do_config) from [<8140e6f4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8140e2e4>] (subdev_8255_do_config) from [<8140e6f4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8397e000 [<8140e66c>] (subdev_8255_io_init) from [<8140e8a4>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8140e66c>] (subdev_8255_io_init) from [<8140e8a4>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8397e000 r5:00000000 r4:8452c480 [<8140e830>] (dev_8255_attach) from [<813fd298>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b29b30 r9:00000000 r8:8452c480 r7:eae09d90 r6:00000000 r5:8452c480 r4:829d4c84 [<813fd18c>] (comedi_device_attach) from [<813f8bd0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:8452c4b0 r9:00000003 r8:8458d400 r7:40946400 r6:b5403587 r5:8452c480 r4:20000600 [<813f8afc>] (do_devconfig_ioctl) from [<813f9750>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:8458d400 r7:40946400 r6:20000600 r5:8452c480 r4:84dec780 [<813f964c>] (comedi_unlocked_ioctl) from [<80582358>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f964c>] (comedi_unlocked_ioctl) from [<80582358>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f964c>] (comedi_unlocked_ioctl) from [<80582358>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f964c>] (comedi_unlocked_ioctl) from [<80582358>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:8458d400 r9:00000003 r8:84dec780 r7:20000600 r6:40946400 r5:84dec781 r4:00000000 [<80582114>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeae09fa8 to 0xeae09ff0) 9fa0: 00000000 00000000 00000003 40946400 20000600 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fa40dc 9fe0: 76fa3e88 76fa3e78 00018734 0012fc20 r10:00000036 r9:8458d400 r8:8020029c r7:00000036 r6:00346310 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