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: 13522 Comm: syz.8.2067 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 : [<81454124>] lr : [<81454110>] psr: 60000013 sp : dfad1cb8 ip : dfad1cb8 fp : dfad1cd4 r10: 00000000 r9 : 00000084 r8 : dfad1da4 r7 : 00004f27 r6 : 0000009b r5 : 847123c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 847123c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8e7cee40 DAC: 00000000 Register r0 information: slab kmalloc-192 start 847123c0 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:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 847123c0 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 0xdfad0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfad0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Register r12 information: 2-page vmalloc region starting at 0xdfad0000 allocated at kernel_clone+0xbc/0x438 kernel/fork.c:2723 Process syz.8.2067 (pid: 13522, stack limit = 0xdfad0000) Stack: (0xdfad1cb8 to 0xdfad2000) 1ca0: 814540c4 00004f27 1cc0: 847123c0 00004f27 dfad1cf4 dfad1cd8 81453e00 814540d0 00004f27 8052b5dc 1ce0: 85554000 85554000 dfad1d14 dfad1cf8 814541b8 81453db4 847123c0 00000000 1d00: 85554000 00004f27 dfad1d54 dfad1d18 81454368 8145413c 82cfc1e0 84c63c80 1d20: 82a20540 00000000 00000000 82bd2c5c 847123c0 00000000 dfad1d90 847123c0 1d40: 00000000 82d2bd34 dfad1d8c dfad1d58 81442cb0 81454300 40946400 00000000 1d60: dfad1d7c 200000c0 847123c0 b5403587 40946400 00000003 00000003 8f59ee40 1d80: dfad1e4c dfad1d90 8143e4c8 81442bb4 35353238 00000000 00000000 00000000 1da0: 00000000 00004f27 00000005 00010000 0000007f 00000008 fffffbf8 40000007 1dc0: 40080000 00800003 00100100 00000000 00000005 00000003 00000056 00000402 1de0: 00000002 00000008 00000000 00000003 40000003 00000089 ffffffff 00000002 1e00: 20001e52 0400000b 00000fff 0200003a 7fffffff 00000007 00000002 00000c6b 1e20: 00000000 e0e7155c 00000000 84f88980 847123c0 200000c0 40946400 00000003 1e40: dfad1f14 dfad1e50 8143f7ec 8143e400 00000000 e0e7155c 00000000 00000000 1e60: 8252c804 dfad1ea4 0000005f 84283dd8 00000064 847123f0 dfad1ee4 dfad1e88 1e80: 807dcbb4 807d2ee4 00000064 00000001 00000000 dfad1ea4 8606c190 83426220 1ea0: 00006400 0000000b dfad1e98 00000000 00000000 e0e7155c 00000000 84f88980 1ec0: 40946400 200000c0 200000c0 84f88980 00000003 8f59ee40 dfad1ef4 dfad1ee8 1ee0: 807dcce8 e0e7155c dfad1f14 00000000 84f88981 40946400 200000c0 84f88980 1f00: 00000003 8f59ee40 dfad1fa4 dfad1f18 8059a224 8143f4a4 ecac8b10 8f59ee40 1f20: dfad1f3c dfad1f30 81afe874 81afe740 dfad1f54 dfad1f40 8025a4dc 8028c2bc 1f40: dfad1fb0 40000000 dfad1f84 dfad1f58 80220be0 8025a498 00000000 82a1c27c 1f60: dfad1fb0 0013e4a0 ecac8b10 80220b34 00000000 e0e7155c dfad1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8f59ee40 00000036 00000000 dfad1fa8 1fa0: 80200060 80599fec 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1a0dc 1fe0: 76f19e88 76f19e78 00018bc4 00130300 60000010 00000003 00000000 00000000 Call trace: [<814540c4>] (subdev_8255_io) from [<81453e00>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:847123c0 r5:00004f27 r4:814540c4 [<81453da8>] (subdev_8255_do_config) from [<814541b8>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81453da8>] (subdev_8255_do_config) from [<814541b8>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85554000 [<81454130>] (subdev_8255_io_init) from [<81454368>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81454130>] (subdev_8255_io_init) from [<81454368>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:85554000 r5:00000000 r4:847123c0 [<814542f4>] (dev_8255_attach) from [<81442cb0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1077) r10:82d2bd34 r9:00000000 r8:847123c0 r7:dfad1d90 r6:00000000 r5:847123c0 r4:82bd2c5c [<81442ba8>] (comedi_device_attach) from [<8143e4c8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:8f59ee40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:847123c0 r4:200000c0 [<8143e3f4>] (do_devconfig_ioctl) from [<8143f7ec>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:847123c0 r4:84f88980 [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8143f498>] (comedi_unlocked_ioctl) from [<8059a224>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8f59ee40 r9:00000003 r8:84f88980 r7:200000c0 r6:40946400 r5:84f88981 r4:00000000 [<80599fe0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfad1fa8 to 0xdfad1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1a0dc 1fe0: 76f19e88 76f19e78 00018bc4 00130300 r10:00000036 r9:8f59ee40 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