8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read [0000000e] *pgd=8554c003, *pmd=df376003 Internal error: Oops: 205 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4629 Comm: syz.1.162 Not tainted 6.15.0-rc6-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at io_ring_buffers_peek+0x24/0x258 io_uring/kbuf.c:227 LR is at io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343 pc : [<808896b0>] lr : [<80889df4>] psr: 20000013 sp : dfa41d90 ip : dfa41dd8 fp : dfa41dd4 r10: 00000362 r9 : 00000000 r8 : 85482380 r7 : 853bfd0c r6 : 853bfd00 r5 : dfa41e14 r4 : 8547c600 r3 : 00000001 r2 : 853bfd0c r1 : dfa41e14 r0 : 8547c600 Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8549d840 DAC: 00000000 Register r0 information: slab io_kiocb start 8547c600 pointer offset 0 size 192 Register r1 information: 2-page vmalloc region starting at 0xdfa40000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r2 information: slab kmalloc-256 start 853bfd00 pointer offset 12 size 256 Register r3 information: non-paged memory Register r4 information: slab io_kiocb start 8547c600 pointer offset 0 size 192 Register r5 information: 2-page vmalloc region starting at 0xdfa40000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r6 information: slab kmalloc-256 start 853bfd00 pointer offset 0 size 256 Register r7 information: slab kmalloc-256 start 853bfd00 pointer offset 12 size 256 Register r8 information: slab kmalloc-64 start 85482380 pointer offset 0 size 64 Register r9 information: NULL pointer Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfa40000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Register r12 information: 2-page vmalloc region starting at 0xdfa40000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844 Process syz.1.162 (pid: 4629, stack limit = 0xdfa40000) Stack: (0xdfa41d90 to 0xdfa42000) 1d80: 81a4c394 8030cb14 8452d100 00000001 1da0: 00010000 853bfd0c 00000000 8547c600 dfa41e14 853bfd00 853bfd0c 00000000 1dc0: 80000001 00000362 dfa41dec dfa41dd8 80889df4 80889698 835eac80 8547c600 1de0: dfa41e54 dfa41df0 80893324 80889d98 00000000 dfa41dd8 853bfd00 e929f486 1e00: 00010001 00000001 8452d128 00000000 00000000 853bfd0c 00000000 00000000 1e20: 00010001 e929f486 dfa41e54 8547c600 81cf0ca0 00000000 00000000 00000000 1e40: 80000001 84008000 dfa41e7c dfa41e58 80882304 8089307c 8547c600 80000001 1e60: 0000001b 81cf0b5c 848b4b40 00000000 dfa41ebc dfa41e80 80886dd4 808822c4 1e80: 8547c840 8547c900 8547c9c0 81cf0ca0 8547cb40 8452d000 8547c66c 8547c600 1ea0: 856a0000 00000000 00000000 84008000 dfa41f14 dfa41ec0 808878ec 80886d98 1ec0: 8088e2a8 81a4c338 00000000 00000000 00000800 00000800 81cf0b5c 00000800 1ee0: 8452d000 e929f486 848b4900 00000000 8452d000 00003516 848b4900 00000000 1f00: 84008000 00000000 dfa41fa4 dfa41f18 80888394 808876ec ecac8b10 8452d040 1f20: 00000000 00000000 81a50110 81a4ffe0 dfa41f54 dfa41f40 8026b438 8029ce24 1f40: dfa41fb0 40000000 dfa41f84 dfa41f58 802229dc 8026b3f4 00000000 8281d05c 1f60: dfa41fb0 0014c490 ecac8b10 80222930 00000000 e929f486 dfa41fac 00000000 1f80: 00000000 002e643c 000001aa 8020029c 84008000 000001aa 00000000 dfa41fa8 1fa0: 80200060 80888268 00000000 00000000 00000005 00003516 00000000 00000000 1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76ba60bc 1fe0: 76ba5ec0 76ba5eb0 0001939c 00131f30 60000010 00000005 00000000 00000000 Call trace: [<8088968c>] (io_ring_buffers_peek) from [<80889df4>] (io_buffers_peek+0x68/0x8c io_uring/kbuf.c:343) r10:00000362 r9:80000001 r8:00000000 r7:853bfd0c r6:853bfd00 r5:dfa41e14 r4:8547c600 [<80889d8c>] (io_buffers_peek) from [<80893324>] (io_recv_buf_select io_uring/net.c:1077 [inline]) [<80889d8c>] (io_buffers_peek) from [<80893324>] (io_recv+0x2b4/0x46c io_uring/net.c:1138) r5:8547c600 r4:835eac80 [<80893070>] (io_recv) from [<80882304>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734) r10:84008000 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0 r4:8547c600 [<808822b8>] (__io_issue_sqe) from [<80886dd4>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757) r9:00000000 r8:848b4b40 r7:81cf0b5c r6:0000001b r5:80000001 r4:8547c600 [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_queue_sqe io_uring/io_uring.c:1963 [inline]) [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_submit_sqe io_uring/io_uring.c:2219 [inline]) [<80886d8c>] (io_issue_sqe) from [<808878ec>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336) r10:84008000 r9:00000000 r8:00000000 r7:856a0000 r6:8547c600 r5:8547c66c r4:8452d000 [<808876e0>] (io_submit_sqes) from [<80888394>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline]) [<808876e0>] (io_submit_sqes) from [<80888394>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330) r10:00000000 r9:84008000 r8:00000000 r7:848b4900 r6:00003516 r5:8452d000 r4:00000000 [<8088825c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa41fa8 to 0xdfa41ff0) 1fa0: 00000000 00000000 00000005 00003516 00000000 00000000 1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76ba60bc 1fe0: 76ba5ec0 76ba5eb0 0001939c 00131f30 r10:000001aa r9:84008000 r8:8020029c r7:000001aa r6:002e643c r5:00000000 r4:00000000 Code: e1a08002 e5912000 e50b2030 e1a05001 (e1d920be) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a08002 mov r8, r2 4: e5912000 ldr r2, [r1] 8: e50b2030 str r2, [fp, #-48] @ 0xffffffd0 c: e1a05001 mov r5, r1 * 10: e1d920be ldrh r2, [r9, #14] <-- trapping instruction