Hello, syzbot found the following issue on: HEAD commit: 39676dfe5233 Add linux-next specific files for 20231222 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=172080a1e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=f3761490b734dc96 dashboard link: https://syzkaller.appspot.com/bug?extid=3eff5e51bf1db122a16e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=178f6e26e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15c399e9e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/360542c2ca67/disk-39676dfe.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/900dfb21ca8a/vmlinux-39676dfe.xz kernel image: https://storage.googleapis.com/syzbot-assets/c94a2a3ea0e0/bzImage-39676dfe.xz The issue was bisected to: commit 7bc134496bbbaacb0d4423b819da4eca850a839d Author: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx> Date: Mon Dec 18 11:50:31 2023 +0000 mm/zswap: change dstmem size to one page bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15f60c36e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17f60c36e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=13f60c36e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3eff5e51bf1db122a16e@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 7bc134496bbb ("mm/zswap: change dstmem size to one page") general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 5065 Comm: syz-executor140 Not tainted 6.7.0-rc6-next-20231222-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:63 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:83 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:72 [inline] RIP: 0010:scatterwalk_copychunks+0x3e0/0x560 crypto/scatterwalk.c:50 Code: f0 48 c1 e8 03 80 3c 08 00 0f 85 81 01 00 00 49 8d 44 24 08 4d 89 26 48 bf 00 00 00 00 00 fc ff df 48 89 44 24 10 48 c1 e8 03 <0f> b6 04 38 84 c0 74 08 3c 03 0f 8e 47 01 00 00 48 8b 44 24 08 41 RSP: 0018:ffffc90003a8ecf0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88802785d940 RSI: ffffffff8465df74 RDI: dffffc0000000000 RBP: 0000000000001000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 82d8bd1b6060f805 R12: 0000000000000000 R13: 0000000000000014 R14: ffffc90003a8ed88 R15: 0000000000001000 FS: 00005555565c5380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000d5e538 CR3: 0000000079f3a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> scatterwalk_map_and_copy+0x151/0x1d0 crypto/scatterwalk.c:67 scomp_acomp_comp_decomp+0x3a3/0x780 crypto/scompress.c:149 crypto_acomp_compress include/crypto/acompress.h:302 [inline] zswap_store+0x98b/0x2430 mm/zswap.c:1666 swap_writepage+0x8e/0x220 mm/page_io.c:198 pageout+0x399/0x9e0 mm/vmscan.c:656 shrink_folio_list+0x2f47/0x3ea0 mm/vmscan.c:1319 reclaim_folio_list+0xe4/0x3a0 mm/vmscan.c:2104 reclaim_pages+0x483/0x6a0 mm/vmscan.c:2140 madvise_cold_or_pageout_pte_range+0x129e/0x1f70 mm/madvise.c:526 walk_pmd_range mm/pagewalk.c:143 [inline] walk_pud_range mm/pagewalk.c:221 [inline] walk_p4d_range mm/pagewalk.c:256 [inline] walk_pgd_range+0xa48/0x1870 mm/pagewalk.c:293 __walk_page_range+0x630/0x770 mm/pagewalk.c:395 walk_page_range+0x626/0xa80 mm/pagewalk.c:521 madvise_pageout_page_range mm/madvise.c:585 [inline] madvise_pageout+0x32c/0x820 mm/madvise.c:612 madvise_vma_behavior+0x1cc/0x1b50 mm/madvise.c:1031 madvise_walk_vmas+0x1cf/0x2c0 mm/madvise.c:1260 do_madvise+0x333/0x660 mm/madvise.c:1440 __do_sys_madvise mm/madvise.c:1453 [inline] __se_sys_madvise mm/madvise.c:1451 [inline] __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1451 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f15a5e14b69 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffde7b4a5c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f15a5e14b69 RDX: 0000000000000015 RSI: 0000000000c00304 RDI: 0000000020000000 RBP: 0000000000000000 R08: 00005555565c6610 R09: 00005555565c6610 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffde7b4a808 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:scatterwalk_start include/crypto/scatterwalk.h:63 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:83 [inline] RIP: 0010:scatterwalk_pagedone include/crypto/scatterwalk.h:72 [inline] RIP: 0010:scatterwalk_copychunks+0x3e0/0x560 crypto/scatterwalk.c:50 Code: f0 48 c1 e8 03 80 3c 08 00 0f 85 81 01 00 00 49 8d 44 24 08 4d 89 26 48 bf 00 00 00 00 00 fc ff df 48 89 44 24 10 48 c1 e8 03 <0f> b6 04 38 84 c0 74 08 3c 03 0f 8e 47 01 00 00 48 8b 44 24 08 41 RSP: 0018:ffffc90003a8ecf0 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: dffffc0000000000 RDX: ffff88802785d940 RSI: ffffffff8465df74 RDI: dffffc0000000000 RBP: 0000000000001000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000002 R11: 82d8bd1b6060f805 R12: 0000000000000000 R13: 0000000000000014 R14: ffffc90003a8ed88 R15: 0000000000001000 FS: 00005555565c5380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000d5e538 CR3: 0000000079f3a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f0 48 c1 e8 03 lock shr $0x3,%rax 5: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 9: 0f 85 81 01 00 00 jne 0x190 f: 49 8d 44 24 08 lea 0x8(%r12),%rax 14: 4d 89 26 mov %r12,(%r14) 17: 48 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%rdi 1e: fc ff df 21: 48 89 44 24 10 mov %rax,0x10(%rsp) 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 0f b6 04 38 movzbl (%rax,%rdi,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e 47 01 00 00 jle 0x181 3a: 48 8b 44 24 08 mov 0x8(%rsp),%rax 3f: 41 rex.B --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
