Hello, syzbot found the following crash on: HEAD commit: b0c3ba31 Merge tag 'fsnotify_for_v5.7-rc8' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13ebe5e2100000 kernel config: https://syzkaller.appspot.com/x/.config?x=cca7550d53ffa599 dashboard link: https://syzkaller.appspot.com/bug?extid=06f6ed6b0ea3f5d95cd1 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+06f6ed6b0ea3f5d95cd1@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc00003d1339: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000001e899c8-0x0000000001e899cf] CPU: 0 PID: 29767 Comm: syz-executor.0 Not tainted 5.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:compound_head include/linux/page-flags.h:182 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:391 [inline] RIP: 0010:free_swap_cache mm/swap_state.c:267 [inline] RIP: 0010:free_pages_and_swap_cache+0x94/0x3f0 mm/swap_state.c:295 Code: 00 00 e8 af 3c c9 ff 4c 89 e8 48 c1 e8 03 80 3c 18 00 0f 85 e8 02 00 00 4d 8b 65 00 49 8d 44 24 08 48 89 44 24 20 48 c1 e8 03 <80> 3c 18 00 0f 85 e7 02 00 00 4d 8b 7c 24 08 31 ff 4c 89 e5 4c 89 RSP: 0018:ffffc9001610f6c0 EFLAGS: 00010206 RAX: 00000000003d1339 RBX: dffffc0000000000 RCX: ffffffff81aa01e3 RDX: 0000000000000000 RSI: ffffffff81aa01f1 RDI: 0000000000000004 RBP: ffffea0001e89980 R08: ffff88803dc0a3c0 R09: fffff940003d1331 R10: ffffea0001e89987 R11: fffff940003d1330 R12: 0000000001e899c0 R13: ffff8880001a6898 R14: 0000000000000111 R15: 00000000000001fe FS: 00007f0a0e9c6700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33326000 CR3: 00000000799e0000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:242 [inline] tlb_flush_mmu+0x8d/0x610 mm/mmu_gather.c:249 zap_pte_range mm/memory.c:1158 [inline] zap_pmd_range mm/memory.c:1196 [inline] zap_pud_range mm/memory.c:1225 [inline] zap_p4d_range mm/memory.c:1246 [inline] unmap_page_range+0x198d/0x25d0 mm/memory.c:1267 unmap_single_vma+0x196/0x300 mm/memory.c:1312 unmap_vmas+0x16f/0x2f0 mm/memory.c:1344 exit_mmap+0x2aa/0x510 mm/mmap.c:3150 __mmput kernel/fork.c:1085 [inline] mmput+0x168/0x4b0 kernel/fork.c:1106 exit_mm kernel/exit.c:480 [inline] do_exit+0xa51/0x2dd0 kernel/exit.c:783 do_group_exit+0x125/0x340 kernel/exit.c:894 get_signal+0x47b/0x24e0 kernel/signal.c:2739 do_signal+0x81/0x2240 arch/x86/kernel/signal.c:784 exit_to_usermode_loop+0x26c/0x360 arch/x86/entry/common.c:161 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:279 [inline] do_syscall_64+0x6b1/0x7d0 arch/x86/entry/common.c:305 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0a0e9c5cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078bf08 RCX: 000000000045ca29 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078bf08 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c R13: 0000000000c9fb6f R14: 00007f0a0e9c69c0 R15: 000000000078bf0c Modules linked in: ---[ end trace 5b99197ed4464cc6 ]--- RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline] RIP: 0010:compound_head include/linux/page-flags.h:182 [inline] RIP: 0010:PageSwapCache include/linux/page-flags.h:391 [inline] RIP: 0010:free_swap_cache mm/swap_state.c:267 [inline] RIP: 0010:free_pages_and_swap_cache+0x94/0x3f0 mm/swap_state.c:295 Code: 00 00 e8 af 3c c9 ff 4c 89 e8 48 c1 e8 03 80 3c 18 00 0f 85 e8 02 00 00 4d 8b 65 00 49 8d 44 24 08 48 89 44 24 20 48 c1 e8 03 <80> 3c 18 00 0f 85 e7 02 00 00 4d 8b 7c 24 08 31 ff 4c 89 e5 4c 89 RSP: 0018:ffffc9001610f6c0 EFLAGS: 00010206 RAX: 00000000003d1339 RBX: dffffc0000000000 RCX: ffffffff81aa01e3 RDX: 0000000000000000 RSI: ffffffff81aa01f1 RDI: 0000000000000004 RBP: ffffea0001e89980 R08: ffff88803dc0a3c0 R09: fffff940003d1331 R10: ffffea0001e89987 R11: fffff940003d1330 R12: 0000000001e899c0 R13: ffff8880001a6898 R14: 0000000000000111 R15: 00000000000001fe FS: 00007f0a0e9c6700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021000000 CR3: 000000009d47f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. 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